https://ubuntu.com/security/notices/rss.xmlRecent content on Ubuntu security notices2026 Canonical Ltd. Ubuntu and Canonical are registered trademarks of Canonical Ltd.http://www.rssboard.org/rss-specificationFeedgenWed, 10 Jun 2026 16:24:22 +0000https://ubuntu.com/security/notices/USN-6455-2USN-6455-1 fixed vulnerabilities in Exim. The fix for CVE-2023-42117 introduced a regression on Ubuntu 22.04 LTS that resulted in certain connections logging a Taint mismatch error. This update fixes the problem. We apologize for the inconvenience. Original advisory details: It was discovered that Exim incorrectly handled validation of user-supplied data, which could lead to memory corruption. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2023-42117) It was discovered that Exim incorrectly handled validation of user-supplied data, which could lead to an out-of-bounds read. An attacker could possibly use this issue to expose sensitive information. (CVE-2023-42119) https://ubuntu.com/security/notices/USN-6455-2Wed, 10 Jun 2026 12:22:10 +0000https://ubuntu.com/security/notices/USN-8130-3USN-8130-1 fixed a vulnerability in GStreamer Base Plugins. This update provides the corresponding update for Ubuntu 16.04 LTS. Original advisory details: It was discovered that GStreamer Base Plugins incorrectly handled certain AVI media files. A remote attacker could use this issue to cause GStreamer Base Plugins to crash, resulting in a denial of service, or possibly execute arbitrary code.https://ubuntu.com/security/notices/USN-8130-3Wed, 10 Jun 2026 11:30:13 +0000https://ubuntu.com/security/notices/USN-8417-1It was discovered that Tomcat did not properly limit the size of WebDAV LOCK and PROPFIND request bodies. A remote attacker could use this issue to cause Tomcat to consume excessive memory, resulting in a denial of service. (CVE-2026-41284) It was discovered that Tomcat incorrectly validated HTTP/2 header fields. A remote attacker could use this issue to cause Tomcat to crash or possibly execute arbitrary code. (CVE-2026-41293) It was discovered that Tomcat did not properly clear HTTP authentication headers during WebSocket connection upgrades and redirects. A remote attacker could use this issue to obtain sensitive credentials. (CVE-2026-42498) It was discovered that Tomcat incorrectly handled digest authentication. A remote attacker could possibly use this issue to bypass authentication restrictions. (CVE-2026-43512) It was discovered that Tomcat incorrectly handled case sensitivity in LockOutRealm. A remote attacker could possibly use this issue to bypass account lockout protections and obtain sensitive information. (CVE-2026-43513) It was discovered that Tomcat incorrectly handled authorization when multiple method constraints defined the same HTTP method. A remote attacker could possibly use this issue to bypass authorization restrictions. (CVE-2026-43515)https://ubuntu.com/security/notices/USN-8417-1Wed, 10 Jun 2026 06:44:15 +0000https://ubuntu.com/security/notices/USN-8414-2USN-8414-1 fixed several vulnerabilities in OpenSSL. This update provides the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. Original advisory details: Frank Buss discovered that OpenSSL had a heap buffer over-read in ASN.1 content parsing. An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service, or obtain sensitive information. (CVE-2026-34180) Asim Viladi Oglu Manizada and Alex Gaynor discovered that OpenSSL could accept forged CMS AuthEnvelopedData messages. An attacker could possibly use this issue to bypass message authentication checks. (CVE-2026-34182) Mayank Jangid, Kushal Khemka, Hari Priandana, Bhabani Sankar Das, and Qifan Zhang discovered that OpenSSL had a possible NULL dereference in password- based CMS decryption. An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-42766) Zhanpeng Liu, Guannan Wang, and Guancheng Li discovered that OpenSSL had a NULL pointer dereference in CRMF EncryptedValue decryption. An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-42767) Thai Duong discovered that OpenSSL had a heap use-after-free in PKCS7_verify(). An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-45447) Zehua Qiao and Jinwen He discovered that OpenSSL had a possible heap buffer overflow in ASN.1 multibyte string conversion. An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-7383) Bhabani Sankar Das discovered that OpenSSL had an out-of-bounds read in CMS password-based decryption. An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-9076)https://ubuntu.com/security/notices/USN-8414-2Tue, 09 Jun 2026 18:29:37 +0000https://ubuntu.com/security/notices/USN-8416-1It was discovered that Go Networking incorrectly handled certain Punycode-encoded labels in the idna package. An attacker could possibly use this issue to bypass hostname-based access restrictions.https://ubuntu.com/security/notices/USN-8416-1Tue, 09 Jun 2026 18:01:10 +0000https://ubuntu.com/security/notices/USN-8415-1It was discovered that Vim incorrectly handled marked filenames in the netrw plugin. An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-43961) It was discovered that Vim incorrectly handled filenames when decompressing certain archives. An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-46483)https://ubuntu.com/security/notices/USN-8415-1Tue, 09 Jun 2026 17:28:10 +0000https://ubuntu.com/security/notices/USN-8414-1Frank Buss discovered that OpenSSL had a heap buffer over-read in ASN.1 content parsing. An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service, or obtain sensitive information. (CVE-2026-34180) Pavol Zacik and Alex Gaynor discovered that OpenSSL incorrectly accepted PKCS#12 files with short HMAC keys when using PBMAC1. An attacker could possibly use this issue to bypass integrity checks. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-34181) Asim Viladi Oglu Manizada and Alex Gaynor discovered that OpenSSL could accept forged CMS AuthEnvelopedData messages. An attacker could possibly use this issue to bypass message authentication checks. (CVE-2026-34182) Abhinav Agarwal discovered that OpenSSL had unbounded memory growth in the QUIC PATH_CHALLENGE handler. A remote attacker could possibly use this issue to cause OpenSSL to use excessive resources, leading to a denial of service. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-34183) Sunwoo Lee, Hyuk Lim, and Seunghyun Yoon discovered that OpenSSL had a NULL pointer dereference in QUIC server initial packet handling. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-42764) Mayank Jangid, Kushal Khemka, Hari Priandana, Bhabani Sankar Das, and Qifan Zhang discovered that OpenSSL had a possible NULL dereference in password- based CMS decryption. An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-42766) Zhanpeng Liu, Guannan Wang, and Guancheng Li discovered that OpenSSL had a NULL pointer dereference in CRMF EncryptedValue decryption. An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-42767) Alex Gaynor discovered that OpenSSL had a Bleichenbacher oracle in CMS_decrypt() and PKCS7_decrypt() with multiple RecipientInfo values. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-42768) Alex Gaynor discovered that OpenSSL had a trust-anchor substitution issue in CMP rootCaKeyUpdate processing. An attacker could possibly use this issue to bypass certificate trust validation. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-42769) Alex Gaynor discovered that OpenSSL used attacker-supplied parameters when validating FFC-DH peers. An attacker could possibly use this issue to weaken key validation and compromise security guarantees. (CVE-2026-42770) Alex Gaynor discovered that OpenSSL could ignore the IV in AES-OCB mode on the EVP_Cipher() path. An attacker could possibly use this issue to bypass cryptographic protections and obtain sensitive information. (CVE-2026-45445) Alex Gaynor discovered that OpenSSL had incorrect tag processing for empty messages in AES-GCM-SIV and AES-SIV modes. An attacker could possibly use this issue to bypass cryptographic integrity checks. (CVE-2026-45446) Thai Duong discovered that OpenSSL had a heap use-after-free in PKCS7_verify(). An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-45447) Zehua Qiao and Jinwen He discovered that OpenSSL had a possible heap buffer overflow in ASN.1 multibyte string conversion. An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-7383) Bhabani Sankar Das discovered that OpenSSL had an out-of-bounds read in CMS password-based decryption. An attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-9076)https://ubuntu.com/security/notices/USN-8414-1Tue, 09 Jun 2026 17:14:22 +0000https://ubuntu.com/security/notices/USN-8409-1It was discovered that uriparser incorrectly handled certain URI strings. An attacker could possibly use this issue to cause uriparser to crash, resulting in a denial of service.https://ubuntu.com/security/notices/USN-8409-1Tue, 09 Jun 2026 16:29:48 +0000https://ubuntu.com/security/notices/USN-8156-2USN-8156-1 fixed a vulnerability in GDK-PixBuf. This update provides the corresponding update for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. Original advisory details: It was discovered that GDK-PixBuf incorrectly handled certain JPEG files. An attacker could use this issue to cause GDK-PixBuf to crash, resulting in a denial of service, or possibly execute arbitrary code.https://ubuntu.com/security/notices/USN-8156-2Tue, 09 Jun 2026 16:27:37 +0000https://ubuntu.com/security/notices/USN-8412-1Felipe Franciosi, Raphael Norwitz, and Peter Turschmid discovered that the iSCSI block driver in QEMU incorrectly handled certain responses from an iSCSI server. A remote attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-1711) It was discovered that the iSCSI block driver in QEMU incorrectly handled certain memory operations, leading to a heap-based buffer over-read. An attacker could possibly use this issue to expose sensitive information from the host. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-11947) Ziming Zhang discovered that the SM501 display driver in QEMU contained an integer overflow. A local attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-12829) Gaoning Pan and Xingwei Li discovered that the USB xHCI controller implementation in QEMU contained an infinite loop. An attacker inside the guest could possibly use this issue to cause QEMU to hang, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2020-14394) Lei Sun discovered that QEMU incorrectly handled certain MemoryRegionOps objects, leading to a NULL pointer dereference. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2020-15469) Alexander Bulekov discovered that the e1000e network device implementation in QEMU contained a use-after-free. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-15859) Ziming Zhang discovered that the XGMAC Ethernet controller in QEMU contained a buffer overflow. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-15863) Alexander Bulekov discovered that the SDHCI device emulation in QEMU contained a heap-based buffer overflow. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-17380) Sergej Schumilo, Cornelius Aschermann, and Simon Wörner discovered that the USB xHCI controller implementation in QEMU did not check a return value, leading to a use-after-free. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-25084) Gaoning Pan, Yongkang Jia, and Yi Ren discovered that the USB OHCI controller implementation in QEMU contained a stack-based buffer over-read. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-25624) It was discovered that the USB OHCI controller implementation in QEMU contained an infinite loop. An attacker inside the guest could possibly use this issue to cause QEMU to consume resources, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-25625) Cheolwoo Myung discovered that the USB EHCI emulation in QEMU did not handle DMA memory map failures, leading to a reachable assertion. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-25723) Gaoning Pan discovered that the network device emulation in QEMU could be made to trigger an assertion failure when processing packets that lacked a valid layer 3 protocol. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-27617) Wenxiang Qian discovered that the ATAPI emulation in QEMU did not properly validate a buffer index, leading to an out-of-bounds read. An attacker inside the guest could possibly use this issue to expose sensitive information or cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-29443) Cheolwoo Myung discovered that the ESP SCSI emulation in QEMU contained a NULL pointer dereference. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2020-35504) Cheolwoo Myung discovered that the am53c974 SCSI host bus adapter emulation in QEMU contained a NULL pointer dereference. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2020-35505) It was discovered that the SDHCI controller emulation in QEMU contained out-of-bounds read and write issues. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2021-3409) It was discovered that several network device emulations in QEMU contained an infinite loop when operating in loopback mode. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2021-3416) Alexander Bulekov discovered that the floppy disk emulation in QEMU contained a heap-based buffer overflow. An attacker inside the guest could possibly use this issue to expose sensitive information or cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2021-3507) Remy Noel discovered that the USB redirector device emulation in QEMU performed an unbounded stack allocation when combining USB packets. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2021-3527) It was discovered that the QXL display device emulation in QEMU contained an integer overflow, leading to a heap-based buffer overflow. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2021-4206) It was discovered that the QXL display device emulation in QEMU performed a double fetch of guest-controlled values, leading to a heap-based buffer overflow. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2021-4207) It was discovered that the 9pfs server implementation in QEMU contained a race condition, leading to a use-after-free. A malicious 9p client could possibly use this issue to escalate privileges. This issue only affected Ubuntu 14.04 LTS. (CVE-2021-20181) Gaoning Pan discovered that the floppy disk emulation in QEMU contained a NULL pointer dereference. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2021-20196) Gaoning Pan discovered that the vmxnet3 network device emulation in QEMU contained an integer overflow. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2021-20203) It was discovered that the ARM Generic Interrupt Controller emulation in QEMU contained an out-of-bounds heap access. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2021-20221) Alexander Bulekov, Cheolwoo Myung, Sergej Schumilo, Cornelius Aschermann, and Simon Wörner discovered that the e1000 network device emulation in QEMU contained an infinite loop. An attacker inside the guest could possibly use this issue to cause QEMU to consume resources, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2021-20257) It was discovered that the 9p passthrough file system implementation in QEMU did not prevent opening special files on the host. A malicious guest could possibly use this issue to escape the exported 9p tree. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2023-2861) It was discovered that the virtio crypto device emulation in QEMU did not properly validate certain buffer lengths, leading to a heap buffer overflow. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2023-3180) It was discovered that the built-in VNC server in QEMU contained a NULL pointer dereference when cleaning up a connection that failed during the handshake. A remote attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS. (CVE-2023-3354) It was discovered that QEMU could incorrectly direct a guest I/O operation to disk offset 0 instead of the intended offset. An attacker inside the guest could possibly use this issue to read or overwrite sensitive data, potentially gaining control of the host. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2023-5088) It was discovered that several virtio device emulations in QEMU did not properly guard against DMA reentrancy, leading to a double free. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2024-3446) It was discovered that the SDHCI device emulation in QEMU contained a heap- based buffer overflow. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2024-3447) It was discovered that the QEMU disk image utility (qemu-img) did not properly handle certain crafted image files. An attacker could possibly use this issue to cause qemu-img to consume excessive resources or access an unintended external file, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2024-4467) Cyrille Chatras discovered that the LSI53C895A SCSI Host Bus Adapter emulation in QEMU contained a use-after-free. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2024-6519) It was discovered that the NBD server in QEMU contained an improper synchronization issue during socket closure. A remote attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2024-7409) It was discovered that the USB emulation in QEMU contained a reachable assertion. An attacker inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2024-8354) It was discovered that QEMU incorrectly handled resources during the VNC WebSocket handshake, leading to a use-after-free. A remote attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2025-11234) It was discovered that QEMU could be made to read out of bounds when reading VMDK images. An attacker could possibly use this issue to expose sensitive information or cause QEMU to crash, resulting in a denial of service. (CVE-2026-2243)https://ubuntu.com/security/notices/USN-8412-1Tue, 09 Jun 2026 16:22:49 +0000