Ubuntu Security Advisories

Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered that the Linux kernel contained insufficient branch predictor isolation between a guest and a userspace hypervisor for certain processors. This flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this to expose sensitive information from the host OS. (CVE-2025-40300) Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - HSI subsystem; - Bluetooth subsystem; - Timer subsystem; (CVE-2025-37838, CVE-2025-38118, CVE-2025-38352)

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Cryptographic API; - ACPI drivers; - Hardware monitoring drivers; - InfiniBand drivers; - Mailbox framework; - Network drivers; - AFS file system; - Ceph distributed file system; - Network file system (NFS) server daemon; - NILFS2 file system; - File systems infrastructure; - KVM subsystem; - L3 Master device support module; - Tracing infrastructure; - Memory management; - Appletalk network protocol; - Netfilter; - Open vSwitch; (CVE-2021-47385, CVE-2022-49026, CVE-2022-49390, CVE-2024-49935, CVE-2024-49963, CVE-2024-50067, CVE-2024-50095, CVE-2024-50179, CVE-2024-53090, CVE-2024-53112, CVE-2024-53217, CVE-2024-58083, CVE-2025-21715, CVE-2025-21722, CVE-2025-21761, CVE-2025-21791, CVE-2025-21811, CVE-2025-21855, CVE-2025-37958, CVE-2025-38666, CVE-2025-39964, CVE-2025-40018)

Jelte Fennema-Nio discovered that the PostgreSQL CREATE STATISTICS command did not correctly check for schema CREATE privileges. An authenticated attacker could possibly use this issue to create a denial of service against other CREATE STATISTICS users. (CVE-2025-12817) Aleksey Solovev discovered that the PostgreSQL libpq client library incorrectly handled certain memory operations. A remote attacker could possibly use this issue to cause libpq to crash, resulting in a denial of service. (CVE-2025-12818)

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Cryptographic API; - ACPI drivers; - Hardware monitoring drivers; - InfiniBand drivers; - Mailbox framework; - Network drivers; - AFS file system; - Ceph distributed file system; - Network file system (NFS) server daemon; - NILFS2 file system; - File systems infrastructure; - KVM subsystem; - L3 Master device support module; - Tracing infrastructure; - Memory management; - Appletalk network protocol; - Netfilter; - Open vSwitch; (CVE-2021-47385, CVE-2022-49026, CVE-2022-49390, CVE-2024-49935, CVE-2024-49963, CVE-2024-50067, CVE-2024-50095, CVE-2024-50179, CVE-2024-53090, CVE-2024-53112, CVE-2024-53217, CVE-2024-58083, CVE-2025-21715, CVE-2025-21722, CVE-2025-21761, CVE-2025-21791, CVE-2025-21811, CVE-2025-21855, CVE-2025-37958, CVE-2025-38666, CVE-2025-39964, CVE-2025-40018)

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - x86 architecture; - Cryptographic API; - Android drivers; - TTY drivers; - F2FS file system; - 9P file system network protocol; (CVE-2025-40025, CVE-2025-40026, CVE-2025-40027, CVE-2025-40028, CVE-2025-40108, CVE-2025-40109)

It was discovered that KDE Connect incorrectly handled device IDs. An attacker could possibly use this issue to bypass authentication and connect an unpaired device.

Piotr Kajda discovered that Ghostscript incorrectly handled writing certain files. An attacker could possibly use this issue to cause Ghostscript to crash, resulting in a denial of service.

It was discovered that Django incorrectly handled certain characters in the FilteredRelation object. An attacker could possibly use this issue to execute arbitrary SQL commands. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 25.04, and Ubuntu 25.10. (CVE-2025-13372) Seokchan Yoon discovered that Django inefficiently handled deserialization of XML objects. An attacker could possibly use this issue to cause Django to use excessive resources, causing a denial of service. (CVE-2025-64460)

USN-7855-1 fixed vulnerabilities in Unbound. It was discovered that the fix for CVE-2025-11411 was incomplete. This update fixes the problem. Original advisory details: Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin Duan discovered that Unbound incorrectly handled certain promiscuous NS RRSets. A remote attacker could possibly use this issue to perform a domain hijack attack.

Jinfeng Guo discovered that the Security component of CRaC JDK 25 did not correctly handle certain representations of encoded strings. An unauthenticated remote attacker could possibly use this issue to modify files or leak sensitive information. (CVE-2025-53057) Darius Bohni discovered that the JAXP component of CRaC JDK 25 was vulnerable to a XML External Entity (XEE) attack. An unauthenticated remote attacker could possibly use this issue to modify files or leak sensitive information. (CVE-2025-53066) Yakov Shafranovich discovered that the Libraries component of CRaC JDK 25 contained an issue where certain Strings built with StringBuilder returned an incorrect result for String.equals() checks. An unauthenticated remote attacker could possibly use this issue to update, insert, or delete accessible data. (CVE-2025-61748) In addition to security fixes, the updated packages contain bug fixes, new features, and possibly incompatible changes. Please see the following for more information: https://openjdk.org/groups/vulnerability/advisories/2025-10-21

Jinfeng Guo discovered that the Security component of CRaC JDK 21 did not correctly handle certain representations of encoded strings. An unauthenticated remote attacker could possibly use this issue to modify files or leak sensitive information. (CVE-2025-53057) Darius Bohni discovered that the JAXP component of CRaC JDK 21 was vulnerable to a XML External Entity (XEE) attack. An unauthenticated remote attacker could possibly use this issue to modify files or leak sensitive information. (CVE-2025-53066) Yakov Shafranovich discovered that the Libraries component of CRaC JDK 21 contained an issue where certain Strings built with StringBuilder returned an incorrect result for String.equals() checks. An unauthenticated remote attacker could possibly use this issue to update, insert, or delete accessible data. (CVE-2025-61748) In addition to security fixes, the updated packages contain bug fixes, new features, and possibly incompatible changes. Please see the following for more information: https://openjdk.org/groups/vulnerability/advisories/2025-10-21

Jinfeng Guo discovered that the Security component of CRaC JDK 17 did not correctly handle certain representations of encoded strings. An unauthenticated remote attacker could possibly use this issue to modify files or leak sensitive information. (CVE-2025-53057) Darius Bohni discovered that the JAXP component of CRaC JDK 17 was vulnerable to a XML External Entity (XEE) attack. An unauthenticated remote attacker could possibly use this issue to modify files or leak sensitive information. (CVE-2025-53066) In addition to security fixes, the updated packages contain bug fixes, new features, and possibly incompatible changes. Please see the following for more information: https://openjdk.org/groups/vulnerability/advisories/2025-10-21

It was discovered that GNU binutils could be forced to perform an out- of-bounds read in certain instances. An attacker with local access to a system could possibly use this issue to cause a denial of service. (CVE-2025-11839, CVE-2025-11840) It was discovered that GNU binutils incorrectly handled certain inputs. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2025-8225) It was discovered that GNU binutils incorrectly handled certain inputs. An attacker could possibly use this issue to cause a crash or execute arbitrary code. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2025-5244, CVE-2025-5245) It was discovered that GNU binutils incorrectly handled certain inputs. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2025-3198) It was discovered that GNU binutils incorrectly handled certain files. An attacker could possibly use this issue to cause a crash. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2025-1182) It was discovered that ld in GNU binutils incorrectly handled certain files. An attacker could possibly use this issue to cause a crash, expose sensitive information or execute arbitrary code. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2025-1181) It was discovered that GNU binutils incorrectly handled certain inputs. An attacker could possibly use this issue to cause a crash, expose sensitive information or execute arbitrary code. This issue only affected Ubuntu 25.04. (CVE-2025-1153) It was discovered that GNU binutils incorrectly handled certain inputs. An attacker could possibly use this issue to cause a crash or execute arbitrary code. This issue only affected Ubuntu 14.04 LTS. (CVE-2025-0840)

USN-7894-1 fixed vulnerabilities in EDK II. The update introduced a regression in the UEFI network boot. This update reverts the corresponding fixes for CVE-2023-45236 and CVE-2023-45237 pending further investigation. We apologize for the inconvenience. Original advisory details: It was discovered that EDK II was susceptible to a predictable TCP Initial Sequence Number. An attacker could possibly use this issue to gain unauthorized access. This issue only affected Ubuntu 22.04 LTS, and Ubuntu 24.04 LTS. (CVE-2023-45236, CVE-2023-45237) It was discovered that EDK II incorrectly handled S3 sleep. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 22.04 LTS, and Ubuntu 24.04 LTS. (CVE-2024-1298) It was discovered that the EDK II PE/COFF loader incorrectly handled certain memory operations. An attacker could possibly use this issue to cause a denial of service, obtain sensitive information, or execute arbitrary code. This issue only affected Ubuntu 22.04 LTS, and Ubuntu 24.04 LTS. (CVE-2024-38796) It was discovered that the EDK II PE image hashing function incorrectly handled certain memory operations. An attacker could possibly use this issue to cause a denial of service, or execute arbitrary code. (CVE-2024-38797) It was discovered that the EDK II BIOS incorrectly handled certain memory operations. An attacker could possibly use this issue to cause a denial of service. (CVE-2024-38805, CVE-2025-2295) It was discovered that EDK II incorrectly handled the enabling of MCE. An attacker could possibly use this issue to cause a denial of service, or execute arbitrary code. (CVE-2025-3770) It was discovered that the OpenSSL library embedded in EDK II contained multiple vulnerabilties. An attacker could possibly use these issues to cause a denial of service, obtain sensitive information, or execute arbitrary code. (CVE-2021-3712, CVE-2022-0778, CVE-2022-4304, CVE-2022-4450, CVE-2023-0215, CVE-2023-0286, CVE-2023-0464, CVE-2023-0465, CVE-2023-0466, CVE-2023-2650, CVE-2023-3446, CVE-2023-3817, CVE-2023-5678, CVE-2023-6237, CVE-2024-0727, CVE-2024-13176, CVE-2024-2511, CVE-2024-41996, CVE-2024-4741, CVE-2024-5535, CVE-2024-6119, CVE-2024-9143, CVE-2025-9232)

Joshua Rogers discovered that OpenVPN incorrectly handled HMAC verification checks. A remote attacker could possibly use this issue to bypass source IP address validation.

It was discovered that CUPS incorrectly handled input from users in the web configuration settings. An attacker could use this issue to insert malicious configuration options, causing a denial of service or possibly executing arbitrary code.

It was discovered that the libxml2 Python bindings incorrectly handled certain return values. An attacker could possibly use this issue to cause libxml2 to crash, resulting in a denial of service. (CVE-2025-32414) It was discovered that libxml2 incorrectly handled certain memory operations. A remote attacker could possibly use this issue to cause libxml2 to crash, resulting in a denial of service. (CVE-2025-32415) It was discovered that libxslt, used by libxml2, incorrectly handled certain attributes. An attacker could use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code. This update adds a fix to libxml2 to mitigate the libxslt vulnerability. (CVE-2025-7425)

USN-7582-1 fixed a vulnerability in libxml2. This update provides the corresponding fix for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. Original advisory details: It was discovered that libxslt, used by libxml2, incorrectly handled certain attributes. An attacker could use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code. This update adds a fix to libxml2 to mitigate the libxslt vulnerability.

Several security issues were discovered in the WebKitGTK Web and JavaScript engines. If a user were tricked into viewing a malicious website, a remote attacker could exploit a variety of issues related to web browser security, including cross-site scripting attacks, denial of service attacks, and arbitrary code execution.

USN-7886-1 fixed vulnerabilities in Python. This update provides the corresponding updates for python3.13 in Ubuntu 25.04 and Ubuntu 25.10. Original advisory details: It was discovered that Python inefficiently handled expanding system environment variables. An attacker could possibly use this issue to cause Python to consume excessive resources, leading to a denial of service. (CVE-2025-6075) Caleb Brown discovered that Python incorrectly handled the ZIP64 End of Central Directory (EOCD) Locator record offset value. An attacker could possibly use this issue to obfuscate malicious content. (CVE-2025-8291)