{"id":"CVE-2025-68294","state":"PUBLISHED","title":"io_uring/net: ensure vectored buffer node import is tied to notification","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/net: ensure vectored buffer node import is tied to notification\n\nWhen support for vectored registered buffers was added, the import\nitself is using 'req' rather than the notification io_kiocb, sr->notif.\nFor non-vectored imports, sr->notif is correctly used. This is important\nas the lifetime of the two may be different. Use the correct io_kiocb\nfor the vectored buffer import.","publishedAt":"2025-12-16T15:06:14.177Z","updatedAt":"2026-08-05T12:10:41.250Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"23371eac7d9a9bca5360cfb3eb3aa08648ee7246","status":"affected","lessThan":"14459281e027f23b70885c1cc1032a71c0efd8d7","versionType":"git"},{"version":"23371eac7d9a9bca5360cfb3eb3aa08648ee7246","status":"affected","lessThan":"f6041803a831266a2a5a5b5af66f7de0845bcbf3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["io_uring/net.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.17.11","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["io_uring/net.c"]}],"references":["https://git.kernel.org/stable/c/14459281e027f23b70885c1cc1032a71c0efd8d7","https://git.kernel.org/stable/c/f6041803a831266a2a5a5b5af66f7de0845bcbf3"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68294.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68294","state":"PUBLISHED","datePublished":"2025-12-16T15:06:14.177Z","dateUpdated":"2026-08-05T12:10:41.250Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-16T14:48:05.293Z"},"containers":{"cna":{"title":"io_uring/net: ensure vectored buffer node import is tied to notification","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/net: ensure vectored buffer node import is tied to notification\n\nWhen support for vectored registered buffers was added, the import\nitself is using 'req' rather than the notification io_kiocb, sr->notif.\nFor non-vectored imports, sr->notif is correctly used. This is important\nas the lifetime of the two may be different. Use the correct io_kiocb\nfor the vectored buffer import."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"23371eac7d9a9bca5360cfb3eb3aa08648ee7246","status":"affected","lessThan":"14459281e027f23b70885c1cc1032a71c0efd8d7","versionType":"git"},{"version":"23371eac7d9a9bca5360cfb3eb3aa08648ee7246","status":"affected","lessThan":"f6041803a831266a2a5a5b5af66f7de0845bcbf3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["io_uring/net.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.17.11","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["io_uring/net.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/14459281e027f23b70885c1cc1032a71c0efd8d7"},{"url":"https://git.kernel.org/stable/c/f6041803a831266a2a5a5b5af66f7de0845bcbf3"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires a local process to submit an IORING_OP_SENDMSG_ZC operation through io_uring; incoming network traffic alone cannot reach the vulnerable import path.\nAC:L - The attacker controls buffer registration, the vectored send, notification lifetime, and buffer unregistration or replacement. A corked, congested, or deliberately stalled socket can reliably keep the notification outstanding after the main request completes.\nPR:L - An ordinary unprivileged user can create an io_uring instance, register their own memory, and use TCP or UDP sockets without capabilities when io_uring is enabled under its default policy.\nUI:N - No action by another user is required after the attacker submits the operations and manipulates the registered-buffer lifetime.\nS:U - Any resulting kernel compromise is a conventional local privilege escalation within the host kernel's security authority, not a mandatory cross-scope escape.\nC:H - The premature unpin permits network transmission to continue reading pages after they have been freed or recycled, potentially disclosing arbitrary kernel or other-process memory to an attacker-controlled peer.\nI:H - The stale managed fragments can cause page-reference and allocator corruption when subsequently referenced or downgraded, providing a use-after-free-class primitive that can plausibly be developed into arbitrary memory modification or kernel code execution.\nA:H - Accessing or changing references on prematurely released pages can trigger kernel faults, allocator corruption, oopses, or a system panic."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:10:41.250Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.17.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}