{"id":"CVE-2024-40931","state":"PUBLISHED","title":"mptcp: ensure snd_una is properly initialized on connect","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: ensure snd_una is properly initialized on connect\n\nThis is strictly related to commit fb7a0d334894 (\"mptcp: ensure snd_nxt\nis properly initialized on connect\"). It turns out that syzkaller can\ntrigger the retransmit after fallback and before processing any other\nincoming packet - so that snd_una is still left uninitialized.\n\nAddress the issue explicitly initializing snd_una together with snd_nxt\nand write_seq.","publishedAt":"2024-07-12T12:25:09.778Z","updatedAt":"2026-05-11T20:22:36.148Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8fd738049ac3d67a937d36577763b47180aae1ad","status":"affected","lessThan":"208cd22ef5e57f82d38ec11c1a1703f9401d6dde","versionType":"git"},{"version":"8fd738049ac3d67a937d36577763b47180aae1ad","status":"affected","lessThan":"7b9c7fc8600b64a86e4b47b2d190bba380267726","versionType":"git"},{"version":"8fd738049ac3d67a937d36577763b47180aae1ad","status":"affected","lessThan":"f03c46eabb3a67bd2993e237ab5517f00a5f1813","versionType":"git"},{"version":"8fd738049ac3d67a937d36577763b47180aae1ad","status":"affected","lessThan":"f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57f","versionType":"git"},{"version":"8fd738049ac3d67a937d36577763b47180aae1ad","status":"affected","lessThan":"ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ce","versionType":"git"},{"version":"8fd738049ac3d67a937d36577763b47180aae1ad","status":"affected","lessThan":"8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mptcp/protocol.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"5.10.221","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.162","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.95","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.35","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.9.6","status":"unaffected","lessThanOrEqual":"6.9.*","versionType":"semver"},{"version":"6.10","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mptcp/protocol.c"]}],"references":["https://git.kernel.org/stable/c/208cd22ef5e57f82d38ec11c1a1703f9401d6dde","https://git.kernel.org/stable/c/7b9c7fc8600b64a86e4b47b2d190bba380267726","https://git.kernel.org/stable/c/f03c46eabb3a67bd2993e237ab5517f00a5f1813","https://git.kernel.org/stable/c/f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57f","https://git.kernel.org/stable/c/ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ce","https://git.kernel.org/stable/c/8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3","https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:39.287Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/40xxx/CVE-2024-40931.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-40931","state":"PUBLISHED","datePublished":"2024-07-12T12:25:09.778Z","dateUpdated":"2026-05-11T20:22:36.148Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-07-12T12:17:45.583Z"},"containers":{"cna":{"title":"mptcp: ensure snd_una is properly initialized on connect","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: ensure snd_una is properly initialized on connect\n\nThis is strictly related to commit fb7a0d334894 (\"mptcp: ensure snd_nxt\nis properly initialized on connect\"). It turns out that syzkaller can\ntrigger the retransmit after fallback and before processing any other\nincoming packet - so that snd_una is still left uninitialized.\n\nAddress the issue explicitly initializing snd_una together with snd_nxt\nand 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