{"id":"CVE-2025-22040","state":"PUBLISHED","title":"ksmbd: fix session use-after-free in multichannel connection","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix session use-after-free in multichannel connection\n\nThere is a race condition between session setup and\nksmbd_sessions_deregister. The session can be freed before the connection\nis added to channel list of session.\nThis patch check reference count of session before freeing it.","publishedAt":"2025-04-16T14:11:57.601Z","updatedAt":"2026-08-05T11:56:13.212Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/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":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"596407adb9af1ee75fe7c7529607783d31b66e7f","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"3980770cb1470054e6400fd97668665975726737","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"9069939d762138e232a6f79e3e1462682ed6a17d","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"94c281721d4ed2d972232414b91d98a6f5bdb16b","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"7dfbd4c43eed91dd2548a95236908025707a8dfd","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/auth.c","fs/smb/server/mgmt/user_session.c","fs/smb/server/smb2pdu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"6.1.134","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.87","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.23","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13.11","status":"unaffected","lessThanOrEqual":"6.13.*","versionType":"semver"},{"version":"6.14.2","status":"unaffected","lessThanOrEqual":"6.14.*","versionType":"semver"},{"version":"6.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/auth.c","fs/smb/server/mgmt/user_session.c","fs/smb/server/smb2pdu.c"]}],"references":["https://git.kernel.org/stable/c/596407adb9af1ee75fe7c7529607783d31b66e7f","https://git.kernel.org/stable/c/3980770cb1470054e6400fd97668665975726737","https://git.kernel.org/stable/c/9069939d762138e232a6f79e3e1462682ed6a17d","https://git.kernel.org/stable/c/94c281721d4ed2d972232414b91d98a6f5bdb16b","https://git.kernel.org/stable/c/7dfbd4c43eed91dd2548a95236908025707a8dfd","https://git.kernel.org/stable/c/fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db","https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:08:39.238Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/22xxx/CVE-2025-22040.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-22040","state":"PUBLISHED","datePublished":"2025-04-16T14:11:57.601Z","dateUpdated":"2026-08-05T11:56:13.212Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-12-29T08:45:45.809Z"},"containers":{"cna":{"title":"ksmbd: fix session use-after-free in multichannel connection","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix session use-after-free in multichannel connection\n\nThere is a race condition between session setup and\nksmbd_sessions_deregister. The session can be freed before the connection\nis added to channel list of session.\nThis patch check reference count of session before freeing it."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"596407adb9af1ee75fe7c7529607783d31b66e7f","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"3980770cb1470054e6400fd97668665975726737","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"9069939d762138e232a6f79e3e1462682ed6a17d","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"94c281721d4ed2d972232414b91d98a6f5bdb16b","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"7dfbd4c43eed91dd2548a95236908025707a8dfd","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/auth.c","fs/smb/server/mgmt/user_session.c","fs/smb/server/smb2pdu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"6.1.134","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.87","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.23","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13.11","status":"unaffected","lessThanOrEqual":"6.13.*","versionType":"semver"},{"version":"6.14.2","status":"unaffected","lessThanOrEqual":"6.14.*","versionType":"semver"},{"version":"6.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/auth.c","fs/smb/server/mgmt/user_session.c","fs/smb/server/smb2pdu.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/596407adb9af1ee75fe7c7529607783d31b66e7f"},{"url":"https://git.kernel.org/stable/c/3980770cb1470054e6400fd97668665975726737"},{"url":"https://git.kernel.org/stable/c/9069939d762138e232a6f79e3e1462682ed6a17d"},{"url":"https://git.kernel.org/stable/c/94c281721d4ed2d972232414b91d98a6f5bdb16b"},{"url":"https://git.kernel.org/stable/c/7dfbd4c43eed91dd2548a95236908025707a8dfd"},{"url":"https://git.kernel.org/stable/c/fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"ksmbd multichannel session UAF. Attacker authenticates on connection 1, initiates multichannel binding on connection 2, disconnects connection 1 during setup. All steps are attacker-initiated, race is fully attacker-controlled. Network-reachable."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T11:56:13.212Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.87"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.23"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.13.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.14.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.15"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2025-22040","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2025-04-21T14:57:48.411411Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-04-21T15:01:46.532Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T19:41:21.699Z"}}]}}}