{"id":"CVE-2025-37924","state":"PUBLISHED","title":"ksmbd: fix use-after-free in kerberos authentication","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in kerberos authentication\n\nSetting sess->user = NULL was introduced to fix the dangling pointer\ncreated by ksmbd_free_user. However, it is possible another thread could\nbe operating on the session and make use of sess->user after it has been\npassed to ksmbd_free_user but before sess->user is set to NULL.","publishedAt":"2025-05-20T15:21:52.681Z","updatedAt":"2026-10-15T21:52:04.260Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/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":"e34a33d5d7e87399af0a138bb32f6a3e95dd83d2","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"b447463562238428503cfba1c913261047772f90","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"e18c616718018dfc440e4a2d2b94e28fe91b1861","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"28c756738af44a404a91b77830d017bb0c525890","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"e86e9134e1d1c90a960dd57f59ce574d27b9a124","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/auth.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":"6.1.138","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.90","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.28","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.14.6","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/smb2pdu.c"]}],"references":["https://git.kernel.org/stable/c/e34a33d5d7e87399af0a138bb32f6a3e95dd83d2","https://git.kernel.org/stable/c/b447463562238428503cfba1c913261047772f90","https://git.kernel.org/stable/c/e18c616718018dfc440e4a2d2b94e28fe91b1861","https://git.kernel.org/stable/c/28c756738af44a404a91b77830d017bb0c525890","https://git.kernel.org/stable/c/e86e9134e1d1c90a960dd57f59ce574d27b9a124","https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:03.054Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/37xxx/CVE-2025-37924.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-37924","state":"PUBLISHED","datePublished":"2025-05-20T15:21:52.681Z","dateUpdated":"2026-10-15T21:52:04.260Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T04:51:23.969Z"},"containers":{"cna":{"title":"ksmbd: fix use-after-free in kerberos authentication","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in kerberos authentication\n\nSetting sess->user = NULL was introduced to fix the dangling pointer\ncreated by ksmbd_free_user. However, it is possible another thread could\nbe operating on the session and make use of sess->user after it has been\npassed to ksmbd_free_user but before sess->user is set to NULL."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"e34a33d5d7e87399af0a138bb32f6a3e95dd83d2","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"b447463562238428503cfba1c913261047772f90","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"e18c616718018dfc440e4a2d2b94e28fe91b1861","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"28c756738af44a404a91b77830d017bb0c525890","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"e86e9134e1d1c90a960dd57f59ce574d27b9a124","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/auth.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":"6.1.138","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.90","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.28","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.14.6","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/smb2pdu.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e34a33d5d7e87399af0a138bb32f6a3e95dd83d2"},{"url":"https://git.kernel.org/stable/c/b447463562238428503cfba1c913261047772f90"},{"url":"https://git.kernel.org/stable/c/e18c616718018dfc440e4a2d2b94e28fe91b1861"},{"url":"https://git.kernel.org/stable/c/28c756738af44a404a91b77830d017bb0c525890"},{"url":"https://git.kernel.org/stable/c/e86e9134e1d1c90a960dd57f59ce574d27b9a124"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"ksmbd kerberos authentication UAF. sess->user freed by one thread while another thread still accesses it during concurrent session setup. Attacker opens two connections to same session and sends concurrent SESSION_SETUP requests, controlling both sides of the race. Network-reachable, pre-authentication."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T11:58:25.065Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.138"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.90"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.28"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.14.6"},{"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":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T19:57:23.372Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2025-37924","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-15T21:46:12.066488Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-15T21:52:04.260Z"}}]}}}