{"id":"CVE-2025-21636","state":"PUBLISHED","title":"sctp: sysctl: plpmtud_probe_interval: avoid using current->nsproxy","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: plpmtud_probe_interval: avoid using current->nsproxy\n\nAs mentioned in a previous commit of this series, using the 'net'\nstructure via 'current' is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader's/writer's netns vs only\n  from the opener's netns.\n\n- current->nsproxy can be NULL in some cases, resulting in an 'Oops'\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n  syzbot [1] using acct(2).\n\nThe 'net' structure can be obtained from the table->data using\ncontainer_of().\n\nNote that table->data could also be used directly, as this is the only\nmember needed from the 'net' structure, but that would increase the size\nof this fix, to use '*data' everywhere 'net->sctp.probe_interval' is\nused.","publishedAt":"2025-01-19T10:17:54.576Z","updatedAt":"2026-05-11T21:03:30.803Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1e462a7a5f359cbb9a0e8fbfafcfb6657034105","status":"affected","lessThan":"1dc5da6c4178f3e4b95c631418f72de9f86c0449","versionType":"git"},{"version":"d1e462a7a5f359cbb9a0e8fbfafcfb6657034105","status":"affected","lessThan":"44ee8635922b6eb940faddb961a8347c6857d722","versionType":"git"},{"version":"d1e462a7a5f359cbb9a0e8fbfafcfb6657034105","status":"affected","lessThan":"284a221f8fa503628432c7bb5108277c688c6ffa","versionType":"git"},{"version":"d1e462a7a5f359cbb9a0e8fbfafcfb6657034105","status":"affected","lessThan":"bcf8c60074e81ed2ac2d35130917175a3949c917","versionType":"git"},{"version":"d1e462a7a5f359cbb9a0e8fbfafcfb6657034105","status":"affected","lessThan":"6259d2484d0ceff42245d1f09cc8cb6ee72d847a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/sysctl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.15.177","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.125","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.72","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.10","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/sysctl.c"]}],"references":["https://git.kernel.org/stable/c/1dc5da6c4178f3e4b95c631418f72de9f86c0449","https://git.kernel.org/stable/c/44ee8635922b6eb940faddb961a8347c6857d722","https://git.kernel.org/stable/c/284a221f8fa503628432c7bb5108277c688c6ffa","https://git.kernel.org/stable/c/bcf8c60074e81ed2ac2d35130917175a3949c917","https://git.kernel.org/stable/c/6259d2484d0ceff42245d1f09cc8cb6ee72d847a","https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:08:39.238Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/21xxx/CVE-2025-21636.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-21636","state":"PUBLISHED","datePublished":"2025-01-19T10:17:54.576Z","dateUpdated":"2026-05-11T21:03:30.803Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-12-29T08:45:45.726Z"},"containers":{"cna":{"title":"sctp: sysctl: plpmtud_probe_interval: avoid using current->nsproxy","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: plpmtud_probe_interval: avoid using current->nsproxy\n\nAs mentioned in a previous commit of this series, using the 'net'\nstructure via 'current' is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader's/writer's netns vs only\n  from the opener's netns.\n\n- current->nsproxy can be NULL in some cases, resulting in an 'Oops'\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n  syzbot [1] using acct(2).\n\nThe 'net' structure can be obtained from the table->data using\ncontainer_of().\n\nNote that table->data could also be used directly, as this is the only\nmember needed from the 'net' structure, but that would increase the size\nof this fix, to use '*data' everywhere 'net->sctp.probe_interval' is\nused."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1e462a7a5f359cbb9a0e8fbfafcfb6657034105","status":"affected","lessThan":"1dc5da6c4178f3e4b95c631418f72de9f86c0449","versionType":"git"},{"version":"d1e462a7a5f359cbb9a0e8fbfafcfb6657034105","status":"affected","lessThan":"44ee8635922b6eb940faddb961a8347c6857d722","versionType":"git"},{"version":"d1e462a7a5f359cbb9a0e8fbfafcfb6657034105","status":"affected","lessThan":"284a221f8fa503628432c7bb5108277c688c6ffa","versionType":"git"},{"version":"d1e462a7a5f359cbb9a0e8fbfafcfb6657034105","status":"affected","lessThan":"bcf8c60074e81ed2ac2d35130917175a3949c917","versionType":"git"},{"version":"d1e462a7a5f359cbb9a0e8fbfafcfb6657034105","status":"affected","lessThan":"6259d2484d0ceff42245d1f09cc8cb6ee72d847a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/sysctl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.15.177","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.125","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.72","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.10","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/sysctl.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1dc5da6c4178f3e4b95c631418f72de9f86c0449"},{"url":"https://git.kernel.org/stable/c/44ee8635922b6eb940faddb961a8347c6857d722"},{"url":"https://git.kernel.org/stable/c/284a221f8fa503628432c7bb5108277c688c6ffa"},{"url":"https://git.kernel.org/stable/c/bcf8c60074e81ed2ac2d35130917175a3949c917"},{"url":"https://git.kernel.org/stable/c/6259d2484d0ceff42245d1f09cc8cb6ee72d847a"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:03:30.803Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"5.15.177"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.1.125"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.6.72"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.12.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2025-21636","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:54:13.852333Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","type":"CWE","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T19:57:17.956Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T20:58:13.639Z"}}]}}}