{"id":"CVE-2025-21666","state":"PUBLISHED","title":"vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: prevent null-ptr-deref in vsock_*[has_data|has_space]\n\nRecent reports have shown how we sometimes call vsock_*_has_data()\nwhen a vsock socket has been de-assigned from a transport (see attached\nlinks), but we shouldn't.\n\nPrevious commits should have solved the real problems, but we may have\nmore in the future, so to avoid null-ptr-deref, we can return 0\n(no space, no data available) but with a warning.\n\nThis way the code should continue to run in a nearly consistent state\nand have a warning that allows us to debug future problems.","publishedAt":"2025-01-31T11:25:31.138Z","updatedAt":"2026-10-15T01:02:53.911Z","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":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"daeac89cdb03d30028186f5ff7dc26ec8fa843e7","versionType":"git"},{"version":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"9e5fed46ccd2c34c5fa5a9c8825ce4823fdc853e","versionType":"git"},{"version":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"b52e50dd4fabd12944172bd486a4f4853b7f74dd","versionType":"git"},{"version":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"bc9c49341f9728c31fe248c5fbba32d2e81a092b","versionType":"git"},{"version":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"c23d1d4f8efefb72258e9cedce29de10d057f8ca","versionType":"git"},{"version":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"91751e248256efc111e52e15115840c35d85abaf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/af_vsock.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.234","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.177","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.127","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.74","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.11","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/vmw_vsock/af_vsock.c"]}],"references":["https://git.kernel.org/stable/c/daeac89cdb03d30028186f5ff7dc26ec8fa843e7","https://git.kernel.org/stable/c/9e5fed46ccd2c34c5fa5a9c8825ce4823fdc853e","https://git.kernel.org/stable/c/b52e50dd4fabd12944172bd486a4f4853b7f74dd","https://git.kernel.org/stable/c/bc9c49341f9728c31fe248c5fbba32d2e81a092b","https://git.kernel.org/stable/c/c23d1d4f8efefb72258e9cedce29de10d057f8ca","https://git.kernel.org/stable/c/91751e248256efc111e52e15115840c35d85abaf","https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html","https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html","https://cert-portal.siemens.com/productcert/html/ssa-265688.html"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:08:39.238Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/21xxx/CVE-2025-21666.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-21666","state":"PUBLISHED","datePublished":"2025-01-31T11:25:31.138Z","dateUpdated":"2026-10-15T01:02:53.911Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-12-29T08:45:45.733Z"},"containers":{"cna":{"title":"vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: prevent null-ptr-deref in vsock_*[has_data|has_space]\n\nRecent reports have shown how we sometimes call vsock_*_has_data()\nwhen a vsock socket has been de-assigned from a transport (see attached\nlinks), but we shouldn't.\n\nPrevious commits should have solved the real problems, but we may have\nmore in the future, so to avoid null-ptr-deref, we can return 0\n(no space, no data available) but with a warning.\n\nThis way the code should continue to run in a nearly consistent state\nand have a warning that allows us to debug future problems."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"daeac89cdb03d30028186f5ff7dc26ec8fa843e7","versionType":"git"},{"version":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"9e5fed46ccd2c34c5fa5a9c8825ce4823fdc853e","versionType":"git"},{"version":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"b52e50dd4fabd12944172bd486a4f4853b7f74dd","versionType":"git"},{"version":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"bc9c49341f9728c31fe248c5fbba32d2e81a092b","versionType":"git"},{"version":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"c23d1d4f8efefb72258e9cedce29de10d057f8ca","versionType":"git"},{"version":"c0cfa2d8a788fcf45df5bf4070ab2474c88d543a","status":"affected","lessThan":"91751e248256efc111e52e15115840c35d85abaf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/af_vsock.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.234","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.177","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.127","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.74","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.11","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/vmw_vsock/af_vsock.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/daeac89cdb03d30028186f5ff7dc26ec8fa843e7"},{"url":"https://git.kernel.org/stable/c/9e5fed46ccd2c34c5fa5a9c8825ce4823fdc853e"},{"url":"https://git.kernel.org/stable/c/b52e50dd4fabd12944172bd486a4f4853b7f74dd"},{"url":"https://git.kernel.org/stable/c/bc9c49341f9728c31fe248c5fbba32d2e81a092b"},{"url":"https://git.kernel.org/stable/c/c23d1d4f8efefb72258e9cedce29de10d057f8ca"},{"url":"https://git.kernel.org/stable/c/91751e248256efc111e52e15115840c35d85abaf"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:04:05.814Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.234"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.15.177"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.1.127"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.6.74"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.12.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","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-2025-21666","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:52:24.276957Z"}}}],"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":"2025-10-01T19:57:12.729Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T20:58:44.611Z"}},{"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]}],"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}],"providerMetadata":{"shortName":"siemens-SADP","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","dateUpdated":"2026-10-15T01:02:53.911Z"},"x_adpType":"supplier"}]}}}