{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72378","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.922Z","datePublished":"2026-08-15T05:56:11.641Z","dateUpdated":"2026-08-17T05:43:29.813Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:43:29.813Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix error code in afs_extract_vl_addrs()\n\nThe error codes on these paths are only set on the first iteration\nthrough the loop.  Set the correct error code on every iteration."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - Malformed data reaches afs_extract_vl_addrs() from DNS AFSDB server-list replies fetched over the network via dns_query()/request_key upcall during afs_dns_query() cell VL lookups and periodic TTL refresh.\nAC:L - An attacker who can supply the DNS server-list payload can reliably trigger the bug by encoding two or more addresses with a valid first entry and a truncated second IPv4/IPv6 record, forcing the stale ret=0 error path on iteration two or later.\nPR:N - No local account or kernel capabilities are required on the victim; a network-positioned attacker can deliver the malicious binary DNS server-list response whenever the kAFS client resolves an AFSDB record for a targeted cell name.\nUI:N - Exploitation does not require victim interaction at trigger time because kAFS automatically re-queries DNS on cell setup and TTL expiry through afs_update_cell(), so a poisoned response can crash the kernel without further user action.\nS:U - The flaw is a kernel NULL-pointer dereference in AFS DNS parsing that crashes the local host; it does not cross a VM, container, or IOMMU security boundary to affect a different authority.\nC:N - The failure mode is returning ERR_PTR(0) after freeing the address list, causing a NULL dereference in the caller; there is no out-of-bounds read, use-after-free reuse, or other memory disclosure primitive.\nI:N - Impact is limited to a kernel oops from writing addrs->source on a NULL pointer after a parse error is mishandled; no attacker-controlled memory corruption or arbitrary write primitive is established.\nA:H - The NULL pointer dereference in afs_extract_vlserver_list() runs in the kAFS cell manager workqueue during DNS parsing and causes a kernel oops or panic, fully denying system availability."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/vl_list.c"],"versions":[{"version":"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257","lessThan":"7ce6737a975ea3e0dc2e5946628d233779ca0caf","status":"affected","versionType":"git"},{"version":"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257","lessThan":"4e0b047848a855f2c933a6439f76a01743ba5620","status":"affected","versionType":"git"},{"version":"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257","lessThan":"f70fbf2b974b63a7042705c2b0464cb8c97e9f34","status":"affected","versionType":"git"},{"version":"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257","lessThan":"9ad9016e3333c3c1f9284a253ff0658369e07aac","status":"affected","versionType":"git"},{"version":"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257","lessThan":"cb33dd2968588c78fad78dec19f61cabe5785494","status":"affected","versionType":"git"},{"version":"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257","lessThan":"8530206911fd66ad739ca5ce95f1d069f3d42204","status":"affected","versionType":"git"},{"version":"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257","lessThan":"bdcd80ff12939d172043fac5eb822b92366a1bab","status":"affected","versionType":"git"},{"version":"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257","lessThan":"4897cb71d4ab1f7e1a214adb1e4b80176702368d","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/vl_list.c"],"versions":[{"version":"4.20","status":"affected"},{"version":"0","lessThan":"4.20","status":"unaffected","versionType":"semver"},{"version":"5.10.261","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/7ce6737a975ea3e0dc2e5946628d233779ca0caf"},{"url":"https://git.kernel.org/stable/c/4e0b047848a855f2c933a6439f76a01743ba5620"},{"url":"https://git.kernel.org/stable/c/f70fbf2b974b63a7042705c2b0464cb8c97e9f34"},{"url":"https://git.kernel.org/stable/c/9ad9016e3333c3c1f9284a253ff0658369e07aac"},{"url":"https://git.kernel.org/stable/c/cb33dd2968588c78fad78dec19f61cabe5785494"},{"url":"https://git.kernel.org/stable/c/8530206911fd66ad739ca5ce95f1d069f3d42204"},{"url":"https://git.kernel.org/stable/c/bdcd80ff12939d172043fac5eb822b92366a1bab"},{"url":"https://git.kernel.org/stable/c/4897cb71d4ab1f7e1a214adb1e4b80176702368d"}],"title":"afs: Fix error code in afs_extract_vl_addrs()","x_generator":{"engine":"bippy-1.2.0"}}}}