{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97584","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-24T16:01:01.156Z","datePublished":"2026-09-25T10:22:04.322Z","dateUpdated":"2026-09-25T14:41:25.662Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-25T14:41:25.662Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix incorrect free in candidate cleanup in afs_lookup_server()\n\nFix afs_lookup_server() to not free an existing server's endpoint state\nwhen cleaning up a candidate server.  The candidate record doesn't have an\nendpoint state yet at this point, so the free for that can just be removed."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - afs_lookup_server() is reached through afs_create_volume()/afs_update_volume_state() -> afs_alloc_server_list() when a local process walks a kAFS path (for example /afs/<cell>/<vol> automount) or uses a volume. Nothing malformed comes off the wire. The defect is local cleanup logic that frees the wrong object, so the attacker needs a local account on the AFS client.\nAC:L - The candidate is left non-NULL when afs_install_server() returns an existing record. That happens when the attacker runs parallel lookups of volumes on the same fileserver UUID, or accesses the path again after a creation attempt failed and left the record marked UNCREATED. Both states come from the attacker's own path accesses; neither depends on outside conditions.\nPR:L - Mounting kAFS needs CAP_SYS_ADMIN (no FS_USERNS_MOUNT). On a client that already has the /afs dynroot mounted, any unprivileged user can start the volume and server lookups that reach afs_lookup_server() just by accessing /afs/<cell>/... paths.\nUI:N - No victim action is needed; the attacker triggers the lookups and the faulty cleanup with their own filesystem accesses.\nS:U - The memory corruption stays inside the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The cleanup at the out: label kfree()s the existing server's live, refcounted afs_endpoint_state. server->endpoint_state and in-flight probe/rotate operations still reference it, giving a use-after-free of a sprayable kmalloc object that can be reclaimed to leak kernel data.\nI:H - After the bad kfree(), afs_put_endpoint_state() and the probe code keep writing refcounts, flags and the addresses pointer into the freed estate. When the refcount later drops to zero it is freed a second time via call_rcu, so a reclaimed object gets corrupted.\nA:H - The freed estate is later used and double-freed, and on the create_failed and wait_for_creation failure paths `server` is NULL when server->endpoint_state is read. Either way the kernel oopses or panics."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/server.c"],"versions":[{"version":"d6aa05cd995830f6dcee7b139335edb266de38a6","lessThan":"981d72663dee2fa6efaf202293e68d2b10a0d1d4","status":"affected","versionType":"git"},{"version":"4882ba78574e2d8c579658f65f6784b0d139d173","lessThan":"e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c","status":"affected","versionType":"git"},{"version":"4882ba78574e2d8c579658f65f6784b0d139d173","lessThan":"349e713039a1fd6659c27e7a66238bfa49ce37e9","status":"affected","versionType":"git"},{"version":"4882ba78574e2d8c579658f65f6784b0d139d173","lessThan":"044d596094af4b769fb8e1173dff0d08bd68db6c","status":"affected","versionType":"git"},{"version":"6.12.101","lessThan":"6.12.111","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/server.c"],"versions":[{"version":"6.15","status":"affected"},{"version":"0","lessThan":"6.15","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc3","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":"6.12.101","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.3-rc3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/981d72663dee2fa6efaf202293e68d2b10a0d1d4"},{"url":"https://git.kernel.org/stable/c/e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c"},{"url":"https://git.kernel.org/stable/c/349e713039a1fd6659c27e7a66238bfa49ce37e9"},{"url":"https://git.kernel.org/stable/c/044d596094af4b769fb8e1173dff0d08bd68db6c"}],"title":"afs: Fix incorrect free in candidate cleanup in afs_lookup_server()","x_generator":{"engine":"bippy-1.2.0"}}}}