{ "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": "2026-10-19T09:09:47.944Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:09:47.944Z" }, "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// 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//... 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", "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" } ] } ] } ], "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" } } } }