CVE-2026-97584 (GCVE-0-2026-97584)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:22 – Updated: 2026-09-25 14:41
VLAI
Title
afs: Fix incorrect free in candidate cleanup in afs_lookup_server()
Summary
In the Linux kernel, the following vulnerability has been resolved: afs: Fix incorrect free in candidate cleanup in afs_lookup_server() Fix afs_lookup_server() to not free an existing server's endpoint state when cleaning up a candidate server. The candidate record doesn't have an endpoint state yet at this point, so the free for that can just be removed.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d6aa05cd995830f6dcee7b139335edb266de38a6 , < 981d72663dee2fa6efaf202293e68d2b10a0d1d4 (git)
Affected: 4882ba78574e2d8c579658f65f6784b0d139d173 , < e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c (git)
Affected: 4882ba78574e2d8c579658f65f6784b0d139d173 , < 349e713039a1fd6659c27e7a66238bfa49ce37e9 (git)
Affected: 4882ba78574e2d8c579658f65f6784b0d139d173 , < 044d596094af4b769fb8e1173dff0d08bd68db6c (git)
Affected: 6.12.101 , < 6.12.111 (semver)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - afs_lookup_server() is reached through afs_create_volume()/afs_update_volume_state() -\u003e afs_alloc_server_list() when a local process walks a kAFS path (for example /afs/\u003ccell\u003e/\u003cvol\u003e 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\u0027s 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/\u003ccell\u003e/... 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\u0027s own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The cleanup at the out: label kfree()s the existing server\u0027s live, refcounted afs_endpoint_state. server-\u003eendpoint_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-\u003eendpoint_state is read. Either way the kernel oopses or panics."
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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