CVE-2026-89686Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke nfsd4_alloc_layout_stateid reads fp->fi_deleg_file without holding fi_lock when the parent s…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
0.2% → 0.7%
5.3 → 9.8
medium → critical
9.8 → 5.3
critical → medium
5.3 → 7
medium → high
7 → 9.8
high → critical
Last analysed / modified upstream
9.8 → 5.3
critical → medium
5.3 → 9.8
medium → critical
In the Linux kernel, the following vulnerability has been resolved:
nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke
nfsd4_alloc_layout_stateid reads fp->fi_deleg_file without holding fi_lock when the parent stateid is a delegation. A concurrent delegation revoke via the laundromat can clear fi_deleg_file under fi_lock, causing nfsd_file_get() to return NULL and triggering the BUG_ON.
This race is client-reachable: two NFS clients can trigger it by having one hold a delegation while another opens the same file to force a recall. When the first client doesn't respond to the recall, the laundromat revokes it. A concurrent LAYOUTGET from any client using the delegation stateid hits the race window.
Fix this by taking fi_lock around the fi_deleg_file read in the SC_TYPE_DELEG path, matching the locking discipline of the find_any_file() arm, and replacing the BUG_ON with a graceful error return that cleans up the partially-initialized layout stateid.
Linux >= c5c707f96fc9a6e5a57ca5baac892673270abe3d < d12af460df27876661707efab3a8532146cb961fLinux >= c5c707f96fc9a6e5a57ca5baac892673270abe3d < c517f27498757e616d2a8fe6d16caad1fee422e6Linux >= c5c707f96fc9a6e5a57ca5baac892673270abe3d < 607a56fea772c1f4f4989d8e255dd4f7192d9604Linux >= c5c707f96fc9a6e5a57ca5baac892673270abe3d < 97bda8b4284d90897a1f1922e5082ff9e35d7c7eLinux >= c5c707f96fc9a6e5a57ca5baac892673270abe3d < ca94ba36172046be6a694a7986f6931e47ed4d51Linux 4.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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