CVE-2026-89691High· 7.1▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: nfsd: clear opcnt on compound arg release to prevent OOB read nfsd4_release_compoundargs() resets args->ops to the inline iops[8] array when the dynamically-allocated …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 39.1 · likelihood 0 · exploitation 0
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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%
— → 7.4
none → high
— → 7.4
none → high
— → 7.1
none → high
7.1 → 7.4
7.4 → 7.1
7.1 → 7.4
7.4 → 7
Last analysed / modified upstream
7 → 7.1
In the Linux kernel, the following vulnerability has been resolved:
nfsd: clear opcnt on compound arg release to prevent OOB read
nfsd4_release_compoundargs() resets args->ops to the inline iops[8] array when the dynamically-allocated ops buffer is freed, but leaves args->opcnt at its original value (which can be up to 200 for NFSv4.1+ compounds).
If rq_status_counter is stuck at an odd value (which can happen when nfsd_dispatch() hits an error path after setting it odd), the RPC status dumpit handler reads min(opcnt, 16) entries from args->ops[]. Since iops only has 8 elements and is the last field in struct nfsd4_compoundargs, reading indices 8-15 accesses adjacent slab memory and leaks it to userspace via netlink.
Zero opcnt unconditionally in nfsd4_release_compoundargs() so stale compound metadata is never exposed through the status interface.
[ cel: Remove the kvfree_rcu_mightsleep() sleep from the exposure window ]
Linux >= bd9d6a3efa9709e653aafbeb859289feccb8e70c < 58bcdfb2b2e412088839ae740b1a95154dc0b8d0Linux >= bd9d6a3efa9709e653aafbeb859289feccb8e70c < e879148867bd4c4cac42e063ffaffa187dddc6feLinux >= bd9d6a3efa9709e653aafbeb859289feccb8e70c < c1a4f7b1848f95302df598217e1c7a1410c2d0c5Linux >= bd9d6a3efa9709e653aafbeb859289feccb8e70c < ae4c38555e81563b8dc5eae55ffd70f0ea97aa5aLinux 6.7Refer 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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