CVE-2026-89695High· 7.5▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: nfsd: cap decoded POSIX ACL count to bound sort cost nfsd4_decode_posixacl() reads a u32 entry count off the wire and passes it straight to posix_acl_alloc() and sort_…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · 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%
0.2% → 0.5%
— → 5.3
— → 7.5
none → high
7.5 → 5.3
high → medium
5.3 → 7.5
medium → high
7.5 → 5.3
high → medium
5.3 → 7
medium → high
Last analysed / modified upstream
7 → 7.5
In the Linux kernel, the following vulnerability has been resolved:
nfsd: cap decoded POSIX ACL count to bound sort cost
nfsd4_decode_posixacl() reads a u32 entry count off the wire and passes it straight to posix_acl_alloc() and sort_pacl_range(). The latter is an O(n^2) bubble sort, so a client-chosen count drives unbounded CPU in the server's compound processing path.
nfsd4_decode_posixacl()
xdr_stream_decode_u32(&count) /* uncapped u32 */
posix_acl_alloc(count, GFP_KERNEL)
sort_pacl_range(*acl, 0, count - 1) /* O(n^2) bubble sort */
The encoder side in the same file already rejects ACLs whose a_count exceeds NFS_ACL_MAX_ENTRIES, but the decoder introduced in commit 5fc51dfc2eb1 ("NFSD: Add support for XDR decoding POSIX draft ACLs") omitted the symmetric check.
Fix by rejecting a wire count greater than NFS_ACL_MAX_ENTRIES with nfserr_inval, before any allocation, so the sort is bounded by NFS_ACL_MAX_ENTRIES^2 comparisons.
While we're in here, also fix the nfserr_resource return if posix_acl_alloc() fails. That's not a legal error code for v4.1+. Change it to return nfserr_jukebox as that's more appropriate for memory allocation failures.
Linux >= 5fc51dfc2eb160bd7ab3251ab1767cacf9c8bf05 < ea14d71d6ecb925673761bcf79f781f7dc9042ccLinux >= 5fc51dfc2eb160bd7ab3251ab1767cacf9c8bf05 < 4bc1108e876153a2dd6d874052b99182c3603135Linux 7.0Refer 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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