What’s Vulnerable › Vulnerabilities

CVE-2026-89693: nfsd: check nfsd4_acl_to_attr() return value in nfsd4_create()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: check nfsd4_acl_to_attr() return value in nfsd4_create() nfsd4_create() stores the return value of nfsd4_acl_to_attr() in status, but the switch(create->cr_type) block unconditionally overwrites it in every branch. ACL translation errors are silently discarded, and the CREATE proceeds without the requested ACL. Add an early exit check after nfsd4_acl_to_attr(), matching the pattern already used in nfsd4_setattr(). [ cel: prefer NFS4ERR_BADTYPE over NFS4ERR_ATTRNOTSUPP ]

Affected products

• Linux: from 5.10.220 before 5.10.273; from 5.15.154 before 5.15.224 — fixed in 5.10.273, 5.15.224

How to fix

Upgrade to a fixed version: Linux 5.10.273, 5.15.224. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/04b913ab96c2a874f41b5e5a19ac7120526723c2
• https://git.kernel.org/stable/c/154acf97ecd2c0bb00f6533f86d4bd2b934475d5
• https://git.kernel.org/stable/c/26877d3a09afb3838a053867a655ca30c46a1f81
• https://git.kernel.org/stable/c/2c7912732184773dbd371a411da87af1cc080b86
• https://git.kernel.org/stable/c/2d8a8ed4f9d8637ef0f18d47d19193e7b780e90e
• https://git.kernel.org/stable/c/430ed49a16cf9ca249d0fb51490582090bc4848b
• https://git.kernel.org/stable/c/73dfa989f6f0dedcae1f2650aab3401537044282
• https://git.kernel.org/stable/c/80cebb0e8a8d1e758f0d671f5e047279c5c3e528

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