nfsd: gate nfs2 setacl by argp->mask
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Partial Red Hat: 5 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: gate nfs2 setacl by argp->mask The NFSACL v2 SETACL path shares the decoder convention used by its v3 sibling: nfsaclsvc_decode_setaclargs() fills in argp->acl_access only when NFS_ACL is set in the request mask and argp->acl_default only when NFS_DFACL is set, leaving the other pointer NULL because the argument buffer is zeroed up to pc_argzero before decode. nfsacld_proc_setacl() then hands both pointers to set_posix_acl() unconditionally. set_posix_acl(idmap, dentry, type, NULL) is the VFS "remove this ACL type" operation, so an omitted arm is indistinguishable from an explicit request to delete that ACL. A SETACL carrying only NFS_ACL silently strips the directory's default ACL; mask=0 strips both. This is the same defect just fixed in nfsd3_proc_setacl(); apply the same remedy. Gate each set_posix_acl() call on its mask bit and initialize error to 0 so that a request with neither bit set leaves the on-disk ACLs untouched and returns success. The out_drop_lock path and the unconditional posix_acl_release() in nfsaclsvc_release_setacl() already tolerate the skipped arms.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 2.6.13 and later | 5.10.273, 5.15.224, 6.1.191, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.13 and later Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-89672
- 2026-10-03 Alias added: GHSA-cpgj-m749-r929
- 2026-10-18 CISA SSVC decision points changed
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-30 Affected versions changed · Red Hat
- 2026-10-30 Fix available: Linux/[email protected], Linux/[email protected], Linux/Linux@54ff9c81d6b77de4540ba33a3b4d613ce3194863 +3 · CNA
- 2026-10-30 3 new references · CNA
- 2026-11-04 Affected versions changed · Red Hat
- 2026-11-04 CVSS score changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/d00a2f81ba7c57045bd644971ddb6961c5efe3e0
- https://git.kernel.org/stable/c/760e7a4f92f597c61ab6b089f934a7e3acf238b7
- https://git.kernel.org/stable/c/54ff9c81d6b77de4540ba33a3b4d613ce3194863
- https://git.kernel.org/stable/c/8e4422b05f410f95c51b68a0db4bf1d87f6d22f5
- https://git.kernel.org/stable/c/e41d173d9dc735cecb15ab7aa63ecab09338f81b
- https://git.kernel.org/stable/c/f951b22dbeec46f2e0fba81cb80d1b0c686b61eb
- https://git.kernel.org/stable/c/37eea38e7898538f0ec5f1eb8b18d8646e4be41c
- https://git.kernel.org/stable/c/a3a7e20ed66d3f04d37883c398da8a113b430769
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Sources
- CVE-2026-89672 · CVE Program
- CVE-2026-89672 · NVD
- FIRST EPSS
- GHSA-cpgj-m749-r929 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-89672 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences