nfsd: gate nfs2 setacl by argp->mask

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89672
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:53 UTC
Updated2026-10-16 20:18:26 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.005220000 probability, percentile 0.427800000 (date 2026-09-14)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 8e4422b05f410f95c51b68a0db4bf1d87f6d22f5 git Not specified
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 e41d173d9dc735cecb15ab7aa63ecab09338f81b git Not specified
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 f951b22dbeec46f2e0fba81cb80d1b0c686b61eb git Not specified
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 37eea38e7898538f0ec5f1eb8b18d8646e4be41c git Not specified
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 a3a7e20ed66d3f04d37883c398da8a113b430769 git Not specified
CNA Linux Linux affected 2.6.13 Not specified
CNA Linux Linux unaffected 2.6.13 semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e41d173d9dc735cecb15ab7aa63ecab09338f81b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8e4422b05f410f95c51b68a0db4bf1d87f6d22f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f951b22dbeec46f2e0fba81cb80d1b0c686b61eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a3a7e20ed66d3f04d37883c398da8a113b430769 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/37eea38e7898538f0ec5f1eb8b18d8646e4be41c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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