nfsd: gate nfs2 setacl by argp->mask
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.157, 6.12.109, 6.18.50, 7.2.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: total
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From a257cdd0e2179630d3201c32ba14d7fcb3c3a055 · fixed in 8e4422b05f410f95c51b68a0db4bf1d87f6d22f5; From a257cdd0e2179630d3201c32ba14d7fcb3c3a055 · fixed in e41d173d9dc735cecb15ab7aa63ecab09338f81b; From a257cdd0e2179630d3201c32ba14d7fcb3c3a055 · fixed in f951b22dbeec46f2e0fba81cb80d1b0c686b61eb; From a257cdd0e2179630d3201c32ba14d7fcb3c3a055 · fixed in 37eea38e7898538f0ec5f1eb8b18d8646e4be41c; From a257cdd0e2179630d3201c32ba14d7fcb3c3a055 · fixed in a3a7e20ed66d3f04d37883c398da8a113b430769
- Linux Linux
2.6.13
- KernelLinux
From 2.6.13 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4