CVE-2024-46695 (GCVE-0-2024-46695)

Vulnerability from cvelistv5 – Published: 2024-09-13 05:29 – Updated: 2025-11-03 22:16
VLAI?
Title
selinux,smack: don't bypass permissions check in inode_setsecctx hook
Summary
In the Linux kernel, the following vulnerability has been resolved: selinux,smack: don't bypass permissions check in inode_setsecctx hook Marek Gresko reports that the root user on an NFS client is able to change the security labels on files on an NFS filesystem that is exported with root squashing enabled. The end of the kerneldoc comment for __vfs_setxattr_noperm() states: * This function requires the caller to lock the inode's i_mutex before it * is executed. It also assumes that the caller will make the appropriate * permission checks. nfsd_setattr() does do permissions checking via fh_verify() and nfsd_permission(), but those don't do all the same permissions checks that are done by security_inode_setxattr() and its related LSM hooks do. Since nfsd_setattr() is the only consumer of security_inode_setsecctx(), simplest solution appears to be to replace the call to __vfs_setxattr_noperm() with a call to __vfs_setxattr_locked(). This fixes the above issue and has the added benefit of causing nfsd to recall conflicting delegations on a file when a client tries to change its security label.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 18032ca062e621e15683cb61c066ef3dc5414a7b , < 2dbc4b7bac60b02cc6e70d05bf6a7dfd551f9dda (git)
Affected: 18032ca062e621e15683cb61c066ef3dc5414a7b , < fe0cd53791119f6287b6532af8ce41576d664930 (git)
Affected: 18032ca062e621e15683cb61c066ef3dc5414a7b , < eebec98791d0137e455cc006411bb92a54250924 (git)
Affected: 18032ca062e621e15683cb61c066ef3dc5414a7b , < 459584258d47ec3cc6245a82e8a49c9d08eb8b57 (git)
Affected: 18032ca062e621e15683cb61c066ef3dc5414a7b , < f71ec019257ba4f7ab198bd948c5902a207bad96 (git)
Affected: 18032ca062e621e15683cb61c066ef3dc5414a7b , < 76a0e79bc84f466999fa501fce5bf7a07641b8a7 (git)
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    Linux Linux Affected: 3.11
Unaffected: 0 , < 3.11 (semver)
Unaffected: 5.10.227 , ≤ 5.10.* (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.49 , ≤ 6.6.* (semver)
Unaffected: 6.10.8 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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