selinux,smack: don't bypass permissions check in inode_setsecctx hook

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-46695
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-09-13 06:15:14 UTC
Updated2026-08-04 11:20:15 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from [email protected]

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

Problem Types: CWE-276

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 18032ca062e621e15683cb61c066ef3dc5414a7b 2dbc4b7bac60b02cc6e70d05bf6a7dfd551f9dda git Not specified
CNA Linux Linux affected 18032ca062e621e15683cb61c066ef3dc5414a7b fe0cd53791119f6287b6532af8ce41576d664930 git Not specified
CNA Linux Linux affected 18032ca062e621e15683cb61c066ef3dc5414a7b eebec98791d0137e455cc006411bb92a54250924 git Not specified
CNA Linux Linux affected 18032ca062e621e15683cb61c066ef3dc5414a7b 459584258d47ec3cc6245a82e8a49c9d08eb8b57 git Not specified
CNA Linux Linux affected 18032ca062e621e15683cb61c066ef3dc5414a7b f71ec019257ba4f7ab198bd948c5902a207bad96 git Not specified
CNA Linux Linux affected 18032ca062e621e15683cb61c066ef3dc5414a7b 76a0e79bc84f466999fa501fce5bf7a07641b8a7 git Not specified
CNA Linux Linux affected 3.11 Not specified
CNA Linux Linux unaffected 3.11 semver Not specified
CNA Linux Linux unaffected 5.10.227 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.168 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.113 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.49 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.8 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/03/msg00002.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/eebec98791d0137e455cc006411bb92a54250924 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2dbc4b7bac60b02cc6e70d05bf6a7dfd551f9dda 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f71ec019257ba4f7ab198bd948c5902a207bad96 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fe0cd53791119f6287b6532af8ce41576d664930 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/459584258d47ec3cc6245a82e8a49c9d08eb8b57 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/76a0e79bc84f466999fa501fce5bf7a07641b8a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
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