nilfs2: fix inode number range checks

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-42105
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-07-30 08:15:03 UTC
Updated2026-08-04 11:19:34 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nilfs2: fix inode number range checks Patch series "nilfs2: fix potential issues related to reserved inodes". This series fixes one use-after-free issue reported by syzbot, caused by nilfs2's internal inode being exposed in the namespace on a corrupted filesystem, and a couple of flaws that cause problems if the starting number of non-reserved inodes written in the on-disk super block is intentionally (or corruptly) changed from its default value. This patch (of 3): In the current implementation of nilfs2, "nilfs->ns_first_ino", which gives the first non-reserved inode number, is read from the superblock, but its lower limit is not checked. As a result, if a number that overlaps with the inode number range of reserved inodes such as the root directory or metadata files is set in the super block parameter, the inode number test macros (NILFS_MDT_INODE and NILFS_VALID_INODE) will not function properly. In addition, these test macros use left bit-shift calculations using with the inode number as the shift count via the BIT macro, but the result of a shift calculation that exceeds the bit width of an integer is undefined in the C specification, so if "ns_first_ino" is set to a large value other than the default value NILFS_USER_INO (=11), the macros may potentially malfunction depending on the environment. Fix these issues by checking the lower bound of "nilfs->ns_first_ino" and by preventing bit shifts equal to or greater than the NILFS_USER_INO constant in the inode number test macros. Also, change the type of "ns_first_ino" from signed integer to unsigned integer to avoid the need for type casting in comparisons such as the lower bound check introduced this time.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

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 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f 57235c3c88bb430043728d0d02f44a4efe386476 git Not specified
CNA Linux Linux affected 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f 08cab183a624ba71603f3754643ae11cab34dbc4 git Not specified
CNA Linux Linux affected 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f 731011ac6c37cbe97ece229fc6daa486276052c5 git Not specified
CNA Linux Linux affected 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f 3be4dcc8d7bea52ea41f87aa4bbf959efe7a5987 git Not specified
CNA Linux Linux affected 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f fae1959d6ab2c52677b113935e36ab4e25df37ea git Not specified
CNA Linux Linux affected 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f 9194f8ca57527958bee207919458e372d638d783 git Not specified
CNA Linux Linux affected 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f 1c91058425a01131ea30dda6cf43c67b17884d6a git Not specified
CNA Linux Linux affected 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f e2fec219a36e0993642844be0f345513507031f4 git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 4.19.318 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.280 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.222 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.163 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.98 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.39 6.6.* semver Not specified
CNA Linux Linux unaffected 6.9.9 6.9.* semver Not specified
CNA Linux Linux unaffected 6.10 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fae1959d6ab2c52677b113935e36ab4e25df37ea af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/57235c3c88bb430043728d0d02f44a4efe386476 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/1c91058425a01131ea30dda6cf43c67b17884d6a af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/731011ac6c37cbe97ece229fc6daa486276052c5 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/9194f8ca57527958bee207919458e372d638d783 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/08cab183a624ba71603f3754643ae11cab34dbc4 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/e2fec219a36e0993642844be0f345513507031f4 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/3be4dcc8d7bea52ea41f87aa4bbf959efe7a5987 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
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