CVE-2024-42105: Linux kernel · nilfs2: fix inode number range checks
Source GCVE Database
Not known to be exploited · CVSS 7.8 High.
Data as of 29 Oct 2026, 22:52 UTC
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 30 Jul 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
Description
In 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.
References
- nvd.nist.gov/vuln/detail/CVE-2024-42105 (opens in a new tab)
- git.kernel.org/stable/c/08cab183a624ba71603f3754643ae11cab34dbc4 (opens in a new tab)
- git.kernel.org/stable/c/1c91058425a01131ea30dda6cf43c67b17884d6a (opens in a new tab)
- git.kernel.org/stable/c/3be4dcc8d7bea52ea41f87aa4bbf959efe7a5987 (opens in a new tab)
- git.kernel.org/stable/c/57235c3c88bb430043728d0d02f44a4efe386476 (opens in a new tab)
- git.kernel.org/stable/c/731011ac6c37cbe97ece229fc6daa486276052c5 (opens in a new tab)
- git.kernel.org/stable/c/9194f8ca57527958bee207919458e372d638d783 (opens in a new tab)
- git.kernel.org/stable/c/e2fec219a36e0993642844be0f345513507031f4 (opens in a new tab)
- git.kernel.org/stable/c/fae1959d6ab2c52677b113935e36ab4e25df37ea (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/01/msg00001.html (opens in a new tab)