CVE-2024-26981: nilfs2: fix OOB in nilfs_set_de_type
First published: Wed May 01 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix OOB in nilfs_set_de_type The size of the nilfs_type_by_mode array in the fs/nilfs2/dir.c file is defined as "S_IFMT >> S_SHIFT", but the nilfs_set_de_type() function, which uses this array, specifies the index to read from the array in the same way as "(mode & S_IFMT) >> S_SHIFT". static void nilfs_set_de_type(struct nilfs_dir_entry *de, struct inode *inode) { umode_t mode = inode->i_mode; de->file_type = nilfs_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; // oob } However, when the index is determined this way, an out-of-bounds (OOB) error occurs by referring to an index that is 1 larger than the array size when the condition "mode & S_IFMT == S_IFMT" is satisfied. Therefore, a patch to resize the nilfs_type_by_mode array should be applied to prevent OOB errors.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=2.6.30<4.19.313 | |
| Linux Kernel | >=4.20<5.4.275 | |
| Linux Kernel | >=5.5<5.10.216 | |
| Linux Kernel | >=5.11<5.15.157 | |
| Linux Kernel | >=5.16<6.1.88 | |
| Linux Kernel | >=6.2<6.6.29 | |
| Linux Kernel | >=6.7<6.8.8 | |
| Linux Kernel | =6.9-rc1 | |
| Linux Kernel | =6.9-rc2 | |
| Linux Kernel | =6.9-rc3 | |
| Linux Kernel | =6.9-rc4 | |
| Debian Linux | =10.0 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.25-1 6.12.27-1 |
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Reference Links
- https://git.kernel.org/stable/c/054f29e9ca05be3906544c5f2a2c7321c30a4243
- https://git.kernel.org/stable/c/2382eae66b196c31893984a538908c3eb7506ff9
- https://git.kernel.org/stable/c/7061c7efbb9e8f11ce92d6b4646405ea2b0b4de1
- https://git.kernel.org/stable/c/897ac5306bbeb83e90c437326f7044c79a17c611
- https://git.kernel.org/stable/c/90823f8d9ecca3d5fa6b102c8e464c62f416975f
- https://git.kernel.org/stable/c/90f43980ea6be4ad903e389be9a27a2a0018f1c8
- https://git.kernel.org/stable/c/bdbe483da21f852c93b22557b146bc4d989260f0
- https://git.kernel.org/stable/c/c4a7dc9523b59b3e73fd522c73e95e072f876b16
- https://launchpad.net/bugs/cve/CVE-2024-26981
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26981
- https://nvd.nist.gov/vuln/detail/CVE-2024-26981
- https://security-tracker.debian.org/tracker/CVE-2024-26981
- https://ubuntu.com/security/CVE-2024-26981
- https://git.kernel.org/linus/c4a7dc9523b59b3e73fd522c73e95e072f876b16
Frequently Asked Questions
What is the severity of CVE-2024-26981?
CVE-2024-26981 is classified as a moderate severity vulnerability due to potential out-of-bounds access in the nilfs2 file system.
How do I fix CVE-2024-26981?
To fix CVE-2024-26981, upgrade to the stable Linux kernel versions 5.10.223-1, 5.10.226-1, 6.1.123-1, 6.1.119-1, 6.12.10-1, or 6.12.11-1.
What systems are affected by CVE-2024-26981?
CVE-2024-26981 affects various Linux kernel versions ranging from 2.6.30 to 6.9-rc4.
Is CVE-2024-26981 present in Linux distributions?
Yes, CVE-2024-26981 is present in multiple Linux distributions that utilize vulnerable versions of the Linux kernel.
What type of vulnerability is CVE-2024-26981?
CVE-2024-26981 is an out-of-bounds access vulnerability affecting the nilfs2 filesystem in the Linux kernel.
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