Veille CVE
CVE-2026-53130
7.8 ÉlevéeDescription
In the Linux kernel, the following vulnerability has been resolved: fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START omfs_fill_super() rejects oversized s_sys_blocksize values (> PAGE_SIZE), but it does not reject values smaller than OMFS_DIR_START (0x1b8 = 440). Later, omfs_make_empty() uses sbi->s_sys_blocksize - OMFS_DIR_START as the length argument to memset(). Since s_sys_blocksize is u32, a crafted filesystem image with s_sys_blocksize < OMFS_DIR_START causes an unsigned underflow there, wrapping to a value near 2^32. That drives a ~4 GiB memset() from bh->b_data + OMFS_DIR_START and overwrites kernel memory far beyond the backing block buffer. Add the corresponding lower-bound check alongside the existing upper-bound check in omfs_fill_super(), so that malformed images are rejected during superblock validation before any filesystem data is processed.
Produits concernés
Scores CVSS
| Version | Score | Source | Vecteur |
|---|---|---|---|
| 3.1 | 7.8 Élevée | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Faiblesses (CWE)
Références
- https://git.kernel.org/stable/c/0621c385fda1376e967f37ccd534c26c3e511d14 Patch
- https://git.kernel.org/stable/c/131ea3e57fc22936ed0e2c8330f2e36106172f51 Patch
- https://git.kernel.org/stable/c/5822a05a841a10794ad818620dd2af490b0705d3 Patch
- https://git.kernel.org/stable/c/6561afc38398e3518a29c5eebb975c30468f98a6 Patch
- https://git.kernel.org/stable/c/754ff1bea3819a90c6f33cccfc1a299ef7609f07 Patch
- https://git.kernel.org/stable/c/79f84af38c9fef9deb0e02c79eb969b5541c2644 Patch
- https://git.kernel.org/stable/c/817f16ed62bc58a168417bfb5e859c2a370bab03 Patch
- https://git.kernel.org/stable/c/fbc72f5c645155dc2ed3573243ed20f9913e3a54 Patch