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Vulnerability record · CVE-2026-53130 · published 24 June 2026

CVE-2026-53130: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.19% · top 92.6% CWE-191 · CWE-191
7.8CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
6 Jul 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-53130), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.