CVE-2026-53130
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.
Affected versions
Linux kernel versions
2.6.27
and later are affected. Fixed in
5.10.258,
5.15.209,
6.1.175,
6.6.141,
6.12.91,
6.18.33,
7.0.10,
7.1
and their respective stable series.
References
8 totalFrequently asked questions
-
What is CVE-2026-53130?
CVE-2026-53130 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 2.6.27 onward and has been patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-53130 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
-
Is there a patch available for CVE-2026-53130?
Yes — CVE-2026-53130 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 2.6.27 or later up to the fix versions, apply the relevant patch for your kernel branch.
-
Is CVE-2026-53130 actively exploited?
No — CVE-2026-53130 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.