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.
References
Configurations
Configuration 1 (hide)
|
History
06 Jul 2026, 15:26
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-191 | |
| First Time |
Linux linux Kernel
Linux |
|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| References | () https://git.kernel.org/stable/c/0621c385fda1376e967f37ccd534c26c3e511d14 - Patch | |
| References | () https://git.kernel.org/stable/c/131ea3e57fc22936ed0e2c8330f2e36106172f51 - Patch | |
| References | () https://git.kernel.org/stable/c/5822a05a841a10794ad818620dd2af490b0705d3 - Patch | |
| References | () https://git.kernel.org/stable/c/6561afc38398e3518a29c5eebb975c30468f98a6 - Patch | |
| References | () https://git.kernel.org/stable/c/754ff1bea3819a90c6f33cccfc1a299ef7609f07 - Patch | |
| References | () https://git.kernel.org/stable/c/79f84af38c9fef9deb0e02c79eb969b5541c2644 - Patch | |
| References | () https://git.kernel.org/stable/c/817f16ed62bc58a168417bfb5e859c2a370bab03 - Patch | |
| References | () https://git.kernel.org/stable/c/fbc72f5c645155dc2ed3573243ed20f9913e3a54 - Patch |
28 Jun 2026, 08:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
24 Jun 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-06-24 17:17
Updated : 2026-07-06 15:26
NVD link : CVE-2026-53130
Mitre link : CVE-2026-53130
CVE.ORG link : CVE-2026-53130
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-191
Integer Underflow (Wrap or Wraparound)