CVE-2026-90203 Linux Kernel Squashfs - Out of Bounds Read

Linux kernel Squashfs contains an out of bounds read caused by lack of negative offset validation in decompressed fragment block, letting attackers with CAP_SYS_ADMIN mount crafted filesystems and trigger out of bounds access.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Read
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version with the fix applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs