CVE-2026-89720 Linux Kernel - Out-of-Bounds Read

Linux kernel contains an out-of-bounds read vulnerability in ubifs due to incorrect bounds check in ubifs_sb_verify_signature(), letting attackers with crafted signed UBIFS images cause memory read beyond allocation, exploit requires crafted UBIFS image.

CVSS base score 7.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version containing the fix for ubifs signature length check.

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

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