CVE-2026-89778 Linux Kernel - Out-of-Bounds Read

Linux kernel contains an out-of-bounds read vulnerability in isofs due to incorrect page array access on empty zisofs blocks, letting local attackers cause memory corruption via crafted ISO9660 images, exploit requires crafted ISO9660 image.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.70% 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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
16 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for zisofs empty block handling.

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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