CVE-2026-89723 Linux Kernel - Out of Bounds Read/Write

Linux kernel contains a slab-out-of-bounds vulnerability in nilfs_direct_propagate caused by improper cleanup of intermediate B-tree node blocks after file truncation, letting attackers trigger out-of-bounds memory access, exploit requires triggering file truncation.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version containing the fix for nilfs2 slab-out-of-bounds issue.

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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