CVE-2026-89731 Linux Kernel - Out-of-Bounds Read

Linux kernel contains an out-of-bounds read vulnerability in cxl_rch_get_aer_info() caused by reading beyond the physical AER register block due to struct size mismatch, letting attackers cause out-of-bounds memory access, exploit requires local code execution.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.16% 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:L/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 cxl_rch_get_aer_info() out-of-bounds read.

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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