CVE-2026-99233 Linux Kernel - Broken Access Control

Linux kernel contains a broken access control vulnerability caused by improper verification of event_call identity in tracing/histograms, letting attackers cause use-after-free by manipulating synthetic event reference counts, exploit requires histogram registration on non-synthetic events with matching basename.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
View the NVD record ↗

Details

Type
Broken Access Control
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2 November 2026
Updated
3 November 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for event_call identity verification.

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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