CVE-2026-98256 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in signal handling caused by race conditions during exec() in __send_signal_locked, letting attackers cause kernel memory corruption, exploit requires triggering non-leader execve with posix timer signals.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.13% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
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
6 October 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for exec() race in signal 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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