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CVE-2026-99129

kernel: kernel: Security bypass via race condition in SELinux BPF token validation

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Severity

Moderate

Red Hat Product Security

6.3

CVSS 3.1

Review impact separately from score.

Published · October 28, 2026

Updated · October 30, 2026

Description

A flaw was found in the Linux kernel. A local user could exploit a time-of-check to time-of-use (TOCTOU) race condition during Security-Enhanced Linux (SELinux) permission checks for Berkeley Packet Filter (BPF) tokens. By altering a token file descriptor between kernel lookups, an attacker could bypass access control restrictions and perform unauthorized BPF operations.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.3
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition