CVE-2026-23342
kernel: bpf: Fix race in cpumap on PREEMPT_RT
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Severity
UnknownRed Hat Product Security
CVSS
Review impact separately from score.
Published · March 25, 2026
Updated · June 28, 2026
Description
A flaw was found in the Linux kernel. On systems configured with PREEMPT_RT, a race condition exists within the Berkeley Packet Filter (BPF) cpumap functionality. This flaw allows a local attacker to trigger concurrent access to the xdp_bulk_queue. Successful exploitation can lead to a kernel crash, resulting in a Denial of Service (DoS).
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition