CVE-2026-52946

kernel: fs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · June 24, 2026

Updated · August 5, 2026

Description

A flaw was found in the Linux kernel. A lock order deadlock can occur in the send_sigio() and send_sigurg() functions when a process group receives a signal. This vulnerability, caused by an unsafe lock order during software interrupts (SOFTIRQ) in asynchronous I/O (fasync) signaling, could allow a remote attacker to trigger a system deadlock by sending specially crafted TCP URG packets. This can lead to a denial of service (DoS) condition, making the system unresponsive.

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 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-833 · Deadlock