CVE-2026-63989
kernel: bridge: Fix sleep in atomic context in netlink path
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 19, 2026
Updated · October 9, 2026
Description
A flaw was found in the Linux kernel's bridge module. When configuring network bridge ports, a critical function was incorrectly holding a lock during an operation that could cause the system to pause unexpectedly. This can lead to a kernel crash, making the system unavailable and resulting in a Denial of Service (DoS).
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 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-617 · Reachable Assertion