PT-2025-49430 · Linux+3 · Linux Kernel+3
Published
2025-12-08
·
Updated
2026-04-20
·
CVE-2025-40297
CVSS v2.0
6.0
Medium
| Vector | AV:L/AC:H/Au:S/C:C/I:C/A:C |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The Linux kernel contains a use-after-free issue within the networking bridge component. This flaw arises from a race condition during the deletion of a forwarding database (fdb) entry, specifically when Multiple Spanning Tree (MST) is enabled and VLAN filtering is disabled. The issue occurs because MST can bypass a port's disabled state, allowing fdb learning to occur while the port is being deleted, leading to a use-after-free condition. The fix introduces a check for the port's VLAN group, which is set to NULL during deletion, to prevent the state bypass.
Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Debian
Linuxmint
Linux Kernel
Ubuntu