PT-2026-27746 · Linux · Linux Kernel
Published
2026-01-01
·
Updated
2026-04-23
·
CVE-2026-23381
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A flaw exists in the Linux kernel's bridge networking component. When the system boots with IPv6 disabled ('ipv6.disable=1'), the neighbor discovery table (
nd tbl) is not initialized. Subsequently, if neighbor suppression is enabled and an ICMPv6 Neighbor Discovery packet is received by the bridge, a NULL pointer dereference occurs when attempting to access the uninitialized nd tbl via the neigh lookup() function. This can lead to a kernel panic. The issue arises from the use of IS ENABLED(IPV6) which is replaced with ipv6 mod enabled() in the callers to disable NS/NA suppression when IPv6 is disabled.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel