CVE-2026-46238

batman-adv: stop caching unowned originator pointers in BAT IV

State: Published
Severity: 8.8 High
Published: May 28, 2026
Updated: Aug 5, 2026
Reserved: May 13, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

batman-adv: stop caching unowned originator pointers in BAT IV

BAT IV keeps the last-hop neighbor address in each neigh_node, but some paths also cache an originator pointer derived from a temporary lookup. That pointer is not owned by the neigh_node and may no longer refer to a live originator entry after purge handling runs.

Stop storing the auxiliary originator pointer in the BAT IV neighbor state. When BAT IV needs the neighbor originator data, resolve it from the stored neighbor address and drop the reference again after use.

[sven: avoid bonding logic for outgoing OGM]

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 86b2b58d7c228d850c8c78e4144e6123e8ed2718Affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 384e3050a42be9085d50507b4d5f8266a588d742Affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 8c16c68fdbb69778f8d04f650340c3f4d1518f8eAffected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before aafcbaf1159ea224528ca4075d0ba8c10ef374afAffected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 6e20700f8c524ac379ba8274ff5d453023b7c006Affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 09dc0d1a12222ffca6481916eab3cfea477b9620Affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 67bceeb22207f1f5a402973a3a0809e5f2698f38Affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before f03e8583532941b07761c5429de7d50766fa3110Affected
LinuxLinux	2.6.38Affected before 2.6.38Not affected 5.10.258 through 5.10.Not affected 5.15.209 through 5.15.Not affected 6.1.175 through 6.1.Not affected 6.6.140 through 6.6.Not affected 6.12.90 through 6.12.Not affected 6.18.32 through 6.18.Not affected 7.0.9 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 86b2b58d7c228d850c8c78e4144e6123e8ed2718Affected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 384e3050a42be9085d50507b4d5f8266a588d742Affected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 8c16c68fdbb69778f8d04f650340c3f4d1518f8eAffected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before aafcbaf1159ea224528ca4075d0ba8c10ef374afAffected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 6e20700f8c524ac379ba8274ff5d453023b7c006Affected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 09dc0d1a12222ffca6481916eab3cfea477b9620Affected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 67bceeb22207f1f5a402973a3a0809e5f2698f38Affected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before f03e8583532941b07761c5429de7d50766fa3110Affected

LinuxLinux

2.6.38Affected
before 2.6.38Not affected
5.10.258 through 5.10.*Not affected
5.15.209 through 5.15.*Not affected
6.1.175 through 6.1.*Not affected
6.6.140 through 6.6.*Not affected
6.12.90 through 6.12.*Not affected
6.18.32 through 6.18.*Not affected
7.0.9 through 7.0.*Not affected
7.1 and laterNot affected

References

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