LINUX Kernel BAT IV Neigh Node Pointer Leak in batman-adv
CVE-2026-46238 Published on May 28, 2026
batman-adv: stop caching unowned originator pointers in BAT IV
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]
Products Associated with CVE-2026-46238
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Affected Versions
Linux:- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below aafcbaf1159ea224528ca4075d0ba8c10ef374af is affected.
- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below 6e20700f8c524ac379ba8274ff5d453023b7c006 is affected.
- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below 09dc0d1a12222ffca6481916eab3cfea477b9620 is affected.
- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below 67bceeb22207f1f5a402973a3a0809e5f2698f38 is affected.
- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below f03e8583532941b07761c5429de7d50766fa3110 is affected.
- Version 2.6.38 is affected.
- Before 2.6.38 is unaffected.
- Version 6.6.140, <= 6.6.* is unaffected.
- Version 6.12.90, <= 6.12.* is unaffected.
- Version 6.18.32, <= 6.18.* is unaffected.
- Version 7.0.9, <= 7.0.* is unaffected.
- Version 7.1-rc4, <= * is unaffected.