CVE-2026-64096

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: mcast: fix use-after-free in orig_node RCU release batadv_mcast_purge_orig() removes entries from RCU-protected hlists but does not wait for an RCU grace period before returning. Concurrent RCU readers may still accesses references to those entries at the point of removal. RCU-protected readers trying to operate on entries like orig->mcast_want_all_ipv6_node will then access already freed memory. Fix this by moving batadv_mcast_purge_orig() to batadv_orig_node_release(), just before the call_rcu() invocation. This ensures RCU readers that were active at purge time have drained before the orig_node memory is reclaimed.

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References

Other References

https://git.kernel.org/stable/c/20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc https://git.kernel.org/stable/c/70bcb678561f0fb58f33270fc73f12f3be72b878 https://git.kernel.org/stable/c/78a63fb2f7d5630d1c1f2859a20d4e4226863b41 https://git.kernel.org/stable/c/8a3707653ab658e082ccd992e92594e01b09a3fc https://git.kernel.org/stable/c/aef897c9d2dd0d9339167fb82b62beff68d076cb https://git.kernel.org/stable/c/ced48f55bac73f0822eae90509e51b42b4f646c8 https://git.kernel.org/stable/c/edfb1e094104a50f931553dc82ac59246569fd32 https://git.kernel.org/stable/c/ff3a4487ead475e27b43280b8ee3d8464fe280e1

Frequently Asked Questions

What is CVE-2026-64096? +

In the Linux kernel, the following vulnerability has been resolved: batman-adv: mcast: fix use-after-free in orig_node RCU release batadv_mcast_purge_orig() removes entries from RCU-protected hlists but does not wait for an RCU grace period before returning. Concurrent RCU readers may still accesses references to those entries at the point of removal. RCU-protected readers trying to operate on entries like orig->mcast_want_all_ipv6_node will then access already freed memory. Fix this by moving batadv_mcast_purge_orig() to batadv_orig_node_release(), just before the call_rcu() invocation. This ensures RCU readers that were active at purge time have drained before the orig_node memory is reclaimed.

How do I check if I'm vulnerable to CVE-2026-64096? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-64096

Description

References

Other References

Frequently Asked Questions

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