CVE-2026-64096 (CVSS 8.8)

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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CVSS v3.1 Score

8.8

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0026

Probability of exploitation

0.17%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

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. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-64096? +

CVE-2026-64096 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0026, placing it in the 0th percentile for exploitation probability.

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