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Vulnerability record · CVE-2026-64096 · published 19 July 2026

CVE-2026-64096: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

8.8 CVSS 3.1 High EPSS 0.40% · top 68.3% CWE-416 · Use after free
8.8CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
11 Aug 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-64096), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.