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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

20 Jul 2026, 15:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 8.8

19 Jul 2026, 16:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-19 16:17

Updated : 2026-07-20 15:17

NVD link : CVE-2026-64096

Mitre link : CVE-2026-64096

CVE.ORG link : CVE-2026-64096

JSON object : View

Products Affected

No product.

CWE

No CWE.

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Concurrent RCU\nreaders may still accesses references to those entries at the point of\nremoval. RCU-protected readers trying to operate on entries like\norig->mcast_want_all_ipv6_node will then access already freed memory.\n\nFix this by moving batadv_mcast_purge_orig() to batadv_orig_node_release(),\njust before the call_rcu() invocation. This ensures RCU readers that were\nactive at purge time have drained before the orig_node memory is reclaimed."}], "lastModified": "2026-07-20T15:17:08.673", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}