In the Linux kernel, the following vulnerability has been resolved: batman-adv: mcast: fix use-after-free in orig_node RCU release… (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.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel's batman-adv multicast subsystem involves a use-after-free condition during orig_node RCU release. Specifically, batadv_mcast_purge_orig() removes entries from RCU-protected hlists but does not wait for an RCU grace period before returning. This allows concurrent RCU readers to access references to freed memory, such as orig->mcast_want_all_ipv6_node. The fix relocates the purge call to batadv_orig_node_release(), just before call_rcu(), ensuring that all RCU readers active at purge time have completed before the orig_node memory is reclaimed.
Potential Impact
Concurrent RCU readers may access freed memory, potentially causing kernel crashes or undefined behavior. This can affect system stability and reliability but no specific exploit or privilege escalation details are provided.
Mitigation Recommendations
A fix has been implemented in the Linux kernel by moving the batadv_mcast_purge_orig() call to ensure proper synchronization with RCU readers before memory is freed. Users should apply the official Linux kernel updates that include this fix. Patch status is not explicitly confirmed in the provided data; check the vendor advisory for current remediation guidance.
In the Linux kernel, the following vulnerability has been resolved: batman-adv: mcast: fix use-after-free in orig_node RCU release… (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.
CVSS v3.1
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel's batman-adv multicast subsystem involves a use-after-free condition during orig_node RCU release. Specifically, batadv_mcast_purge_orig() removes entries from RCU-protected hlists but does not wait for an RCU grace period before returning. This allows concurrent RCU readers to access references to freed memory, such as orig->mcast_want_all_ipv6_node. The fix relocates the purge call to batadv_orig_node_release(), just before call_rcu(), ensuring that all RCU readers active at purge time have completed before the orig_node memory is reclaimed.
Potential Impact
Concurrent RCU readers may access freed memory, potentially causing kernel crashes or undefined behavior. This can affect system stability and reliability but no specific exploit or privilege escalation details are provided.
Mitigation Recommendations
A fix has been implemented in the Linux kernel by moving the batadv_mcast_purge_orig() call to ensure proper synchronization with RCU readers before memory is freed. Users should apply the official Linux kernel updates that include this fix. Patch status is not explicitly confirmed in the provided data; check the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-jhvq-hvr2-2mgr
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64096"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27a82a4a8d598912b566
Added to database: 07/19/2026, 19:38:16 UTC
Last enriched: 07/19/2026, 19:47:52 UTC
Last updated: 07/20/2026, 19:41:21 UTC
Views: 14
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