CVE-2026-64096
batman-adv: mcast: fix use-after-free in orig_node RCU release
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
3.15
References 8
git.kernel.org
- stable/c/ff3a4487ead475e27b43280b8ee3d8464fe280e1
- stable/c/78a63fb2f7d5630d1c1f2859a20d4e4226863b41
- stable/c/ced48f55bac73f0822eae90509e51b42b4f646c8
- stable/c/70bcb678561f0fb58f33270fc73f12f3be72b878
- stable/c/aef897c9d2dd0d9339167fb82b62beff68d076cb
- stable/c/8a3707653ab658e082ccd992e92594e01b09a3fc
- stable/c/edfb1e094104a50f931553dc82ac59246569fd32
- stable/c/20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc