CVE-2026-64096

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxab49886e3da73b6b35ece21006e191910427bb30 < ff3a4487ead475e27b43280b8ee3d8464fe280e1affected
LinuxLinuxab49886e3da73b6b35ece21006e191910427bb30 < 78a63fb2f7d5630d1c1f2859a20d4e4226863b41affected
LinuxLinuxab49886e3da73b6b35ece21006e191910427bb30 < ced48f55bac73f0822eae90509e51b42b4f646c8affected
LinuxLinuxab49886e3da73b6b35ece21006e191910427bb30 < 70bcb678561f0fb58f33270fc73f12f3be72b878affected
LinuxLinuxab49886e3da73b6b35ece21006e191910427bb30 < aef897c9d2dd0d9339167fb82b62beff68d076cbaffected
LinuxLinuxab49886e3da73b6b35ece21006e191910427bb30 < 8a3707653ab658e082ccd992e92594e01b09a3fcaffected
LinuxLinuxab49886e3da73b6b35ece21006e191910427bb30 < edfb1e094104a50f931553dc82ac59246569fd32affected
LinuxLinuxab49886e3da73b6b35ece21006e191910427bb30 < 20c2d6a20ca936f5aaa6dd40f73f262ac45c87ccaffected
LinuxLinux3.15affected
LinuxLinux0 < 3.15unaffected
LinuxLinux5.10.258 <= 5.10.*unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.142 <= 6.6.*unaffected
LinuxLinux6.12.92 <= 6.12.*unaffected
LinuxLinux6.18.34 <= 6.18.*unaffected
LinuxLinux7.0.11 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References