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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 8.8 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.26% probability · 17th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/20c2d6a20ca936f5aaa6dd40f73f262ac45c87ccPatch
- https://git.kernel.org/stable/c/70bcb678561f0fb58f33270fc73f12f3be72b878Patch
- https://git.kernel.org/stable/c/78a63fb2f7d5630d1c1f2859a20d4e4226863b41Patch
- https://git.kernel.org/stable/c/8a3707653ab658e082ccd992e92594e01b09a3fcPatch
- https://git.kernel.org/stable/c/aef897c9d2dd0d9339167fb82b62beff68d076cbPatch
- https://git.kernel.org/stable/c/ced48f55bac73f0822eae90509e51b42b4f646c8Patch
- https://git.kernel.org/stable/c/edfb1e094104a50f931553dc82ac59246569fd32Patch
- https://git.kernel.org/stable/c/ff3a4487ead475e27b43280b8ee3d8464fe280e1Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.