CVE-2026-64096 Details
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.
A use-after-free vulnerability has been identified in the Linux kernel's batman-adv module, specifically within the multicast handling of originator nodes. The issue arises because the function batadv_mcast_purge_orig() removes entries from RCU-protected linked lists without waiting for an RCU grace period to expire. This oversight allows concurrent RCU readers to access references to the removed entries, leading to the potential for reading freed memory. The vulnerability affects several versions of the Linux kernel that include the batman-adv module with multicast support for IPv4 link-local and IPv6 link-local all-nodes.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. The official Linux kernel Git repository can be checked out for the latest stable releases.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc | kernel.org | Patch |
| https://git.kernel.org/stable/c/70bcb678561f0fb58f33270fc73f12f3be72b878 | kernel.org | Patch |
| https://git.kernel.org/stable/c/78a63fb2f7d5630d1c1f2859a20d4e4226863b41 | kernel.org | Patch |
| https://git.kernel.org/stable/c/8a3707653ab658e082ccd992e92594e01b09a3fc | kernel.org | Patch |
| https://git.kernel.org/stable/c/aef897c9d2dd0d9339167fb82b62beff68d076cb | kernel.org | Patch |
| https://git.kernel.org/stable/c/ced48f55bac73f0822eae90509e51b42b4f646c8 | kernel.org | Patch |
| https://git.kernel.org/stable/c/edfb1e094104a50f931553dc82ac59246569fd32 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ff3a4487ead475e27b43280b8ee3d8464fe280e1 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 3.15, < 5.10.258 >= 5.11, < 5.15.209 >= 5.16, < 6.1.175 >= 6.2, < 6.6.142 >= 6.7, < 6.12.92 >= 6.13, < 6.18.34 >= 6.19, < 7.0.11 7.1 rc1 7.1 rc2 7.1 rc3 7.1 rc4 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 11, 2026 | Initial Analysis | [email protected] |
| Jul 20, 2026 | CVE Modified | kernel.org |
| Jul 19, 2026 | New CVE Received | kernel.org |