SECUFOCUSNOW
Home›CVE index›CVE-2026-64096
Review reviewHigh

CVE-2026-64096

Linux

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. Th...

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

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. Th...

Affected product and versions

Product
Linux
Affected versions
>= ab49886e3da73b6b35ece21006e191910427bb30 < ff3a4487ead475e27b43280b8ee3d8464fe280e1, >= ab49886e3da73b6b35ece21006e191910427bb30 < 78a63fb2f7d5630d1c1f2859a20d4e4226863b41, >= ab49886e3da73b6b35ece21006e191910427bb30 < ced48f55bac73f0822eae90509e51b42b4f646c8, >= ab49886e3da73b6b35ece21006e191910427bb30 < 70bcb678561f0fb58f33270fc73f12f3be72b878, >= ab49886e3da73b6b35ece21006e191910427bb30 < aef897c9d2dd0d9339167fb82b62beff68d076cb, >= ab49886e3da73b6b35ece21006e191910427bb30 < 8a3707653ab658e082ccd992e92594e01b09a3fc, >= ab49886e3da73b6b35ece21006e191910427bb30 < edfb1e094104a50f931553dc82ac59246569fd32, >= ab49886e3da73b6b35ece21006e191910427bb30 < 20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc, >= 3.15
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available