batman-adv: mcast: fix use-after-free in orig_node RCU release

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64096
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:50 UTC
Updated2026-08-11 16:10:37 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002550000 probability, percentile 0.170830000 (date 2026-08-02)

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ab49886e3da73b6b35ece21006e191910427bb30 ff3a4487ead475e27b43280b8ee3d8464fe280e1 git Not specified
CNA Linux Linux affected ab49886e3da73b6b35ece21006e191910427bb30 78a63fb2f7d5630d1c1f2859a20d4e4226863b41 git Not specified
CNA Linux Linux affected ab49886e3da73b6b35ece21006e191910427bb30 ced48f55bac73f0822eae90509e51b42b4f646c8 git Not specified
CNA Linux Linux affected ab49886e3da73b6b35ece21006e191910427bb30 70bcb678561f0fb58f33270fc73f12f3be72b878 git Not specified
CNA Linux Linux affected ab49886e3da73b6b35ece21006e191910427bb30 aef897c9d2dd0d9339167fb82b62beff68d076cb git Not specified
CNA Linux Linux affected ab49886e3da73b6b35ece21006e191910427bb30 8a3707653ab658e082ccd992e92594e01b09a3fc git Not specified
CNA Linux Linux affected ab49886e3da73b6b35ece21006e191910427bb30 edfb1e094104a50f931553dc82ac59246569fd32 git Not specified
CNA Linux Linux affected ab49886e3da73b6b35ece21006e191910427bb30 20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc git Not specified
CNA Linux Linux affected 3.15 Not specified
CNA Linux Linux unaffected 3.15 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ced48f55bac73f0822eae90509e51b42b4f646c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/edfb1e094104a50f931553dc82ac59246569fd32 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8a3707653ab658e082ccd992e92594e01b09a3fc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/70bcb678561f0fb58f33270fc73f12f3be72b878 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/78a63fb2f7d5630d1c1f2859a20d4e4226863b41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/aef897c9d2dd0d9339167fb82b62beff68d076cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ff3a4487ead475e27b43280b8ee3d8464fe280e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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