batman-adv: fix stale receive device on merged fragments

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89951
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:17:05 UTC
Updated2026-09-16 15:18:19 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: batman-adv: fix stale receive device on merged fragments Fragment reassembly reuses the skb from the highest-numbered buffered fragment as the merged packet. When that fragment was received on a hard interface which is deleted before the chain completes, the merged skb can re-enter the receive path with a stale skb->dev and skb_iif. batadv_batman_skb_recv() passes such merged packets through the normal receive handlers again. DAT and bridge loop avoidance both derive the ARP header length from skb->dev, so they can dereference the freed net_device before the packet reaches the local mesh interface. Refresh the receive device metadata from the current receive device before running the packet handlers. This keeps internally reinjected merged fragments consistent with the normal receive path after hard interface teardown.

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 63d86250fa7cbe22451369bd1c0881dfc8190958 git Not specified
CNA Linux Linux affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 f830c2dfc1431764db9256b3d5db1695fc9a7f56 git Not specified
CNA Linux Linux affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 f4b4ae763b5d59319fad62a00c76676758e7dafa git Not specified
CNA Linux Linux affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 6df64825f8b199921120c685af2abca14b077331 git Not specified
CNA Linux Linux affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 a2c272da99c2077088083c14961cf2f1e4506995 git Not specified
CNA Linux Linux affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 e91d2cc7441d89a45bad73ad9789159c7441cb80 git Not specified
CNA Linux Linux affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 2dffc8c44b6e3347b3719c6419c07b4a18fea895 git Not specified
CNA Linux Linux affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 ad46c907d7d9975a285c1e89a4adde652eaa93f5 git Not specified
CNA Linux Linux affected 3.13 Not specified
CNA Linux Linux unaffected 3.13 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6df64825f8b199921120c685af2abca14b077331 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ad46c907d7d9975a285c1e89a4adde652eaa93f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f830c2dfc1431764db9256b3d5db1695fc9a7f56 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2dffc8c44b6e3347b3719c6419c07b4a18fea895 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e91d2cc7441d89a45bad73ad9789159c7441cb80 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a2c272da99c2077088083c14961cf2f1e4506995 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f4b4ae763b5d59319fad62a00c76676758e7dafa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/63d86250fa7cbe22451369bd1c0881dfc8190958 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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