ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63870
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 15:16:53 UTC
Updated2026-07-20 15:16:52 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() The aoe driver (or similar) generates a non-IPv6 packet (e.g., ETH_P_AOE) and queues it for transmission via dev_queue_xmit() on a 6LoWPAN interface (configured by the user or test case). Since the packet is not IPv6, the 6LoWPAN header_ops->create function (lowpan_header_create or header_create) returns early without initializing the lowpan_addr_info structure in the skb headroom. In the transmit function (lowpan_xmit), the driver calls lowpan_header (or setup_header) which unconditionally copies and uses the lowpan_addr_info from the headroom, which contains uninitialized data. Fix this by dropping non IPv6 packets. A similar fix is needed in net/bluetooth/6lowpan.c bt_xmit().

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001680000 probability, percentile 0.064990000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a af07fffbd53ddc3ec3c2a4ca914f27899fa89bca git Not specified
CNA Linux Linux affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a 3150e6d3223dfc356308125cabf9c34169842d2a git Not specified
CNA Linux Linux affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a 8da95cb6ad7d656c871e776a9c7b77e894d6d89c git Not specified
CNA Linux Linux affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a 1a827b95e62b4cbe851ae7cc9c961cdfa769cca4 git Not specified
CNA Linux Linux affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a c1819c8defa235c7beda859bc185b1c429a55ecd git Not specified
CNA Linux Linux affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a 285b0842f2e01c3edf805f1fd64da11d9b7f6b4c git Not specified
CNA Linux Linux affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a 87172cc8dc49aaf54407a31edffb0232f8cb93ab git Not specified
CNA Linux Linux affected 4dc315e267fe4a3c863fec21f26aa0a418c3f07a 3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3 git Not specified
CNA Linux Linux affected 4.0 Not specified
CNA Linux Linux unaffected 4.0 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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