CVE-2026-63870

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In 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().

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Jul 21, 2026
No patch confirmed yet.
generic

ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd
generic

ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bca
generic

ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89c
generic

ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93ab
generic

ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3
generic

ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2a
generic

ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4c
generic

ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4

Vendor Advisories for CVE-2026-63870(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (142 versions)7.0.13-1—

Data Freshness Timeline

(refreshed 20× in last 7d / 105× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 232 total refreshes for this CVE.

  1. 2026-08-30 02:59 UTCEG score recompute
  2. 2026-08-30 02:59 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-28 02:42 UTCEG score recompute
  6. 2026-08-28 02:42 UTCGHSA enrichment
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-27 13:44 UTCGHSA enrichment
  9. 2026-08-27 00:44 UTCEG score recompute
  10. 2026-08-27 00:44 UTCGHSA enrichment
  11. 2026-08-26 14:46 UTCEPSS rescore
  12. 2026-08-26 11:46 UTCGHSA enrichment
  13. 2026-08-25 22:45 UTCEG score recompute
  14. 2026-08-25 22:45 UTCGHSA enrichment
  15. 2026-08-25 13:49 UTCEPSS rescore
  16. 2026-08-25 09:47 UTCGHSA enrichment
  17. 2026-08-24 20:47 UTCEG score recompute
  18. 2026-08-24 20:47 UTCGHSA enrichment
  19. 2026-08-24 07:48 UTCGHSA enrichment
  20. 2026-08-23 18:13 UTCGHSA enrichment
  21. 2026-08-23 05:14 UTCGHSA enrichment
  22. 2026-08-22 16:15 UTCGHSA enrichment
  23. 2026-08-22 03:12 UTCEG score recompute
  24. 2026-08-22 03:12 UTCGHSA enrichment
  25. 2026-08-21 23:49 UTCEPSS rescore
Show 75 more
  1. 2026-08-21 14:12 UTCGHSA enrichment
  2. 2026-08-21 01:13 UTCEG score recompute
  3. 2026-08-21 01:13 UTCGHSA enrichment
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 12:14 UTCGHSA enrichment
  6. 2026-08-19 23:12 UTCEG score recompute
  7. 2026-08-19 23:12 UTCGHSA enrichment
  8. 2026-08-19 17:04 UTCEPSS rescore
  9. 2026-08-19 08:50 UTCGHSA enrichment
  10. 2026-08-18 19:50 UTCEG score recompute
  11. 2026-08-18 19:50 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 01:54 UTCEG score recompute
  14. 2026-08-18 01:54 UTCGHSA enrichment
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-17 11:47 UTCGHSA enrichment
  17. 2026-08-16 22:41 UTCEG score recompute
  18. 2026-08-16 22:41 UTCGHSA enrichment
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 09:42 UTCEG score recompute
  21. 2026-08-16 09:42 UTCGHSA enrichment
  22. 2026-08-15 20:44 UTCGHSA enrichment
  23. 2026-08-15 07:45 UTCEG score recompute
  24. 2026-08-15 07:45 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
  26. 2026-08-14 18:46 UTCGHSA enrichment
  27. 2026-08-14 05:48 UTCEG score recompute
  28. 2026-08-14 05:48 UTCGHSA enrichment
  29. 2026-08-13 22:00 UTCEPSS rescore
  30. 2026-08-13 16:49 UTCGHSA enrichment
  31. 2026-08-13 03:27 UTCGHSA enrichment
  32. 2026-08-12 14:28 UTCEG score recompute
  33. 2026-08-12 14:28 UTCGHSA enrichment
  34. 2026-08-12 13:51 UTCEPSS rescore
  35. 2026-08-12 01:27 UTCEG score recompute
  36. 2026-08-12 01:27 UTCGHSA enrichment
  37. 2026-08-11 12:28 UTCEG score recompute
  38. 2026-08-11 12:28 UTCGHSA enrichment
  39. 2026-08-11 00:00 UTCEPSS rescore
  40. 2026-08-10 23:24 UTCGHSA enrichment
  41. 2026-08-10 10:26 UTCGHSA enrichment
  42. 2026-08-09 21:27 UTCEG score recompute
  43. 2026-08-09 21:27 UTCGHSA enrichment
  44. 2026-08-09 13:47 UTCEPSS rescore
  45. 2026-08-09 08:29 UTCGHSA enrichment
  46. 2026-08-08 19:31 UTCEG score recompute
  47. 2026-08-08 19:31 UTCGHSA enrichment
  48. 2026-08-08 16:37 UTCEPSS rescore
  49. 2026-08-08 06:32 UTCGHSA enrichment
  50. 2026-08-07 17:34 UTCEG score recompute
  51. 2026-08-07 17:34 UTCGHSA enrichment
  52. 2026-08-07 04:35 UTCGHSA enrichment
  53. 2026-08-06 15:37 UTCEG score recompute
  54. 2026-08-06 15:37 UTCGHSA enrichment
  55. 2026-08-06 13:47 UTCEPSS rescore
  56. 2026-08-06 02:28 UTCEG score recompute
  57. 2026-08-06 02:28 UTCGHSA enrichment
  58. 2026-08-05 19:17 UTCEPSS rescore
  59. 2026-08-05 19:17 UTCEPSS rescore
  60. 2026-08-05 13:29 UTCEG score recompute
  61. 2026-08-05 13:29 UTCGHSA enrichment
  62. 2026-08-05 10:06 UTCGHSA enrichment
  63. 2026-08-04 21:07 UTCEG score recompute
  64. 2026-08-04 21:07 UTCGHSA enrichment
  65. 2026-08-04 15:10 UTCEPSS rescore
  66. 2026-08-04 10:39 UTCEPSS rescore
  67. 2026-08-04 07:48 UTCGHSA enrichment
  68. 2026-08-03 18:49 UTCEG score recompute
  69. 2026-08-03 18:49 UTCGHSA enrichment
  70. 2026-08-03 10:36 UTCEPSS rescore
  71. 2026-08-03 05:51 UTCGHSA enrichment
  72. 2026-08-02 16:47 UTCGHSA enrichment
  73. 2026-08-02 03:49 UTCEG score recompute
  74. 2026-08-02 03:49 UTCGHSA enrichment
  75. 2026-08-02 02:27 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-63870?
CVE-2026-63870 is a high vulnerability published on July 19, 2026. In 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., ETHPAOE) and queues it for transmission via devqueuexmit() on a 6LoWPAN interface (configured by the user…
When was CVE-2026-63870 disclosed?
CVE-2026-63870 was first published in the National Vulnerability Database on July 19, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63870 actively exploited?
CVE-2026-63870 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.8% of all scored CVEs.
What is the CVSS score of CVE-2026-63870?
CVE-2026-63870 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-63870?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63870, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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