CVE-2026-53263

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-06-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

6lowpan: fix off-by-one in multicast context address compression

The second memcpy in lowpan_iphc_mcast_ctx_addr_compress() uses &data[1] as destination and &ipaddr->s6_addr[11] as source, but both should be offset by one: &data[2] and &ipaddr->s6_addr[12] respectively.

This off-by-one has two consequences:

  • data[1] is overwritten with s6_addr[11], corrupting the RIID
field in the compressed multicast address
  • data[5] is never written, so uninitialized kernel stack memory
is transmitted over the network via lowpan_push_hc_data(), leaking kernel stack contents

The correct inline data layout must match what the decompression function lowpan_uncompress_multicast_ctx_daddr() expects: data[0..1] = s6_addr[1..2] (flags/scope + RIID) data[2..5] = s6_addr[12..15] (group ID)

Also zero-initialize the data array as a defensive measure against similar bugs in the future.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

Published

June 25, 2026

Last Modified

July 8, 2026

Advisory Details (8)

Auto-updated Jul 8, 2026
Patch available.
generic

6lowpan: fix off-by-one in multicast context address compression - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f24a58c72a45f4c109f3557a760cc4b60b7a6037
generic

6lowpan: fix off-by-one in multicast context address compression - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af
generic

6lowpan: fix off-by-one in multicast context address compression - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/da8cbb64b47e9066b40af0de170901caf17b768c
generic

6lowpan: fix off-by-one in multicast context address compression - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/da8808463882c3f3c357b072e25053c2121f1419
generic

6lowpan: fix off-by-one in multicast context address compression - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c32f30ef5e66adbfa102348e2e8a23776eb007cb
generic

6lowpan: fix off-by-one in multicast context address compression - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4485d79617520d84ba5a14515e2b5136007d6deb
generic

6lowpan: fix off-by-one in multicast context address compression - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2a58899d11009bffc7b4b32a571858f381121837
generic

6lowpan: fix off-by-one in multicast context address compression - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/06ce6fc106b16dec9b535950db626261be865e5b

Vendor Advisories for CVE-2026-53263(2)

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

Patch Availability(10)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-23ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1019.19) @ resolute2026-09-23ubuntu
ubuntulinux-tools-ibm-7.0 (7.0.0-1013.13) @ resolute2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2018.18) @ resolute2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18) @ resolute2026-09-23ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1011.11) @ resolute2026-09-23ubuntu
ubuntulinux-tools-azure-edge (7.0.0-1014.14~24.04.1) @ noble2026-09-23ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)
  • every version up to 5.10.259-1: fixed in 5.10.259-1
—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)
  • every version up to 6.1.176-1~deb11u1: fixed in 6.1.176-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)
  • every version up to 6.1.176-1: fixed in 6.1.176-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)
  • every version up to 6.12.94-1: fixed in 6.12.94-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (146 versions)
  • every version up to 7.0.13-1: fixed in 7.0.13-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(10)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 33× 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 224 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-53263?
CVE-2026-53263 is a medium vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: 6lowpan: fix off-by-one in multicast context address compression The second memcpy in lowpaniphcmcastctxaddr_compress() uses &data[1] as destination and &ipaddr->s6_addr[11] as source, but both should be offset by one: &data[2] and…
When was CVE-2026-53263 disclosed?
CVE-2026-53263 was first published on June 25, 2026, with the most recent update on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53263 actively exploited?
CVE-2026-53263 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53263?
CVE-2026-53263 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-53263?
A fix for CVE-2026-53263 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53263 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-53263

Explore →

Is Your Infrastructure Affected by CVE-2026-53263?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs