CVE-2026-31659

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: 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:

batman-adv: reject oversized global TT response buffers

batadv_tt_prepare_tvlv_global_data() builds the allocation length for a global TT response in 16-bit temporaries. When a remote originator advertises a large enough global TT, the TT payload length plus the VLAN header offset can exceed 65535 and wrap before kmalloc().

The full-table response path still uses the original TT payload length when it fills tt_change, so the wrapped allocation is too small and batadv_tt_prepare_tvlv_global_data() writes past the end of the heap object before the later packet-size check runs.

Fix this by rejecting TT responses whose TVLV value length cannot fit in the 16-bit TVLV payload length field.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

April 24, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

batman-adv: reject oversized global TT response buffers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3a359bf5c61d52e7f09754108309d637532164a6
generic

batman-adv: reject oversized global TT response buffers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cf2199171ef799ca7270019125f4a91bd20ad4d9
generic

batman-adv: reject oversized global TT response buffers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/de6c1dc3c7d01a152607e6fcecee4d5288283f10
generic

batman-adv: reject oversized global TT response buffers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f970646b9a39539d1bac86822ac78b5915455ea9
generic

batman-adv: reject oversized global TT response buffers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/69d61639bc7e963c3b645e570279d731e7c89062
generic

batman-adv: reject oversized global TT response buffers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/95c71365a2222908441b54d6f2c315e0c79fcec3
generic

batman-adv: reject oversized global TT response buffers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2997f4bd1f982e7013709946e00be89b507693fa
generic

batman-adv: reject oversized global TT response buffers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7e5d007e0df946bffb8542fb112e0044014a5897

Vendor Advisories for CVE-2026-31659(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.10.253—osv

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 rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)5.10.257-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)6.1.170-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (127 versions)6.19.13-1—

Additional Vendor Advisories

(24)

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 5× in last 7d / 34× 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 408 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-31659?
CVE-2026-31659 is a critical vulnerability published on April 24, 2026. In the Linux kernel, the following vulnerability has been resolved: batman-adv: reject oversized global TT response buffers batadvttpreparetvlvglobal_data() builds the allocation length for a global TT response in 16-bit temporaries. When a remote originator advertises a large enough global TT, the…
When was CVE-2026-31659 disclosed?
CVE-2026-31659 was first published in the National Vulnerability Database on April 24, 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-2026-31659 actively exploited?
CVE-2026-31659 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 66.5% of all scored CVEs.
What is the CVSS score of CVE-2026-31659?
CVE-2026-31659 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-31659?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31659, 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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