CVE-2026-64089

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-19. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

batman-adv: tt: fix negative last_changeset_len

batadv_piv_tt::last_changeset_len len was declared as s16, but the field is never intended to hold a negative value. When a value greater than 32767 is assigned, it wraps to a negative signed integer.

In batadv_send_my_tt_response(), last_changeset_len is temporarily widened to s32. The incorrectly negative s16 value propagates into the s32, causing batadv_tt_prepare_tvlv_local_data() to allocate a full sized buffer but populates only a small portion of it with the collected changeset. All remaining bits are kept uninitialized.

Using an u16 avoids this type confusion and ensures that no (negative) sign extension is performed in batadv_send_my_tt_response().

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%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 11, 2026

Advisory Details (8)

Auto-updated Aug 25, 2026
No patch confirmed yet.
generic

batman-adv: tt: fix negative last_changeset_len - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fc92cdfcb295cefa4344d71a527d61b638b7bfc4
generic

batman-adv: tt: fix negative last_changeset_len - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/eb235472b52ef36981c5aad330485eaf2382c53b
generic

batman-adv: tt: fix negative last_changeset_len - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d29abf70c665730e249d2ec8e1402095ae26bcee
generic

batman-adv: tt: fix negative last_changeset_len - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c424e8519ac78eac5d9f4eecf06208a0d619ec14
generic

batman-adv: tt: fix negative last_changeset_len - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6314089acf0ddf64376fdc0b1420695504c73f52
generic

batman-adv: tt: fix negative last_changeset_len - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/55dc41fe8821e9a849e147255ad572bc933a9d15
generic

batman-adv: tt: fix negative last_changeset_len - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/22d59c72f4a47ffec121d0610f70d0d70c3c11c8
generic

batman-adv: tt: fix negative last_changeset_len - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/179eb62506a02d00370bd6478898cb632e10986c

Vendor Advisories for CVE-2026-64089(1)

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

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.186.196~20.04.1) @ focal2026-08-30ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-08-30ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-08-30ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-08-30ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-30ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-08-30ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-30ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-08-30ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-08-30ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-08-30ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-08-30ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-08-30ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-08-30ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-08-30ubuntu

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

(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 (138 versions)7.0.12-1—

All Vendor Advisories

(16)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 57× in last 7d / 347× 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 430 total refreshes for this CVE.

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

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-64089?
CVE-2026-64089 is a critical vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix negative lastchangesetlen batadvpivtt::lastchangesetlen len was declared as s16, but the field is never intended to hold a negative value. When a value greater than 32767 is assigned, it wraps to a negative…
When was CVE-2026-64089 disclosed?
CVE-2026-64089 was first published in the National Vulnerability Database on July 19, 2026, with the most recent update on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64089 actively exploited?
CVE-2026-64089 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.3% of all scored CVEs.
What is the CVSS score of CVE-2026-64089?
CVE-2026-64089 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-64089?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64089, 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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