CVE-2026-64088

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

batman-adv: tt: fix negative tt_buff_len

batadv_orig_node::tt_buff_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_other_tt_response(), tt_buff_len is temporarily widened to s32. The incorrectly negative s16 value propagates into the s32, causing batadv_tt_prepare_tvlv_global_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_other_tt_response().

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 11, 2026

Advisory Details (8)

Auto-updated Jul 20, 2026
No patch confirmed yet.
generic

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

https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1
generic

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

https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4
generic

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

https://git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2
generic

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

https://git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd
generic

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

https://git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47
generic

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

https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496
generic

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

https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430
generic

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

https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767

Vendor Advisories for CVE-2026-64088(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-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-08-30ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-08-30ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-08-30ubuntu
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-azure-fde-lts-22.04 (5.15.0.1117.126) @ 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-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-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-08-30ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-08-30ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-08-30ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ 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 31× in last 7d / 171× 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 226 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64088?
CVE-2026-64088 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix negative ttbufflen batadvorignode::ttbufflen 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…
When was CVE-2026-64088 disclosed?
CVE-2026-64088 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-2026-64088 actively exploited?
CVE-2026-64088 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 79.8% of all scored CVEs.
What is the CVSS score of CVE-2026-64088?
CVE-2026-64088 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-64088?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64088, 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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