CVE-2026-64255

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-24. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 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

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:

wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers

Three BA session handlers use ffs(ba_data->sta_mask) - 1 to derive a station ID without checking that sta_mask is non-zero. When sta_mask is zero, ffs() returns 0 and the subtraction wraps to 0xFFFFFFFF, causing an out-of-bounds access on fw_id_to_link_sta[].

Add WARN_ON_ONCE(!ba_data->sta_mask) guards before each ffs() call, consistent with the existing check in iwl_mld_ampdu_rx_start().

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
13%
KEV
Not listed

Published

July 24, 2026

Last Modified

August 17, 2026

Advisory Details (3)

Auto-updated Jul 27, 2026
No patch confirmed yet.
generic

wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f056fc2b927448d37eca6b6cacc3d1b0f67b20d2
generic

wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc
generic

wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1de92789ce31e46fa7e7d8e89c90b19cdb1c103b

Vendor Advisories for CVE-2026-64255(2)

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

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.2~rc5-1~exp1 (160 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (153 versions)7.1.3-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 117× 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 147 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-64255?
CVE-2026-64255 is a high vulnerability published on July 24, 2026. In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers Three BA session handlers use ffs(badata->stamask) - 1 to derive a station ID without checking that stamask is non-zero. When stamask is zero, ffs() returns…
When was CVE-2026-64255 disclosed?
CVE-2026-64255 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64255 actively exploited?
CVE-2026-64255 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 87.2% of all scored CVEs.
What is the CVSS score of CVE-2026-64255?
CVE-2026-64255 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-64255?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64255, 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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