CVE-2026-89954

HIGHPre-NVD 8.08.0—
EchelonGraph scoreHIGH confidence

Score 8.0 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. A secondary CVSS source baseline 8.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

mtd: afs: validate v2 image info bounds

The AFS v2 parser uses footer[8] to locate the image information block inside the current erase block, then uses the image information region_count to walk entries from a fixed local array. The footer offset and region count come from flash contents and are not checked against the erase block or the local image-info array before use.

Reject v2 entries whose image information offset would underflow the erase block calculation, and reject region counts that cannot fit in the local image-info array before walking region entries.

CVSS v3
8.0
EG Score
8.0HIGHhigh confidence
EG Risk
41
EG Risk 41/100CISA SSVC

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
Severity80% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 16, 2026

Last Modified

September 16, 2026

Advisory Details (8)

Auto-updated Sep 16, 2026
Patch available.
generic

mtd: afs: validate v2 image info bounds - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7
generic

mtd: afs: validate v2 image info bounds - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773
generic

mtd: afs: validate v2 image info bounds - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7
generic

mtd: afs: validate v2 image info bounds - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/875daa3c750814ff2e2dc050239c390048f0bcd0
generic

mtd: afs: validate v2 image info bounds - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3ad8ff12fd44b08af9212ac4883a7e29d2ab7348
generic

mtd: afs: validate v2 image info bounds - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1edea8900ca3e405c1421d8b5c29f97107874f72
generic

mtd: afs: validate v2 image info bounds - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1bec05a68414cf8d0cab6cb42445b8603f32ffc4
generic

mtd: afs: validate v2 image info bounds - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/18916f475057cbd2fb8ea6ae86e6b85884ad1d53

Vendor Advisories for CVE-2026-89954(1)

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

Affected Packages

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (360 versions)
  • every version on: no fix on record
—
linux-6.126.12.100-1~deb12u1, 6.12.101-1~deb12u1, 6.12.107-1~deb12u1
  • every version up to 6.12.111-1~deb12u1: fixed in 6.12.111-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (35 versions)
  • every version up to 6.12.111-1: fixed in 6.12.111-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (179 versions)
  • every version up to 7.2.6-1: fixed in 7.2.6-1
—

Data Freshness Timeline

(refreshed 26× in last 7d / 83× 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.

  1. 2026-10-05 05:57 UTCEG score recompute
  2. 2026-10-05 05:57 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 19:06 UTCGHSA enrichment
  5. 2026-10-04 08:06 UTCGHSA enrichment
  6. 2026-10-03 21:16 UTCEG score recompute
  7. 2026-10-03 21:16 UTCGHSA enrichment
  8. 2026-10-03 10:25 UTCGHSA enrichment
  9. 2026-10-02 23:34 UTCEG score recompute
  10. 2026-10-02 23:34 UTCGHSA enrichment
  11. 2026-10-02 12:25 UTCGHSA enrichment
  12. 2026-10-02 01:30 UTCEG score recompute
  13. 2026-10-02 01:30 UTCGHSA enrichment
  14. 2026-10-01 19:51 UTCEPSS rescore
  15. 2026-10-01 14:39 UTCGHSA enrichment
  16. 2026-10-01 03:49 UTCGHSA enrichment
  17. 2026-09-30 16:58 UTCEG score recompute
  18. 2026-09-30 16:58 UTCGHSA enrichment
  19. 2026-09-30 15:04 UTCEPSS rescore
  20. 2026-09-30 05:34 UTCGHSA enrichment
  21. 2026-09-29 18:42 UTCEG score recompute
  22. 2026-09-29 18:42 UTCGHSA enrichment
  23. 2026-09-29 07:48 UTCEG score recompute
  24. 2026-09-29 07:48 UTCGHSA enrichment
  25. 2026-09-28 20:58 UTCEG score recompute
Show 58 more
  1. 2026-09-28 20:58 UTCGHSA enrichment
  2. 2026-09-28 13:52 UTCEPSS rescore
  3. 2026-09-28 13:52 UTCEPSS rescore
  4. 2026-09-28 10:07 UTCGHSA enrichment
  5. 2026-09-27 23:14 UTCEG score recompute
  6. 2026-09-27 23:14 UTCGHSA enrichment
  7. 2026-09-27 13:49 UTCEPSS rescore
  8. 2026-09-27 12:23 UTCGHSA enrichment
  9. 2026-09-27 01:32 UTCEG score recompute
  10. 2026-09-27 01:32 UTCGHSA enrichment
  11. 2026-09-26 15:59 UTCEPSS rescore
  12. 2026-09-26 14:38 UTCGHSA enrichment
  13. 2026-09-26 03:34 UTCEG score recompute
  14. 2026-09-26 03:34 UTCGHSA enrichment
  15. 2026-09-25 16:38 UTCGHSA enrichment
  16. 2026-09-25 05:47 UTCGHSA enrichment
  17. 2026-09-24 18:56 UTCEG score recompute
  18. 2026-09-24 18:56 UTCGHSA enrichment
  19. 2026-09-24 14:04 UTCEPSS rescore
  20. 2026-09-24 08:05 UTCGHSA enrichment
  21. 2026-09-23 21:15 UTCEG score recompute
  22. 2026-09-23 21:15 UTCGHSA enrichment
  23. 2026-09-23 17:54 UTCEPSS rescore
  24. 2026-09-23 10:24 UTCGHSA enrichment
  25. 2026-09-22 23:34 UTCEG score recompute
  26. 2026-09-22 23:33 UTCGHSA enrichment
  27. 2026-09-22 16:01 UTCEPSS rescore
  28. 2026-09-22 12:38 UTCGHSA enrichment
  29. 2026-09-22 01:47 UTCEG score recompute
  30. 2026-09-22 01:47 UTCGHSA enrichment
  31. 2026-09-21 21:09 UTCEPSS rescore
  32. 2026-09-21 14:54 UTCGHSA enrichment
  33. 2026-09-21 03:54 UTCEG score recompute
  34. 2026-09-21 03:54 UTCGHSA enrichment
  35. 2026-09-20 20:16 UTCEPSS rescore
  36. 2026-09-20 17:02 UTCGHSA enrichment
  37. 2026-09-20 06:10 UTCGHSA enrichment
  38. 2026-09-19 19:19 UTCEG score recompute
  39. 2026-09-19 19:19 UTCGHSA enrichment
  40. 2026-09-19 08:28 UTCGHSA enrichment
  41. 2026-09-18 21:37 UTCEG score recompute
  42. 2026-09-18 21:37 UTCGHSA enrichment
  43. 2026-09-18 19:28 UTCEPSS rescore
  44. 2026-09-18 10:47 UTCGHSA enrichment
  45. 2026-09-17 23:56 UTCEG score recompute
  46. 2026-09-17 23:56 UTCGHSA enrichment
  47. 2026-09-17 19:32 UTCEPSS rescore
  48. 2026-09-17 13:05 UTCGHSA enrichment
  49. 2026-09-17 02:14 UTCEG score recompute
  50. 2026-09-17 02:14 UTCGHSA enrichment
  51. 2026-09-16 15:23 UTCEG score recompute
  52. 2026-09-16 15:23 UTCGHSA enrichment
  53. 2026-09-16 14:47 UTCEG score recompute▲ 8.00
  54. 2026-09-16 14:47 UTCGHSA enrichment
  55. 2026-09-16 14:45 UTCMITRE cvelistV5CVSS v3 → 8 · severity → HIGH
  56. 2026-09-16 11:21 UTCNVD update
  57. 2026-09-16 10:38 UTCEG score recompute
  58. 2026-09-16 10:36 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-89954?
CVE-2026-89954 is a high vulnerability published on September 16, 2026. In the Linux kernel, the following vulnerability has been resolved: mtd: afs: validate v2 image info bounds The AFS v2 parser uses footer[8] to locate the image information block inside the current erase block, then uses the image information region_count to walk entries from a fixed local array.…
When was CVE-2026-89954 disclosed?
CVE-2026-89954 was first published on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89954 actively exploited?
CVE-2026-89954 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-89954?
CVE-2026-89954 has a CVSS base score of 8.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-89954?
A fix for CVE-2026-89954 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-89954 are linked in the Vendor Advisories panel on this page.

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