CVE-2026-89954Hinoki check available

Out-of-bounds access via unchecked AFS metadata

Published Sep 16, 2026 · Updated Sep 16, 2026

Improper input validation in the Linux kernel AFS v2 parser allows attackers to trigger out-of-bounds memory access via crafted flash metadata. The afs_parse_v2_partition function subtracts footer[8] from erase-block bounds and walks region_count entries in a fixed imginfo array without validating either flash-controlled value. Reachability requires an MTD device containing attacker-controlled AFS v2 image data to be parsed; the public patch does not state a further impact.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper input validation in the Linux kernel AFS v2 parser allows attackers to trigger out-of-bounds memory access via crafted flash metadata. The afs_parse_v2_partition function subtracts footer[8] from erase-block bounds and walks region_count entries in a fixed imginfo array without validating either flash-controlled value. Reachability requires an MTD device containing attacker-controlled AFS v2 image data to be parsed; the public patch does not state a further impact.

The record

CVE
CVE-2026-89954
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.2
  2. Affected versionversion=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <18916f475057cbd2fb8ea6ae86e6b85884ad1d53
  3. Affected versionversion=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <1bec05a68414cf8d0cab6cb42445b8603f32ffc4
  4. Affected versionversion=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <1edea8900ca3e405c1421d8b5c29f97107874f72
  5. Affected versionversion=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <3ad8ff12fd44b08af9212ac4883a7e29d2ab7348
  6. Affected versionversion=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <875daa3c750814ff2e2dc050239c390048f0bcd0
  7. Affected versionversion=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <d14e6298139f58a87a87d7022e26a7f37f0ddce7
  8. Affected versionversion=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <da740539e8f370767317e24615349b9342a6e773
  9. Affected versionversion=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <e9290031f736e99ad17c25c00311c92c266843b7

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.2; version=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <18916f475057cbd2fb8ea6ae86e6b85884ad1d53; version=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <1bec05a68414cf8d0cab6cb42445b8603f32ffc4; version=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <1edea8900ca3e405c1421d8b5c29f97107874f72; version=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <3ad8ff12fd44b08af9212ac4883a7e29d2ab7348; version=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <875daa3c750814ff2e2dc050239c390048f0bcd0; version=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <d14e6298139f58a87a87d7022e26a7f37f0ddce7; version=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <da740539e8f370767317e24615349b9342a6e773; version=b7cf5e2830bbb128699d7635ce8404b7f605bc95 <e9290031f736e99ad17c25c00311c92c266843b7

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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