CVE-2026-97926Hinoki check available

Kernel out-of-bounds access via malformed UFS metadata

Published Sep 25, 2026 · Updated Sep 25, 2026

Out-of-bounds access in Linux UFS allows local users with CAP_SYS_ADMIN to corrupt kernel memory by mounting a crafted image. ufs_read_cylinder() caches cg_cgx and rotor fields from on-disk cylinder groups without checking their group number or bounds, and allocation later uses them as array and bitmap indices. Exploitation requires a privileged UFS mount followed by an allocation, so the flaw does not cross an unprivileged security boundary.

CVSS severityUnavailable
Unscored
EPSS probability0.15%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds access in Linux UFS allows local users with CAP_SYS_ADMIN to corrupt kernel memory by mounting a crafted image. ufs_read_cylinder() caches cg_cgx and rotor fields from on-disk cylinder groups without checking their group number or bounds, and allocation later uses them as array and bitmap indices. Exploitation requires a privileged UFS mount followed by an allocation, so the flaw does not cross an unprivileged security boundary.

The record

CVE
CVE-2026-97926
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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?

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  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5902a95066883cf96fa15b2680694fc5dd0c7d11
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <87b12dc360a002eb2d498aa4f01e84347019612d
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <abde9eb33106850dfa367ad3965d3588bb8558d5
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c9d263be26806d388129fab8c6904bed197fc6af
  5. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5902a95066883cf96fa15b2680694fc5dd0c7d11; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <87b12dc360a002eb2d498aa4f01e84347019612d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <abde9eb33106850dfa367ad3965d3588bb8558d5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c9d263be26806d388129fab8c6904bed197fc6af; version=2.6.12

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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
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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