CVE-2026-97927Hinoki check available

Kernel crash via premature root dentry publication

Published Sep 25, 2026 · Updated Sep 25, 2026

NULL pointer dereference in the Linux UFS driver allows local users with CAP_SYS_ADMIN to crash the kernel by mounting a crafted image. ufs_fill_super() publishes sb->s_root before ufs_read_cylinder_structures() succeeds, then failure clears sb->s_fs_info while teardown still dereferences UFS_SB(sb). The path requires a writable UFS mount of an image with an unreadable first cylinder group; UFS is not unprivileged-mountable, so the result is a host kernel oops rather than privilege gain.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

NULL pointer dereference in the Linux UFS driver allows local users with CAP_SYS_ADMIN to crash the kernel by mounting a crafted image. ufs_fill_super() publishes sb->s_root before ufs_read_cylinder_structures() succeeds, then failure clears sb->s_fs_info while teardown still dereferences UFS_SB(sb). The path requires a writable UFS mount of an image with an unreadable first cylinder group; UFS is not unprivileged-mountable, so the result is a host kernel oops rather than privilege gain.

The record

CVE
CVE-2026-97927
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
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 <55a4c98abb9694b067c6a031d11501f06b6b523c
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <785e523b6c1931d802cab9f85912f3e6c7028af1
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8173e051a8acbb4ae6547be0436727944119e0b5
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a9804121d55aaa4319c1cac00b99794aa177dd6a
  5. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <55a4c98abb9694b067c6a031d11501f06b6b523c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <785e523b6c1931d802cab9f85912f3e6c7028af1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8173e051a8acbb4ae6547be0436727944119e0b5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a9804121d55aaa4319c1cac00b99794aa177dd6a; 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.

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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

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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