CVE-2026-97489Hinoki check available

Kernel crash via unchecked block-size failure

Published Sep 24, 2026 · Updated Sep 24, 2026

Denial of service in the BFS filesystem in Linux allows local users to crash the kernel while mounting a block device. bfs_fill_super ignores a failed sb_set_blocksize call and proceeds to sb_bread with an oversized block size, triggering a BUG_ON in folio_set_bh. Triggering the crash requires permission to mount BFS on a block device whose logical block size prevents switching to 512 bytes; no data access or modification is reported.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in the BFS filesystem in Linux allows local users to crash the kernel while mounting a block device. bfs_fill_super ignores a failed sb_set_blocksize call and proceeds to sb_bread with an oversized block size, triggering a BUG_ON in folio_set_bh. Triggering the crash requires permission to mount BFS on a block device whose logical block size prevents switching to 512 bytes; no data access or modification is reported.

The record

CVE
CVE-2026-97489
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <6.12.111
  2. Affected versionversion=0 <6.18.53
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2430e3380936df0b648af720cae624eef035a2d1
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7cc713b29eecc0189a184e82f42d174fddaa9e1e
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ab1d6160d26e6ee8939e994999be9b45e90a42ef

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0 <6.12.111; version=0 <6.18.53; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2430e3380936df0b648af720cae624eef035a2d1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7cc713b29eecc0189a184e82f42d174fddaa9e1e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ab1d6160d26e6ee8939e994999be9b45e90a42ef

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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