CVE-2025-68774Network attack vector

Kernel crash via missing HFS+ bnode reference

Published Jan 13, 2026 · Updated Jan 13, 2026

Race condition in the Linux kernel HFS+ filesystem allows remote attackers to crash the kernel by racing sync and link operations. In __hfs_bnode_create, the losing thread reuses a newly hashed bnode without calling hfs_bnode_get, leaving two callers sharing refcnt=1. Reachability requires attacker-controlled filesystem activity on a mounted HFS+ volume; the later double put reaches BUG_ON and stops the kernel.

CVSS severity7.5
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel HFS+ filesystem allows remote attackers to crash the kernel by racing sync and link operations. In __hfs_bnode_create, the losing thread reuses a newly hashed bnode without calling hfs_bnode_get, leaving two callers sharing refcnt=1. Reachability requires attacker-controlled filesystem activity on a mounted HFS+ volume; the later double put reaches BUG_ON and stops the kernel.

The record

CVE
CVE-2025-68774
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <152af114287851583cf7e0abc10129941f19466a
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <457f795e7abd7770de10216d7f9994a3f12a56d6
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5882e7c8cdbb5e254a69628b780acff89c78071e
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b68dc4134b18a3922cd33439ec614aad4172bc86
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b9d1c6bb5f19460074ce9862cb80be86b5fb0a50

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <152af114287851583cf7e0abc10129941f19466a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <457f795e7abd7770de10216d7f9994a3f12a56d6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5882e7c8cdbb5e254a69628b780acff89c78071e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b68dc4134b18a3922cd33439ec614aad4172bc86; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b9d1c6bb5f19460074ce9862cb80be86b5fb0a50

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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