CVE-2025-68771

Local kernel panic via unchecked OCFS2 chain index

Published Jan 13, 2026 · Updated Jan 13, 2026

Denial of service in Linux Kernel OCFS2 allows local users to panic the kernel during allocation on affected revisions. ocfs2_claim_suballoc_bits() calls ocfs2_find_victim_chain() without rejecting a cl_next_free_rec value of zero or greater than cl_count, and zero reaches a BUG_ON condition. Triggering requires an OCFS2 allocation chain list with no usable chains, and the resulting panic crashes the host.

CVSS severity0.0
None
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux Kernel OCFS2 allows local users to panic the kernel during allocation on affected revisions. ocfs2_claim_suballoc_bits() calls ocfs2_find_victim_chain() without rejecting a cl_next_free_rec value of zero or greater than cl_count, and zero reaches a BUG_ON condition. Triggering requires an OCFS2 allocation chain list with no usable chains, and the resulting panic crashes the host.

The record

CVE
CVE-2025-68771
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

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 <039bef30e320827bac8990c9f29d2a68cd8adb5f
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7acc0390e0dd7474c4451d05465a677d55ad4268
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <96f1b074c98c20f55a3b23d2ab44d9fb0f619869
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b08a33d5f80efe6979a6e8f905c1a898910c21dd
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e24aedae71652d4119049f1fbef6532ccbe3966d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <039bef30e320827bac8990c9f29d2a68cd8adb5f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7acc0390e0dd7474c4451d05465a677d55ad4268; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <96f1b074c98c20f55a3b23d2ab44d9fb0f619869; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b08a33d5f80efe6979a6e8f905c1a898910c21dd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e24aedae71652d4119049f1fbef6532ccbe3966d

Published CVSS scores

0.0Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:N

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)
Vectorlocal
Privilegesauthenticated
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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