CVE-2026-64187

Local crash via crafted XFS recovery log

Published Jul 20, 2026 · Updated Jul 20, 2026

NULL pointer dereference in XFS log recovery allows local users to crash the Linux kernel by mounting a filesystem with a crafted log. xlog_recover_add_to_trans() can queue a committed item with ri_cnt set to zero and ri_buf left NULL, after which xlog_recover_reorder_trans() calls ITEM_TYPE() and dereferences ri_buf[0]. The runtime commit path does not create this state, so exploitation requires a crafted on-disk XFS log and results in a kernel crash during mount recovery.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in XFS log recovery allows local users to crash the Linux kernel by mounting a filesystem with a crafted log. xlog_recover_add_to_trans() can queue a committed item with ri_cnt set to zero and ri_buf left NULL, after which xlog_recover_reorder_trans() calls ITEM_TYPE() and dereferences ri_buf[0]. The runtime commit path does not create this state, so exploitation requires a crafted on-disk XFS log and results in a kernel crash during mount recovery.

The record

CVE
CVE-2026-64187
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 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=4.3
  2. Affected versionversion=89cebc8477290b152618ffa110bbeae340d50900 <2094dab19d45c487285617b7b68913d0cc0c1211
  3. Affected versionversion=89cebc8477290b152618ffa110bbeae340d50900 <cccbabeb9a18fcb978d76d6047f2b59214aa7749
  4. Affected versionversion=89cebc8477290b152618ffa110bbeae340d50900 <d50b1fd066d66ceb548ba43e332cfe8a47e5e55a
  5. Affected versionversion=89cebc8477290b152618ffa110bbeae340d50900 <d98f22d2e11e0a36493aeb25b2933571ee90d9a4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.3; version=89cebc8477290b152618ffa110bbeae340d50900 <2094dab19d45c487285617b7b68913d0cc0c1211; version=89cebc8477290b152618ffa110bbeae340d50900 <cccbabeb9a18fcb978d76d6047f2b59214aa7749; version=89cebc8477290b152618ffa110bbeae340d50900 <d50b1fd066d66ceb548ba43e332cfe8a47e5e55a; version=89cebc8477290b152618ffa110bbeae340d50900 <d98f22d2e11e0a36493aeb25b2933571ee90d9a4

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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