CVE-2026-43262

System hang via recursive GFS2 glock acquisition

Published May 6, 2026 · Updated May 6, 2026

Denial of service in Linux Kernel GFS2 allows local users to hang the system by passing a same-inode memory-mapped buffer to FIEMAP. gfs2_fiemap calls iomap_fiemap while holding the inode glock, so a page fault on that buffer recursively acquires the same glock. Reachability requires local access to a GFS2 inode and a FIEMAP output buffer mapped to that same inode; the resulting deadlock interrupts system availability.

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

Denial of service in Linux Kernel GFS2 allows local users to hang the system by passing a same-inode memory-mapped buffer to FIEMAP. gfs2_fiemap calls iomap_fiemap while holding the inode glock, so a page fault on that buffer recursively acquires the same glock. Reachability requires local access to a GFS2 inode and a FIEMAP output buffer mapped to that same inode; the resulting deadlock interrupts system availability.

The record

CVE
CVE-2026-43262
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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 <2e121c53b581e40397ae08090a7af4ed10781fbc
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d2c4f182ea8516de8682e2b60411c03df00e3ea
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d5d9ec957bfa1eb2b05861c19f5d701dd006db7
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9d15fee888f0e8938c9aeed71ec9c2cbba0c88ab
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cead3bebf3e318578b8a86a5472015d713d2a8a8
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e411d74cc5ba290f85d0dd5e4d1df8f1d6d975d2
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e428670cfb2993d8c224effd076242ca6b0950de

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2e121c53b581e40397ae08090a7af4ed10781fbc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d2c4f182ea8516de8682e2b60411c03df00e3ea; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d5d9ec957bfa1eb2b05861c19f5d701dd006db7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9d15fee888f0e8938c9aeed71ec9c2cbba0c88ab; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cead3bebf3e318578b8a86a5472015d713d2a8a8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e411d74cc5ba290f85d0dd5e4d1df8f1d6d975d2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e428670cfb2993d8c224effd076242ca6b0950de

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-401Missing Release of Memory after Effective Lifetime
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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