CVE-2026-43472

Process isolation via shared fs_struct namespace copy

Published May 8, 2026 · Updated May 8, 2026

Resource-state corruption in the Linux Kernel allows local users to leave a process rooted on detached mounts through unshare(2). When CLONE_NEWNS is requested for an unshared fs_struct, unshare_fs() passes current->fs to copy_mnt_ns() instead of allocating a private copy. If later CLONE_NEWCGROUP processing fails, cleanup dissolves the new mount tree while pwd and root still pin its detached mounts, isolating the calling process.

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

Resource-state corruption in the Linux Kernel allows local users to leave a process rooted on detached mounts through unshare(2). When CLONE_NEWNS is requested for an unshared fs_struct, unshare_fs() passes current->fs to copy_mnt_ns() instead of allocating a private copy. If later CLONE_NEWCGROUP processing fails, cleanup dissolves the new mount tree while pwd and root still pin its detached mounts, isolating the calling process.

The record

CVE
CVE-2026-43472
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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 <42e21e74061b0ebbd859839f81acf10efad02a27
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6c4b2243cb6c0755159bd567130d5e12e7b10d9f
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <845bf3c6963a52096d0d3866e4a92db77a0c03d8
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aa9ebc084505fb26dd90f4d7a249045aad152043
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <af8f4be3b68ac8caa41c8e5ead0eeaf5e85e42d0
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0d99f60538ddb4a62ccaac2168d8f448965f083
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3ffc8f13034af895531a02c30b1fe3a34b46432
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d7963d6997fea86a6def242ac36198b86655f912

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <42e21e74061b0ebbd859839f81acf10efad02a27; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6c4b2243cb6c0755159bd567130d5e12e7b10d9f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <845bf3c6963a52096d0d3866e4a92db77a0c03d8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aa9ebc084505fb26dd90f4d7a249045aad152043; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <af8f4be3b68ac8caa41c8e5ead0eeaf5e85e42d0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0d99f60538ddb4a62ccaac2168d8f448965f083; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3ffc8f13034af895531a02c30b1fe3a34b46432; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d7963d6997fea86a6def242ac36198b86655f912

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 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

CWE-908Use of Uninitialized Resource

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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