CVE-2026-43187Network attack vector

Data loss via stale attribute-leaf freemap entries

Published May 6, 2026 · Updated May 6, 2026

XFS attribute-leaf corruption in the Linux kernel allows local users to cause data loss through repeated extended-attribute updates. In _leaf_add, array growth can leave a zero-length freemap entry with a nonzero base and fail to adjust another entry, so later name-value allocation overlaps the entries array. Reachability requires write access to a file on a vulnerable XFS mount; that access can be local or mediated by an exported filesystem.

CVSS severity8.8
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XFS attribute-leaf corruption in the Linux kernel allows local users to cause data loss through repeated extended-attribute updates. In _leaf_add, array growth can leave a zero-length freemap entry with a nonzero base and fail to adjust another entry, so later name-value allocation overlaps the entries array. Reachability requires write access to a file on a vulnerable XFS mount; that access can be local or mediated by an exported filesystem.

The record

CVE
CVE-2026-43187
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1485
Attack vector
network
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 <479b05fc3ee272090f671b06a41f3da8aa78eece
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6f13c1d2a6271c2e73226864a0e83de2770b6f34
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a631899025d47ea1aa6464d76db5b4d3b6d196fd
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aa9083d97e2157da3c6fb45ddb1a97af7f188f7f
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e1b8c6452ee99a30e188a88f3f3f804fb1c6004a
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f31a8334e1c54b126fcecf98645a49b6bc5ad399
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f3c0d1fc1eadbb4adbee5ab7757d41d35f48325b
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ffaf5c99d0f862db021fb1af8b813c1416b1beb2
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <479b05fc3ee272090f671b06a41f3da8aa78eece; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6f13c1d2a6271c2e73226864a0e83de2770b6f34; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a631899025d47ea1aa6464d76db5b4d3b6d196fd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aa9083d97e2157da3c6fb45ddb1a97af7f188f7f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e1b8c6452ee99a30e188a88f3f3f804fb1c6004a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f31a8334e1c54b126fcecf98645a49b6bc5ad399; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f3c0d1fc1eadbb4adbee5ab7757d41d35f48325b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ffaf5c99d0f862db021fb1af8b813c1416b1beb2; version=2.6.12

Published CVSS scores

8.8Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.8UbuntuCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA: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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1485Data Destruction

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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