CVE-2026-43153

Kernel memory corruption via stale XFS buffer

Published May 6, 2026 · Updated May 6, 2026

Use-after-free in the XFS extended-attribute path in affected Linux Kernel releases allows local users to corrupt kernel memory via xattr operations. xfs_attr_leaf_hasname returns a non-NULL pointer to an already released xfs_buf when xfs_attr3_leaf_lookup_int fails with errors other than -ENOATTR or -EEXIST. Triggering requires a mounted XFS filesystem and an extended-attribute operation that produces such a lookup error; releasing the stale pointer again can corrupt kernel memory or crash the system.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the XFS extended-attribute path in affected Linux Kernel releases allows local users to corrupt kernel memory via xattr operations. xfs_attr_leaf_hasname returns a non-NULL pointer to an already released xfs_buf when xfs_attr3_leaf_lookup_int fails with errors other than -ENOATTR or -EEXIST. Triggering requires a mounted XFS filesystem and an extended-attribute operation that produces such a lookup error; releasing the stale pointer again can corrupt kernel memory or crash the system.

The record

CVE
CVE-2026-43153
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
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=07120f1abdff80f3d1351f733661abe28d609535 <2fbc8421d1db102c0e5458607e042a23a03648b1
  2. Affected versionversion=07120f1abdff80f3d1351f733661abe28d609535 <3a65ea768b8094e4699e72f9ab420eb9e0f3f568
  3. Affected versionversion=07120f1abdff80f3d1351f733661abe28d609535 <457121c01f609b9934addbb04d5c1ef638c71c61
  4. Affected versionversion=07120f1abdff80f3d1351f733661abe28d609535 <530082df991903f3330354e99e0cb7b05debfa86
  5. Affected versionversion=5.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=07120f1abdff80f3d1351f733661abe28d609535 <2fbc8421d1db102c0e5458607e042a23a03648b1; version=07120f1abdff80f3d1351f733661abe28d609535 <3a65ea768b8094e4699e72f9ab420eb9e0f3f568; version=07120f1abdff80f3d1351f733661abe28d609535 <457121c01f609b9934addbb04d5c1ef638c71c61; version=07120f1abdff80f3d1351f733661abe28d609535 <530082df991903f3330354e99e0cb7b05debfa86; version=5.9

Published CVSS scores

5.5Oracle LinuxCVSS: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

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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