CVE-2026-43388

DAMON walk interruption via stale control pointer

Published May 8, 2026 · Updated May 8, 2026

Use-after-free in Linux Kernel 6.14 through 6.18.18, 6.19 through 6.19.8, and 7.0-rc1 through 7.0-rc3 allows local users to disrupt DAMON walks. damos_walk() stores a caller-provided stack control object in ctx->walk_control, then returns -EINVAL for an inactive context without clearing the pointer. The stale non-NULL pointer makes later walks return -EBUSY only while the context remains off; starting it creates a fresh context, and the kernel team states that the use-after-free path is unreachable.

CVSS severity7.8
High
EPSS probability0.12%
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 Linux Kernel 6.14 through 6.18.18, 6.19 through 6.19.8, and 7.0-rc1 through 7.0-rc3 allows local users to disrupt DAMON walks. damos_walk() stores a caller-provided stack control object in ctx->walk_control, then returns -EINVAL for an inactive context without clearing the pointer. The stale non-NULL pointer makes later walks return -EBUSY only while the context remains off; starting it creates a fresh context, and the kernel team states that the use-after-free path is unreachable.

The record

CVE
CVE-2026-43388
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499
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=6.14
  2. Affected versionversion=bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61 <9320c77134ab8d7701e20608bbf08517df4fa321
  3. Affected versionversion=bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61 <ce0aa47c963b8c3e5beace89e2b5a665a64b5b6b
  4. Affected versionversion=bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61 <d210fdcac9c0d1380eab448aebc93f602c1cd4e6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.14; version=bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61 <9320c77134ab8d7701e20608bbf08517df4fa321; version=bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61 <ce0aa47c963b8c3e5beace89e2b5a665a64b5b6b; version=bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61 <d210fdcac9c0d1380eab448aebc93f602c1cd4e6

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-416Use After Free
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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