CVE-2026-43178

Kernel memory corruption via double mmput

Published May 6, 2026 · Updated May 6, 2026

Double free in Linux Kernel 6.12.70 through 6.12.74, 6.18.10 through 6.18.15, and 6.19 through 6.19.5 allows local users to corrupt memory. The ENAMETOOLONG path in do_procmap_query() reaches generic cleanup after mmput() has released mm_struct, so cleanup releases it again. The condition requires low-privilege local access and a malformed PROCMAP_QUERY build-ID buffer; published records identify no demonstrated post-corruption outcome.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in Linux Kernel 6.12.70 through 6.12.74, 6.18.10 through 6.18.15, and 6.19 through 6.19.5 allows local users to corrupt memory. The ENAMETOOLONG path in do_procmap_query() reaches generic cleanup after mmput() has released mm_struct, so cleanup releases it again. The condition requires low-privilege local access and a malformed PROCMAP_QUERY build-ID buffer; published records identify no demonstrated post-corruption outcome.

The record

CVE
CVE-2026-43178
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-1341, CWE-415
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=6.19
  2. Affected versionversion=b5cbacd7f86f4f62b8813688c8e73be94e8e1951 <61dc9f776705d6db6847c101b98fa4f0e9eb6fa3
  3. Affected versionversion=b5cbacd7f86f4f62b8813688c8e73be94e8e1951 <90f5e87c9b75833b9ef3a4415b92c0247f28ab2f
  4. Affected versionversion=b9b97e6aeb534315f9646b2090d1a5024c6a4e82 <f9fe092084cd04deea18747f58a2304026e76aaa
  5. Affected versionversion=cbc03ce3e6ce7e21214c3f02218213574c1a2d08 <8adaff87db143583e08eec4f4e7788f1ef8af94d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=b5cbacd7f86f4f62b8813688c8e73be94e8e1951 <61dc9f776705d6db6847c101b98fa4f0e9eb6fa3; version=b5cbacd7f86f4f62b8813688c8e73be94e8e1951 <90f5e87c9b75833b9ef3a4415b92c0247f28ab2f; version=b9b97e6aeb534315f9646b2090d1a5024c6a4e82 <f9fe092084cd04deea18747f58a2304026e76aaa; version=cbc03ce3e6ce7e21214c3f02218213574c1a2d08 <8adaff87db143583e08eec4f4e7788f1ef8af94d

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/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-1341Multiple Releases of Same Resource or Handle
CWE-415Double Free

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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