CVE-2026-43106

Kernel memory corruption via lost dentry reference

Published May 6, 2026 · Updated May 6, 2026

Use-after-free in Linux Kernel 6.19 through 6.19.13 allows local users to corrupt kernel memory through CacheFiles culling. cachefiles_cull() passes the rep dentry to cachefiles_bury_object() with one reference instead of the two references that the callee consumes. The flaw requires an active CacheFiles cache and culling; the resulting use-after-free can crash the kernel or let reused dentry memory influence control flow.

CVSS severity7.8
High
EPSS probability0.11%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel 6.19 through 6.19.13 allows local users to corrupt kernel memory through CacheFiles culling. cachefiles_cull() passes the rep dentry to cachefiles_bury_object() with one reference instead of the two references that the callee consumes. The flaw requires an active CacheFiles cache and culling; the resulting use-after-free can crash the kernel or let reused dentry memory influence control flow.

The record

CVE
CVE-2026-43106
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
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=7bb1eb45e43c4730cbc5a48b9e9295049fccdacb <1635c2acdde86c4f555b627aec873c8677c421ed
  3. Affected versionversion=7bb1eb45e43c4730cbc5a48b9e9295049fccdacb <6577df7dc7a7de128442b6192c7a32195c923480

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=7bb1eb45e43c4730cbc5a48b9e9295049fccdacb <1635c2acdde86c4f555b627aec873c8677c421ed; version=7bb1eb45e43c4730cbc5a48b9e9295049fccdacb <6577df7dc7a7de128442b6192c7a32195c923480

Published CVSS scores

7.8LinuxCVSS: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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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