CVE-2026-43041

Local denial of service via QRTR memory leak

Published May 1, 2026 · Updated May 1, 2026

A memory leak in QRTR flow tracking in affected Linux Kernel releases allows local users to exhaust kernel memory through repeated allocations. If a later radix-tree node allocation fails, __radix_tree_create() leaves earlier internal nodes linked without leaf entries, so iteration never reclaims them. Triggering requires local low-privileged access; successful exhaustion degrades availability and can interrupt the host.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A memory leak in QRTR flow tracking in affected Linux Kernel releases allows local users to exhaust kernel memory through repeated allocations. If a later radix-tree node allocation fails, __radix_tree_create() leaves earlier internal nodes linked without leaf entries, so iteration never reclaims them. Triggering requires local low-privileged access; successful exhaustion degrades availability and can interrupt the host.

The record

CVE
CVE-2026-43041
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=5.6
  2. Affected versionversion=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <0fda873092b541bb5a9b87d728a2429f863f8cfa
  3. Affected versionversion=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <2428083101f6883f979cceffa76cd8440751ffe6
  4. Affected versionversion=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <4b75ff0aedd6ade1018ad4a3a9d8336794e36e42
  5. Affected versionversion=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <5d2249eefaca59908fe3c264b8eca526424dcfbe
  6. Affected versionversion=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <69402908e277dd164bf8d7c8fd0513c0fac28e9e
  7. Affected versionversion=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <f2664bc4f0f356f17c2094587a2b3665e3867e44
  8. Affected versionversion=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <f2dd9aaf6e2861337f5835f877a5b2becaf4b015
  9. Affected versionversion=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <ff134cc43972d7ddceff8cfd36cf6b9eaafc00b3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.6; version=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <0fda873092b541bb5a9b87d728a2429f863f8cfa; version=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <2428083101f6883f979cceffa76cd8440751ffe6; version=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <4b75ff0aedd6ade1018ad4a3a9d8336794e36e42; version=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <5d2249eefaca59908fe3c264b8eca526424dcfbe; version=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <69402908e277dd164bf8d7c8fd0513c0fac28e9e; version=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <f2664bc4f0f356f17c2094587a2b3665e3867e44; version=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <f2dd9aaf6e2861337f5835f877a5b2becaf4b015; version=5fdeb0d372ab33b4175043a2a4a1730239a217f1 <ff134cc43972d7ddceff8cfd36cf6b9eaafc00b3

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-401Missing Release of Memory after Effective Lifetime
T1499.001OS Exhaustion Flood

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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