CVE-2026-43489

Service interruption via unrecorded failed retrievals

Published May 13, 2026 · Updated May 13, 2026

State-tracking flaw in Linux Kernel 6.19 allows local users to interrupt service through repeated failed liveupdate retrievals. luo_retrieve_file() returns an error without recording the attempted retrieval, so a retry or finish() reuses or frees partially restored serialization structures. Reaching the flaw requires local access to issue the LIVEUPDATE_SESSION_RETRIEVE_FD ioctl after a partial failure; the reported impact is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

State-tracking flaw in Linux Kernel 6.19 allows local users to interrupt service through repeated failed liveupdate retrievals. luo_retrieve_file() returns an error without recording the attempted retrieval, so a retry or finish() reuses or frees partially restored serialization structures. Reaching the flaw requires local access to issue the LIVEUPDATE_SESSION_RETRIEVE_FD ioctl after a partial failure; the reported impact is limited to availability.

The record

CVE
CVE-2026-43489
Published
May 13, 2026
Updated
May 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 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=7c722a7f44e0c1f9714084152226bc7bd644b7e3 <1d3ad69484dc1cc53be62d2554e7ef038a627af9
  3. Affected versionversion=7c722a7f44e0c1f9714084152226bc7bd644b7e3 <f85b1c6af5bc3872f994df0a5688c1162de07a62

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=7c722a7f44e0c1f9714084152226bc7bd644b7e3 <1d3ad69484dc1cc53be62d2554e7ef038a627af9; version=7c722a7f44e0c1f9714084152226bc7bd644b7e3 <f85b1c6af5bc3872f994df0a5688c1162de07a62

Published CVSS scores

5.5NIST NVDCVSS: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

T1499.004Application or System Exploitation

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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