CVE-2026-43339

Kernel memory compromise via post-deletion IPv6 logging

Published May 8, 2026 · Updated May 8, 2026

Use-after-free in the IPv6 address configuration code in Linux Kernel allows local users to trigger unsafe access to freed kernel memory. In addrconf_permanent_addr(), the failure path calls ipv6_del_addr(ifp) before net_info_ratelimited() dereferences ifp->addr, so deletion can precede the log access. Low-privileged local access is required; successful exploitation can compromise kernel memory confidentiality, integrity, and availability.

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 the IPv6 address configuration code in Linux Kernel allows local users to trigger unsafe access to freed kernel memory. In addrconf_permanent_addr(), the failure path calls ipv6_del_addr(ifp) before net_info_ratelimited() dereferences ifp->addr, so deletion can precede the log access. Low-privileged local access is required; successful exploitation can compromise kernel memory confidentiality, integrity, and availability.

The record

CVE
CVE-2026-43339
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
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=4.6
  2. Affected versionversion=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <25357b670afb5b517096da783abaa5cc4bf8359e
  3. Affected versionversion=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <2d88ed7fa000e19c2dc0fa31b3a849e3f5bca5c1
  4. Affected versionversion=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <3cd4efb5df72843dfac892d0b3c7a4a8bd926b65
  5. Affected versionversion=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <7bfafa1b0cd582983ebec6bb20f0a435528fe567
  6. Affected versionversion=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <7d9f2f4aabd116ca68fbdab5d8fb8dac74c2ea1e
  7. Affected versionversion=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <bacc7f31085c9820922f00bc7d79756ffa13123a
  8. Affected versionversion=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <eec49a33611f20336b357b3953df44f1a02049e8
  9. Affected versionversion=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <fd63f185979b047fb22a0dfc6bd94d0cab6a6a70

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.6; version=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <25357b670afb5b517096da783abaa5cc4bf8359e; version=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <2d88ed7fa000e19c2dc0fa31b3a849e3f5bca5c1; version=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <3cd4efb5df72843dfac892d0b3c7a4a8bd926b65; version=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <7bfafa1b0cd582983ebec6bb20f0a435528fe567; version=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <7d9f2f4aabd116ca68fbdab5d8fb8dac74c2ea1e; version=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <bacc7f31085c9820922f00bc7d79756ffa13123a; version=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <eec49a33611f20336b357b3953df44f1a02049e8; version=f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac <fd63f185979b047fb22a0dfc6bd94d0cab6a6a70

Published CVSS scores

7.8kernel.orgCVSS: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
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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