7.8

CVE-2026-43339: ipv6: prevent possible UaF in addrconf_permanent_addr()

Modified
AliasesUBUNTU-CVE-2026-43339DEBIAN-CVE-2026-43339
Published 08-05-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-43339 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.16%
0%100%
Low · -0.02 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 43 · Related 39
OPENSUSE-SU-2026:21388-1RHSA-2026:64775RHSA-2026:66180RHSA-2026:68531RHSA-2026:68532SUSE-SU-2026:22433-1

Timeline

  1. 08-05-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: prevent possible UaF in addrconf_permanent_addr() The mentioned helper try to warn the user about an exceptional condition, but the message is delivered too late, accessing the ipv6 after its possible deletion. Reorder the statement to avoid the possible UaF; while at it, place the warning outside the idev->lock as it needs no protection.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

Decrease -0.02 pp

From 0.18% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu156 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac, < eec49a33611f20336b357b3953df44f1a02049e8 | ≥ f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac, < bacc7f31085c9820922f00bc7d79756ffa13123a | ≥ f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac, < 7bfafa1b0cd582983ebec6bb20f0a435528fe567 | ≥ f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac, < 7d9f2f4aabd116ca68fbdab5d8fb8dac74c2ea1e | ≥ f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac, < 25357b670afb5b517096da783abaa5cc4bf8359e | ≥ f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac, < 3cd4efb5df72843dfac892d0b3c7a4a8bd926b65 | ≥ f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac, < 2d88ed7fa000e19c2dc0fa31b3a849e3f5bca5c1 | ≥ f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac, < fd63f185979b047fb22a0dfc6bd94d0cab6a6a70 | 4.6
  • linux_kernel≥ 4.6, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.134 | ≥ 6.7, < 6.12.81 | ≥ 6.13, < 6.18.22 | ≥ 6.19, < 6.19.12 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.12-1

3 vendors · 159 products

References

39 links
Show all 39 references