5.5

CVE-2026-31692: rtnetlink: add missing netlink_ns_capable() check for peer netns

Analyzed
AliasesUBUNTU-CVE-2026-31692DEBIAN-CVE-2026-31692CGA-2g98-34rv-fp57
Published 30-04-2026Last modified 11-05-2026

Vulnerability summary

CVE-2026-31692 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.12%
0%100%
Low · -0.04 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 5 · Related 1
RHSA-2026:45114RHSA-2026:49213RHSA-2026:49214RHSA-2026:67150RHSA-2026:69837CGA-4M28-W32W-PX9F

Timeline

  1. 30-04-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: rtnetlink: add missing netlink_ns_capable() check for peer netns rtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer network namespace when creating paired devices (veth, vxcan, netkit). This allows an unprivileged user with a user namespace to create interfaces in arbitrary network namespaces, including init_net. Add a netlink_ns_capable() check for CAP_NET_ADMIN in the peer namespace before allowing device creation to proceed.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.12%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

Decrease -0.04 pp

From 0.16% 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

No weakness data has been published for this record.

Affected systems

Version check

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

Ubuntu159 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard10 products
  • linux-aws-6.12< 6.12.85-r2
  • linux-aws-6.18< 6.18.31-r0
  • linux-azure-6.12< 6.12.85-r2
  • linux-azure-6.18< 6.18.31-r0 | < 6.18.24-r1
  • linux-gcp-6.12All versions (No fix recorded)
Linux2 products
  • linux≥ 81adee47dfb608df3ad0b91d230fb3cef75f0060, < 0975b64ffb34560042090a5986c3a02e6c80f36f | ≥ 81adee47dfb608df3ad0b91d230fb3cef75f0060, < d04cc16d3624218a5458b2b664ae431f1b3b334d | ≥ 81adee47dfb608df3ad0b91d230fb3cef75f0060, < 7b735ef81286007794a227ce2539419479c02a5f | 2.6.33
  • linux_kernel≥ 2.6.33, < 6.18.24 | ≥ 6.19, < 6.19.14 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.19.14-1

4 vendors · 172 products

References

7 links