7.8

CVE-2026-52909: ip6_vti: set netns_immutable on the fallback device.

Modified
AliasesUBUNTU-CVE-2026-52909DEBIAN-CVE-2026-52909CGA-34vp-6992-wcrf
Published 19-06-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-52909 is a high (CVSS 7.8) Incorrect Authorization vulnerability in linux. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1.4% 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
0.11%
0%100%
Low · -0.01 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 186 · Related 186
MGASA-2026-0312OPENSUSE-SU-2026:21388-1SUSE-SU-2026:22521-1SUSE-SU-2026:22522-1SUSE-SU-2026:22598-1SUSE-SU-2026:22665-1

Showing 100 of 187.

Timeline

  1. 19-06-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ip6_vti: set netns_immutable on the fallback device. john1988 and Noam Rathaus reported that vti6_init_net() does not set the netns_immutable flag on the per-netns fallback tunnel device (ip6_vti0). Other similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel) correctly set this flag during their fallback device initialization to prevent them from being moved to another network namespace.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.11%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

Decrease -0.01 pp

From 0.12% 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.

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard11 products
  • linux-aws-6.12< 6.12.96-r0
  • linux-azure-6.12< 6.12.96-r0
  • linux-azure-6.18< 6.18.38-r0
  • linux-gcp-6.12< 6.12.96-r0
  • linux-gcp-6.18< 6.18.38-r0
Linux2 products
  • linux≥ 61220ab349485d911083d0b7990ccd3db6c63297, < 12acc977838c943636fb01e2f3087d2e4cc3b7cc | ≥ 61220ab349485d911083d0b7990ccd3db6c63297, < 7f28e3948c59481f8db9c9638e204258d26b4e41 | ≥ 61220ab349485d911083d0b7990ccd3db6c63297, < 12c65e2c7fef507551bd7b52123598a761662c01 | ≥ 61220ab349485d911083d0b7990ccd3db6c63297, < f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3 | ≥ 61220ab349485d911083d0b7990ccd3db6c63297, < c5dbd669db5a426b3025512322e1bf2cdbe14305 | ≥ 61220ab349485d911083d0b7990ccd3db6c63297, < ecf8904067dcba0dad86ece80874841e60317885 | ≥ 61220ab349485d911083d0b7990ccd3db6c63297, < dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 | ≥ 61220ab349485d911083d0b7990ccd3db6c63297, < d289d5307762d1838aaece22c6b6fcad9e8865f9 | 3.15
  • linux_kernel≥ 3.15, < 5.10.260 | ≥ 5.11, < 5.15.211 | ≥ 5.16, < 6.1.177 | ≥ 6.2, < 6.6.144 | ≥ 6.7, < 6.12.95 | ≥ 6.13, < 6.18.36 | ≥ 6.19, < 7.0.13 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4 | 7.1:rc5 | 7.1:rc6 | 7.1:rc7
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.13-1

4 vendors · 183 products

References

36 links
Show all 36 references