Answer in brief
CVE-2026-52909 records a High severity (CVSS 7.8) vulnerability in ip6_vti: set netns_immutable on the fallback device.. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-52909 records a High severity (CVSS 7.8) vulnerability in ip6_vti: set netns_immutable on the fallback device.. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=61220ab349485d911083d0b7990ccd3db6c63297 <12acc977838c943636fb01e2f3087d2e4cc3b7cc || >=61220ab349485d911083d0b7990ccd3db6c63297 <7f28e3948c59481f8db9c9638e204258d26b4e41 || >=61220ab349485d911083d0b7990ccd3db6c63297 <12c65e2c7fef507551bd7b52123598a761662c01 || >=61220ab349485d911083d0b7990ccd3db6c63297 <f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3 || >=61220ab349485d911083d0b7990ccd3db6c63297 <c5dbd669db5a426b3025512322e1bf2cdbe14305 || >=61220ab349485d911083d0b7990ccd3db6c63297 <ecf8904067dcba0dad86ece80874841e60317885 || >=61220ab349485d911083d0b7990ccd3db6c63297 <dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 || >=61220ab349485d911083d0b7990ccd3db6c63297 <d289d5307762d1838aaece22c6b6fcad9e8865f9 | 12acc977838c943636fb01e2f3087d2e4cc3b7cc, 7f28e3948c59481f8db9c9638e204258d26b4e41, 12c65e2c7fef507551bd7b52123598a761662c01, f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3, c5dbd669db5a426b3025512322e1bf2cdbe14305, ecf8904067dcba0dad86ece80874841e60317885, dcdce3bc9f08026ff3739ee7339e1bef526fc5f3, d289d5307762d1838aaece22c6b6fcad9e8865f9 |
| Linux/Linuxgeneric | 3.15 | Not reported |
Published upstream
Jun 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=61220ab349485d911083d0b7990ccd3db6c63297 <12acc977838c943636fb01e2f3087d2e4cc3b7cc || >=61220ab349485d911083d0b7990ccd3db6c63297 <7f28e3948c59481f8db9c9638e204258d26b4e41 || >=61220ab349485d911083d0b7990ccd3db6c63297 <12c65e2c7fef507551bd7b52123598a761662c01 || >=61220ab349485d911083d0b7990ccd3db6c63297 <f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3 || >=61220ab349485d911083d0b7990ccd3db6c63297 <c5dbd669db5a426b3025512322e1bf2cdbe14305 || >=61220ab349485d911083d0b7990ccd3db6c63297 <ecf8904067dcba0dad86ece80874841e60317885 || >=61220ab349485d911083d0b7990ccd3db6c63297 <dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 || >=61220ab349485d911083d0b7990ccd3db6c63297 <d289d5307762d1838aaece22c6b6fcad9e8865f9 | 12acc977838c943636fb01e2f3087d2e4cc3b7cc, 7f28e3948c59481f8db9c9638e204258d26b4e41, 12c65e2c7fef507551bd7b52123598a761662c01, f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3, c5dbd669db5a426b3025512322e1bf2cdbe14305, ecf8904067dcba0dad86ece80874841e60317885, dcdce3bc9f08026ff3739ee7339e1bef526fc5f3, d289d5307762d1838aaece22c6b6fcad9e8865f9 |
| Linux/Linuxgeneric | 3.15 | Not reported |
Published upstream
Jun 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
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.
Quoted source text, attributed separately from HOL analysis.