CVE-2026-53221
Analyzed
Analyzed - Analysis Complete
Linux Kernel IPv6 VTI Tunnel Matching Vulnerability
Vulnerability report for CVE-2026-53221, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-06-25
Last updated on: 2026-07-02
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
In vti6_tnl_lookup(), when an exact match for a tunnel fails,
the code falls back to searching for wildcard tunnels:
- Tunnels matching the packet's local address, with any remote address
wildcard remote).
- Tunnels matching the packet's remote address, with any local address
(wildcard local).
However, vti6 stores all these different types of tunnels in the same
hash table (ip6n->tnls_r_l) prone to hash collisions.
The bug is that the fallback search loops in vti6_tnl_lookup() were
missing checks to ensure that the candidate tunnel actually has
a wildcard address.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | From 5.16 (inc) to 6.1.176 (exc) |
| linux | linux_kernel | From 6.2 (inc) to 6.6.143 (exc) |
| linux | linux_kernel | From 5.11 (inc) to 5.15.210 (exc) |
| linux | linux_kernel | From 3.19 (inc) to 5.10.259 (exc) |
| linux | linux_kernel | From 6.13 (inc) to 6.18.36 (exc) |
| linux | linux_kernel | From 6.7 (inc) to 6.12.94 (exc) |
| linux | linux_kernel | From 6.19 (inc) to 7.0.13 (exc) |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
