CVE-2026-53221
ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
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.
INFO
Published Date :
June 25, 2026, 8:39 a.m.
Last Modified :
June 25, 2026, 8:39 a.m.
Remotely Exploit :
No
Source :
Linux
Affected Products
The following products are affected by CVE-2026-53221
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel.
- Verify tunnel lookup logic.
- Apply relevant security patches.
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