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CVE-2026-53221

CRITICAL
9.8
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-53221
State
PUBLISHED
Assigner
Linux
Reserved
2026-06-09 07:44 UTC
Published
2026-06-25 08:39 UTC
Last updated
2026-06-28 06:40 UTC
Vendor / Product
Linux / Linux
Sources
cve.org  ·  NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products (2)
VendorProductPlatformVersions
Linux Linux — fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 < c327fa4fca31415431202e063767a7ae342e19c6, fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 < fc657ac0767c49839b3ef0b08dc0953ca30883f8, fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 < 47fb3c2b4203556308e64354b3e78f2ce221d646, fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 < f513f308cc4bdb4530d033431592ffbc29b7fca1 …
Linux Linux — 3.19, 0 < 3.19, 5.10.259 ≤ 5.10.*, 5.15.210 ≤ 5.15.* …
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.8 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References (8)
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