ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53221
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:39 UTC
Updated2026-07-02 20:49:09 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.005590000 probability, percentile 0.424470000 (date 2026-07-04)

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 c327fa4fca31415431202e063767a7ae342e19c6 git Not specified
CNA Linux Linux affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 fc657ac0767c49839b3ef0b08dc0953ca30883f8 git Not specified
CNA Linux Linux affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 47fb3c2b4203556308e64354b3e78f2ce221d646 git Not specified
CNA Linux Linux affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 f513f308cc4bdb4530d033431592ffbc29b7fca1 git Not specified
CNA Linux Linux affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 90fd4513315ca07da99cfd8549d3e553a7160f0d git Not specified
CNA Linux Linux affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 2abfb19bbb81958714ad1d43ebeb65b30394184b git Not specified
CNA Linux Linux affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d git Not specified
CNA Linux Linux affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9 git Not specified
CNA Linux Linux affected 3.19 Not specified
CNA Linux Linux unaffected 3.19 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c327fa4fca31415431202e063767a7ae342e19c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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