01 Record

CVE-2026-53221

ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()

CriticalPUBLISHEDCNA: Linux

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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02 Description

ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.57% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 47.2% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-19.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-06-25 08:39Z4 MO AGO

Last updated

2026-10-19 19:57Z9 DAYS AGO

Reserved

2026-06-09

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

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

Weaknesses

CWE-20Improper Input ValidationClass

Data version

5.2

Document digest

b1b43483b933317d2fe2ba252f9707edbcdfd61147823178b50c7b2339dcc954

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxfbe68ee87522f6eaa10f9076c0a7117e1613f2f7 to < c327fa4fca31415431202e063767a7ae342e19c6, fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 to < fc657ac0767c49839b3ef0b08dc0953ca30883f8, fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 to < 47fb3c2b4203556308e64354b3e78f2ce221d646, fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 to < f513f308cc4bdb4530d033431592ffbc29b7fca1, fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 to < 90fd4513315ca07da99cfd8549d3e553a7160f0d, fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 to < 2abfb19bbb81958714ad1d43ebeb65b30394184b, fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 to < 2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d, fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 to < a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9, 3.19—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/c327fa4fca31415431202e063767a7ae342e19c6
git.kernel.orghttps://git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8
git.kernel.orghttps://git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646
git.kernel.orghttps://git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1
git.kernel.orghttps://git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0d
git.kernel.orghttps://git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184b
git.kernel.orghttps://git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d
git.kernel.orghttps://git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-784472.html

07 Fixed in

Debian 12

linux
Fixed in 6.1.176-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.94-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 7.0.13-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.