CVE-2026-53221ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
- 9.8CriticalCVSS base score
- 0.58%Exploitation in 30 daysEPSS · top 52% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 16 days later
· 16 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.58% · top 52% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 – < c327fa4fca31415431202e063767a7ae342e19c6
- affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 – < fc657ac0767c49839b3ef0b08dc0953ca30883f8
- affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 – < 47fb3c2b4203556308e64354b3e78f2ce221d646
- affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 – < f513f308cc4bdb4530d033431592ffbc29b7fca1
- affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 – < 90fd4513315ca07da99cfd8549d3e553a7160f0d
- affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 – < 2abfb19bbb81958714ad1d43ebeb65b30394184b
- affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 – < 2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d
- affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 – < a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9
- affected 3.19
- unaffected < 3.19
- unaffected 5.10.259 – ≤ 5.10.*
- unaffected 5.15.210 – ≤ 5.15.*
- unaffected 6.1.176 – ≤ 6.1.*
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.94 – ≤ 6.12.*
- unaffected 6.18.36 – ≤ 6.18.*
- unaffected 7.0.13 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References9
- https://git.kernel.org/stable/c/c327fa4fca31415431202e063767a7ae342e19c6 (opens in a new tab)
- https://git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8 (opens in a new tab)
- https://git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646 (opens in a new tab)
- https://git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1 (opens in a new tab)
- https://git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0d (opens in a new tab)
- https://git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184b (opens in a new tab)
- https://git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d (opens in a new tab)
- https://git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-39312 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-53221)Record last updated .