CVE-2026-53221ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 before c327fa4fca31415431202e063767a7ae342e19c6; from fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 before fc657ac0767c49839b3ef0b08dc0953ca30883f8; from fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 before 47fb3c2b4203556308e64354b3e78f2ce221d646; from fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 before f513f308cc4bdb4530d033431592ffbc29b7fca1; from fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 before 90fd4513315ca07da99cfd8549d3e553a7160f0d; from fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 before 2abfb19bbb81958714ad1d43ebeb65b30394184b; from fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 before 2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d; from fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 before a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9 | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 3.19 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; and 6 more ranges | NVD |
References
- https://git.kernel.org/stable/c/c327fa4fca31415431202e063767a7ae342e19c6patch
- https://git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8patch
- https://git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646patch
- https://git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1patch
- https://git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0dpatch
- https://git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184bpatch
- https://git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2dpatch
- https://git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.