{"cve":"CVE-2026-31668","nvd":{"published":"2026-04-24T15:16:46.533","modified":"2026-10-19T19:18:04.760","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: separate dst_cache for input and output paths in seg6 lwtunnel\n\nThe seg6 lwtunnel uses a single dst_cache per encap route, shared\nbetween seg6_input_core() and seg6_output_core(). These two paths\ncan perform the post-encap SID lookup in different routing contexts\n(e.g., ip rules matching on the ingress interface, or VRF table\nseparation). Whichever path runs first populates the cache, and the\nother reuses it blindly, bypassing its own lookup.\n\nFix this by splitting the cache into cache_input and cache_output,\nso each path maintains its own cached dst independently.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-459"],"references":["https://git.kernel.org/stable/c/17d87d42874f5d6c1a0ccc6d9190dfe82a9a7a6a","https://git.kernel.org/stable/c/1dec91d3b1cefb82635761b7812154af3ef46449","https://git.kernel.org/stable/c/57d0374d14fa667dec6952173b93e7e84486d5c9","https://git.kernel.org/stable/c/6305ad032b03d2ea4181b953a66e19a9a6ed053c","https://git.kernel.org/stable/c/750569d6987a0ff46317a4b86eb3907e296287bf"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2026-31668","score":0.00443,"percentile":0.38199,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}