CVE-2026-31668Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: seg6: separate dst_cache for input and output paths in seg6 lwtunnel The seg6 lwtunnel uses a single dst_cache per encap route, shared between seg6_input_core() and se…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.4%
9.8 → 3.3
critical → low
Last analysed / modified upstream
3.3 → 9.8
low → critical
In the Linux kernel, the following vulnerability has been resolved:
seg6: separate dst_cache for input and output paths in seg6 lwtunnel
The seg6 lwtunnel uses a single dst_cache per encap route, shared between seg6_input_core() and seg6_output_core(). These two paths can perform the post-encap SID lookup in different routing contexts (e.g., ip rules matching on the ingress interface, or VRF table separation). Whichever path runs first populates the cache, and the other reuses it blindly, bypassing its own lookup.
Fix this by splitting the cache into cache_input and cache_output, so each path maintains its own cached dst independently.
Linux >= 6c8702c60b88651072460f3f4026c7dfe2521d12 < 1dec91d3b1cefb82635761b7812154af3ef46449Linux >= 6c8702c60b88651072460f3f4026c7dfe2521d12 < 750569d6987a0ff46317a4b86eb3907e296287bfLinux >= 6c8702c60b88651072460f3f4026c7dfe2521d12 < 57d0374d14fa667dec6952173b93e7e84486d5c9Linux >= 6c8702c60b88651072460f3f4026c7dfe2521d12 < 84d458018b147176b259347103fccb7e93abd2b1Linux >= 6c8702c60b88651072460f3f4026c7dfe2521d12 < 6305ad032b03d2ea4181b953a66e19a9a6ed053cLinux >= 6c8702c60b88651072460f3f4026c7dfe2521d12 < fb56de5d99218de49d5d43ef3a99e062ecd0f9a1Linux >= 6c8702c60b88651072460f3f4026c7dfe2521d12 < 17d87d42874f5d6c1a0ccc6d9190dfe82a9a7a6aLinux >= 6c8702c60b88651072460f3f4026c7dfe2521d12 < c3812651b522fe8437ebb7063b75ddb95b571643Linux 4.10Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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