{"cve":"CVE-2025-68208","nvd":{"published":"2025-12-16T14:15:53.700","modified":"2026-10-15T22:19:10.613","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: account for current allocated stack depth in widen_imprecise_scalars()\n\nThe usage pattern for widen_imprecise_scalars() looks as follows:\n\n    prev_st = find_prev_entry(env, ...);\n    queued_st = push_stack(...);\n    widen_imprecise_scalars(env, prev_st, queued_st);\n\nWhere prev_st is an ancestor of the queued_st in the explored states\ntree. This ancestor is not guaranteed to have same allocated stack\ndepth as queued_st. E.g. in the following case:\n\n    def main():\n      for i in 1..2:\n        foo(i)        // same callsite, differnt param\n\n    def foo(i):\n      if i == 1:\n        use 128 bytes of stack\n      iterator based loop\n\nHere, for a second 'foo' call prev_st->allocated_stack is 128,\nwhile queued_st->allocated_stack is much smaller.\nwiden_imprecise_scalars() needs to take this into account and avoid\naccessing bpf_verifier_state->frame[*]->stack out of bounds.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://git.kernel.org/stable/c/57e04e2ff56e32f923154f0f7bc476fcb596ffe7","https://git.kernel.org/stable/c/64b12dca2b0abcb5fc0542887d18b926ea5cf711","https://git.kernel.org/stable/c/9944c7938cd5b3f37b0afec0481c7c015e4f1c58","https://git.kernel.org/stable/c/b0c8e6d3d866b6a7f73877f71968dbffd27b7785"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:17:07.138532058+00:00"},"epss":{"cve":"CVE-2025-68208","score":0.00154,"percentile":0.04475,"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."]}