CVE-2025-68208
In the Linux kernel, the following vulnerability has been resolved: bpf: account for current allocated stack depth in widen_imprecise_scalars() The usage pattern for widen_imprecise_scalars() looks as follows: prev_st = find_prev_entry(env, ...); queued_st = push_stack(...); widen_imprecise_scalars(env, prev_st, queued_st); Where prev_st is an ancestor of the queued_st in the explored states tree. This ancestor is not guaranteed to have same allocated stack depth as queued_st. E.g. in the following case: def main(): for i in 1..2: foo(i) // same callsite, differnt param def foo(i): if i == 1: use 128 bytes of stack iterator based loop Here, for a second 'foo' call prev_st->allocated_stack is 128, while queued_st->allocated_stack is much smaller. widen_imprecise_scalars() needs to take this into account and avoid accessing bpf_verifier_state->frame[*]->stack out of bounds.
Affected versions
Linux kernel versions
6.6.15,
6.7
and later are affected. Fixed in
6.6.117,
6.12.59,
6.17.9,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-68208 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/57e04e2ff56e32f923154f0f7bc476fcb596ffe7
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PatchKernel patch commithttps://git.kernel.org/stable/c/64b12dca2b0abcb5fc0542887d18b926ea5cf711
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PatchKernel patch commithttps://git.kernel.org/stable/c/9944c7938cd5b3f37b0afec0481c7c015e4f1c58
Frequently asked questions
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What is CVE-2025-68208?
CVE-2025-68208 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.6.15 onward and has been patched in 6.6.117, 6.12.59, 6.17.9 and others. CVE-2025-68208 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-68208?
Yes — CVE-2025-68208 has been patched. Fixed versions include 6.6.117, 6.12.59, 6.17.9 and others. If you are running Linux kernel 6.6.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-68208 actively exploited?
No — CVE-2025-68208 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.