CVE-2026-98045

Summary

In the Linux kernel, the following vulnerability has been resolved:

bpf: Mark faultable stack helpers as sleepable

The faultable variants of bpf_get_stack() and bpf_get_task_stack() pass may_fault=true into the common stack collection code. Resolving user-space build IDs may then call build_id_parse_file() and block on filesystem reads.

Neither helper prototype sets might_sleep. Since prototype selection uses the sleepability of the whole program, the verifier can still allow these helpers from a non-sleepable region within that program, such as an explicit RCU or preemption-disabled region. The task-stack helper can also be called from a non-sleepable timer callback of a sleepable program.

Mark both faultable prototypes as sleepable. The existing helper context check then rejects these calls while continuing to allow them in genuinely sleepable contexts.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/44b8d370f2725bad215da3e67668e98ba96671bd
• https://git.kernel.org/stable/c/3014e8a8bdad55075d89836ad9c10710a9a69837
• https://git.kernel.org/stable/c/19e8d5a98afd071d8c1c5adeccf92b3c42eddc70
• https://git.kernel.org/stable/c/9d02927fdf4e930893c92e35fed01a2704496900

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