CVE-2026-43010

Summary

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

bpf: Reject sleepable kprobe_multi programs at attach time

kprobe.multi programs run in atomic/RCU context and cannot sleep. However, bpf_kprobe_multi_link_attach() did not validate whether the program being attached had the sleepable flag set, allowing sleepable helpers such as bpf_copy_from_user() to be invoked from a non-sleepable context.

This causes a "sleeping function called from invalid context" splat:

BUG: sleeping function called from invalid context at ./include/linux/uaccess.h:169 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1787, name: sudo preempt_count: 1, expected: 0 RCU nest depth: 2, expected: 0

Fix this by rejecting sleepable programs early in bpf_kprobe_multi_link_attach(), before any further processing.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/89327ed787746a7aa4db3c97f91d2e294228932b
• https://git.kernel.org/stable/c/d97b19fe5265f7901b2c862f88a4eb1b129a0b61
• https://git.kernel.org/stable/c/dc9a060d76c12b23c5f378ee115d5e5d03d8bbf3
• https://git.kernel.org/stable/c/f952157e695fd434bdc05af63a703bb082a78717
• https://git.kernel.org/stable/c/eb7024bfcc5f68ed11ed9dd4891a3073c15f04a8

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