In the Linux kernel, the following vulnerability has been resolved: bpf: Reject sleepable...
🔗 CVE IDs covered (1)
📋 Description
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.
🔗 References (7)
- https://nvd.nist.gov/vuln/detail/CVE-2026-43010
- https://git.kernel.org/stable/c/dc9a060d76c12b23c5f378ee115d5e5d03d8bbf3
- https://git.kernel.org/stable/c/eb7024bfcc5f68ed11ed9dd4891a3073c15f04a8
- https://git.kernel.org/stable/c/f952157e695fd434bdc05af63a703bb082a78717
- https://git.kernel.org/stable/c/89327ed787746a7aa4db3c97f91d2e294228932b
- https://git.kernel.org/stable/c/d97b19fe5265f7901b2c862f88a4eb1b129a0b61
- https://github.com/advisories/GHSA-vmmg-rqjm-j9p9