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.
Affected products
linux: linux kernel
References6
- git.kernel.org/stable/c/dc9a060d76c12b23c5f378ee115d5e5d03d8bbf3 Patch
- git.kernel.org/stable/c/eb7024bfcc5f68ed11ed9dd4891a3073c15f04a8 Patch
- git.kernel.org/stable/c/f952157e695fd434bdc05af63a703bb082a78717 Patch
- git.kernel.org/stable/c/89327ed787746a7aa4db3c97f91d2e294228932b
- git.kernel.org/stable/c/c2b5e13dee9cc83e664daf4c13077dcc618a44e9
- git.kernel.org/stable/c/d97b19fe5265f7901b2c862f88a4eb1b129a0b61
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 2 · as of 13 November 2026
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