CVE-2026-43010
Full vulnerability record from the local CVENow database.
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.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-01 15:16:44.887000
Last modified
2026-10-30 13:18:44.187000
View original CVE JSON
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-05-01T15:16:44.887",
"lastModified": "2026-10-30T13:18:44.187",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject sleepable kprobe_multi programs at attach time\n\nkprobe.multi programs run in atomic/RCU context and cannot sleep.\nHowever, bpf_kprobe_multi_link_attach() did not validate whether the\nprogram being attached had the sleepable flag set, allowing sleepable\nhelpers such as bpf_copy_from_user() to be invoked from a non-sleepable\ncontext.\n\nThis causes a \"sleeping function called from invalid context\" splat:\n\n BUG: sleeping function called from invalid context at ./include/linux/uaccess.h:169\n in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1787, name: sudo\n preempt_count: 1, expected: 0\n RCU nest depth: 2, expected: 0\n\nFix this by rejecting sleepable programs early in\nbpf_kprobe_multi_link_attach(), before any further processing."
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