CVE-2024-56768

bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP

State: Published
Severity: 5.5 Medium
Published: Jan 6, 2025
Updated: May 11, 2026
Reserved: Dec 29, 2024

Description

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

bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP

On x86-64 calling bpf_get_smp_processor_id() in a kernel with CONFIG_SMP disabled can trigger the following bug, as pcpu_hot is unavailable:

[ 8.471774] BUG: unable to handle page fault for address: 00000000936a290c [ 8.471849] #PF: supervisor read access in kernel mode [ 8.471881] #PF: error_code(0x0000) - not-present page

Fix by inlining a return 0 in the !CONFIG_SMP case.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1ae6921009e5d72787e07ccc04754514ccf6bc99 to before f4ab7d74247b0150547cf909b3f6f24ee85183dfAffected 1ae6921009e5d72787e07ccc04754514ccf6bc99 to before 23579010cf0a12476e96a5f1acdf78a9c5843657Affected
LinuxLinux	6.10Affected before 6.10Not affected 6.12.8 through 6.12.*Not affected 6.13 and laterNot affected

References

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