CVE-2024-56768

bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP

Medium · published January 6, 2025

CVSS v3.1
5.5
EPSS
0%
Percentile
6.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00177 · 6.9th percentile
Published
2025-01-06T16:20Z
EPSS history
Timeline
  • 06 JAN 16:20Z
    bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP
    cvelistv5