CVE-2023-53496

Advisory lineage Upstream: 0 Downstream: 19
Analyzed
Published: 01 Oct 2025, 11:45
Last modified:11 May 2026, 19:46

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.02% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

01 Oct 2025, 11:45
Published
Vulnerability first disclosed
11 May 2026, 19:46
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: x86/platform/uv: Use alternate source for socket to node data The UV code attempts to build a set of tables to allow it to do bidirectional socket<=>node lookups. But when nr_cpus is set to a smaller number than actually present, the cpu_to_node() mapping information for unused CPUs is not available to build_socket_tables(). This results in skipping some nodes or sockets when creating the tables and leaving some -1's for later code to trip. over, causing oopses. The problem is that the socket<=>node lookups are created by doing a loop over all CPUs, then looking up the CPU's APICID and socket. But if a CPU is not present, there is no way to start this lookup. Instead of looping over all CPUs, take CPUs out of the equation entirely. Loop over all APICIDs which are mapped to a valid NUMA node. Then just extract the socket-id from the APICID. This avoid tripping over disabled CPUs.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 6%

Affected Systems

  • linux•linux

    ≥ 8a50c58519271dd24ba760bb282875f6ad66ee71, < 0d01a0c3046d1545391ef7bb1f114743d00e3793 | ≥ 8a50c58519271dd24ba760bb282875f6ad66ee71, < 5290e88ba2c742ca77c5f5b690e5af549cfd8591 | 6.5

  • linux•linux_kernel

    ≥ 6.5, < 6.5.5 | 6.6:rc1

References (2)