CVE-2023-6931 Debian CVE debrief

Who should care

Linux kernel maintainers, distribution security teams, fleet operators, and administrators responsible for servers, desktops, containers, or appliances that expose vulnerable kernel builds. Security teams should prioritize systems where untrusted local users, multi-tenant workloads, or developer access increase the value of local privilege escalation.

Technical summary

The vulnerability is described as a heap out-of-bounds write in the Linux kernel's Performance Events system. A perf_event read_size can overflow, which then leads to an out-of-bounds increment or write in perf_read_group(). NVD maps the weakness to CWE-787 and assigns CVSS 3.1 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating meaningful local impact once an attacker can reach the vulnerable code path. The supplied remediation pointer is kernel commit 382c27f4ed28f803b1f1473ac2d8db0afc795a1b.

Defensive priority

High. The vulnerability is locally exploitable and can result in privilege escalation, so it should be treated as a priority kernel update for any affected fleet, especially multi-user or exposed systems.

Recommended defensive actions

• Upgrade to a kernel build that includes commit 382c27f4ed28f803b1f1473ac2d8db0afc795a1b.
• Confirm whether your Linux kernel version falls within the affected range listed by NVD (4.3 through before 6.7) or matches any vendor-specific affected release.
• Use vendor or distribution advisories, including the referenced Debian LTS notices, to identify the correct backported fix for your platform.
• Prioritize patching systems with local user access, shared hosts, developer workstations, and multi-tenant environments.
• After remediation, verify the running kernel build and document the fixed version in asset inventories and patch records.

Evidence notes

This debrief is based on the NVD CVE record and its embedded references. The vulnerability description states that a perf_event read_size overflow can cause an heap out-of-bounds increment/write in perf_read_group(). NVD lists CVSS 3.1 7.8 and CWE-787, and provides the fix reference to Linux kernel commit 382c27f4ed28f803b1f1473ac2d8db0afc795a1b. The CVE was published on 2023-12-19 and later modified on 2026-05-12. Debian LTS advisory links are present in the source corpus, but their contents were not provided here.

Official resources