CVE-2023-54006
Description
A data race condition was found in the Linux kernel's AF_UNIX socket implementation. The unix_tot_inflight variable is modified under spin_lock(unix_gc_lock) but read without synchronization in unix_release_sock(). This was detected by KCSAN (Kernel Concurrency Sanitizer). The fix adds READ_ONCE() to ensure proper atomic reading of the shared variable.
Statement
This is a theoretical data race found by KCSAN that affects the unix_tot_inflight counter in AF_UNIX socket garbage collection. The race involves a concurrent read during socket release while another thread modifies the counter. While technically a data race, the practical impact is minimal since the counter is used for heuristic checks, not critical decisions. The fix adds proper memory ordering annotations.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Integrity,Other
Technical Impact: Alter Execution Logic; Unexpected State
The main problem is that -- if a lock is overcome -- data could be altered in a bad state.
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