CVE-2024-47696
Description
A denial of service (DoS) vulnerability was found in the Linux kernel. The flush_workqueue function is invoked to flush the iwcm_wq work queue, but at that time, the iwcm_wq work queue is created via the alloc_ordered_workqueue function without the WQ_MEM_RECLAIM flag. Since the current process is trying to flush the whole iwcm_wq, if iwcm_wq doesn't have the WQ_MEM_RECLAIM flag, a work queue which doesn't have the WQ_MEM_RECLAIM flag can break forward-progress guarantee, leading to a deadlock.
Statement
This vulnerability results in a deadlock condition; it cannot be used to exploit confidentiality or integrity of the system and can only lead to denial of service, which is why CVSS has been marked as such.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | 7.8 | 7.5 |
| Attack Vector | Local | Local | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | Low | Low | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | High | None |
| Integrity Impact | None | High | None |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat CVSS v3 Score Explanation
This vulnerability results in a deadlock condition,such that it cannot be used to exploit confidentiality or integrity of the system and can only lead to denial of service,which is why CVSS has been marked as such
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Other); DoS: Crash, Exit, or Restart
Each thread of execution will "hang" and prevent tasks from completing. In some cases, CPU consumption may occur if a lock check occurs in a tight loop.
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