CVE-2023-53199
Description
This is a denial-of-service bug in the HSR handling path: a crafted or malformed HSR frame may corrupt SKB metadata and lead to an skb_under_panic / kernel BUG. It requires the host to be able to deliver HSR frames to the victim (same L2 / bridge/HSR topology). This is not a universal network hole — it only affects systems using the HSR stack/driver (CONFIG_HSR / net/hsr). The bug causes a kernel panic (availability impact) by corrupting skb header/tags and hitting an skb_push()/skb_panic path. There is no indication of arbitrary memory write or control over instruction flow, so remote code execution or reliable memory corruption for privilege escalation is unlikely.
Statement
Fixed in Red Hat Enterprise Linux 9.3 (and later versions) and fixed in Red Hat Enterprise Linux 8.9 (and later versions).
Mitigation
To mitigate this issue, prevent module ath9k_hw from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
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 | 6.5 | 5.5 | N/A |
| Attack Vector | Adjacent Network | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:A/AC:L/PR:N/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:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (Other); DoS: Resource Consumption (Memory); DoS: Resource Consumption (CPU)
An attacker that can influence the allocation of resources that are not properly released could deplete the available resource pool and prevent all other processes from accessing the same type of resource. Frequently-affected resources include memory, CPU, disk space, power or battery, etc.
Frequently Asked Questions
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