CVE-2023-54048
Description
A flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) bnxt_re driver. A local user could exploit a race condition that occurs when a Queue Pair (QP) is destroyed, but completion queue (CQ) polling continues. This can lead to a kernel panic, resulting in a Denial of Service (DoS) on the system.
Mitigation
To mitigate this issue, prevent the `bnxt_re` kernel module from loading if RDMA functionality with Broadcom NetXtreme-E hardware is not required. Create a blacklist file:
echo "blacklist bnxt_re" > /etc/modprobe.d/bnxt_re.conf
After creating the file, regenerate the initramfs and reboot the system for the changes to take effect. This may impact systems relying on the `bnxt_re` driver for RDMA operations.
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 | 5.9 | N/A | 7.8 |
| Attack Vector | Network | N/A | Local |
| Attack Complexity | High | N/A | Low |
| Privileges Required | None | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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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