CVE-2024-50209
Description
A flaw was found in the RDMA/bnxt_re component of the Linux kernel. This vulnerability occurs because the driver fails to check the return status of a memory allocation function, __alloc_pbl(). A local attacker with administrative privileges could exploit this flaw, potentially leading to system instability or a denial of service.
Statement
This issue is considered to be a moderate impact flaw, as the exploitation for this will need an ADMIN (or ROOT) privilege (PR:H).
Mitigation
If RDMA functionality provided by the `bnxt_re` kernel module is not required, the module can be prevented from loading to mitigate this vulnerability.
To blacklist the `bnxt_re` module:
1. Create a file `/etc/modprobe.d/blacklist-bnxt_re.conf` with the following content:
blacklist bnxt_re2. Regenerate the initramfs:
install bnxt_re /bin/true
- For RHEL 8/9: `dracut -f -v`
- For RHEL 7: `dracut -f`
3. Reboot the system for the changes to take effect.
This mitigation will disable any functionality relying on the `bnxt_re` RDMA driver.
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 | 6.7 | 7.8 | 7.8 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | High | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | High | High | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Availability,Integrity
Technical Impact: Unexpected State; DoS: Crash, Exit, or Restart
An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors.
Frequently Asked Questions
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