CVE-2024-50128
Description
A flaw was found in the Wireless Wide Area Network (WWAN) subsystem of the Linux kernel. This vulnerability, an out-of-bounds read, occurs when the system incorrectly processes network communication attributes due to an improperly sized variable. A local attacker with low privileges could exploit this to read sensitive information from memory. Successful exploitation could also lead to a system crash, resulting in a denial of service.
Mitigation
To mitigate this issue, prevent the `wwan` kernel module from loading. This can be achieved by creating a modprobe configuration file.
1. Create or edit `/etc/modprobe.d/disable-wwan.conf` with the following content:
install wwan /bin/true2. Rebuild the initramfs using `dracut -f -v` or `mkinitrd -f -v $(uname -r)`.
blacklist wwan
3. Reboot the system for the changes to take effect.
This mitigation will prevent the `wwan` module from being loaded, which may impact functionality relying on Wireless WAN devices. If the system relies on WWAN functionality, this mitigation may not be suitable.
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 | 7.1 | 7.1 | 7.8 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | None | None | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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)
Confidentiality
Technical Impact: Read Memory
An attacker could get secret values such as cryptographic keys, PII, memory addresses, or other information that could be used in additional attacks.
Confidentiality
Technical Impact: Bypass Protection Mechanism
Out-of-bounds memory could contain memory addresses or other information that can be used to bypass ASLR and other protection mechanisms in order to improve the reliability of exploiting a separate weakness for code execution.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An attacker could cause a segmentation fault or crash by causing memory to be read outside of the bounds of the buffer. This is especially likely when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string.
Other
Technical Impact: Varies by Context
The read operation could produce other undefined or unexpected results.
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