CVE-2024-50185
Description
A flaw was found in the kernel. A remote attacker can send malformed Data-path Service Sublayer (DSS) options within MultiPath TCP (MPTCP) connections. This can lead to a denial of service, causing the system to log debugging information and potentially reset or fallback subflows, disrupting network communication.
Mitigation
To mitigate this issue, ensure that the MPTCP kernel module is not loaded. This can be achieved by blacklisting the `mptcp` module.
1. Create a file `/etc/modprobe.d/blacklist-mptcp.conf` with the following content:
`blacklist mptcp`
2. Regenerate the initramfs:
- For Red Hat Enterprise Linux 8 and 9:
`dracut -f -v`
- For Red Hat Enterprise Linux 7:
`mkinitrd -f -v /boot/initramfs-$(uname -r).img $(uname -r)`
3. Reboot the system for the changes to take effect.
This mitigation may impact applications that rely on MPTCP functionality.
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 | 5.5 | 8.2 |
| 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 | None | None |
| Integrity Impact | None | None | Low |
| 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:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
An attacker could provide unexpected values and cause a program crash or arbitrary control of resource allocation, leading to excessive consumption of resources such as memory and CPU.
Confidentiality
Technical Impact: Read Memory; Read Files or Directories
An attacker could read confidential data if they are able to control resource references.
Integrity,Confidentiality,Availability
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
An attacker could use malicious input to modify data or possibly alter control flow in unexpected ways, including arbitrary command execution.
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