CVE-2024-45009
Description
A flaw was found in the Linux kernel's Multipath TCP (MPTCP) path manager. A remote attacker could potentially exploit an issue where the add_addr_accepted counter is incorrectly decremented during subflow removal. This can lead to an inconsistent state within the MPTCP connection, potentially resulting in a denial of service.
Mitigation
To mitigate this issue, disable the Multipath TCP (MPTCP) kernel module if it is not required. This prevents the vulnerable code path from being loaded.
To blacklist the `mptcp` module:
1. Create `/etc/modprobe.d/disable-mptcp.conf` with:
blacklist mptcp2. Regenerate the initramfs:
install mptcp /bin/true
bashor `mkinitrd -f /boot/initramfs-$(uname -r).img $(uname -r)`
dracut -f -v
3. Reboot the system.
Alternatively, disable MPTCP at runtime:
bashFor persistent disablement, add `net.mptcp.enabled = 0` to `/etc/sysctl.conf` or a file in `/etc/sysctl.d/`. A system reboot or service reload may be required for changes to take full effect.
sysctl -w net.mptcp.enabled=0
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 | 5.5 | 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)
Other
Technical Impact: Other
Frequently Asked Questions
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