What’s Vulnerable › Vulnerabilities

CVE-2024-27418: net: mctp: take ownership of skb in mctp_local_output

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-17 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: net: mctp: take ownership of skb in mctp_local_output Currently, mctp_local_output only takes ownership of skb on success, and we may leak an skb if mctp_local_output fails in specific states; the skb ownership isn't transferred until the actual output routing occurs. Instead, make mctp_local_output free the skb on all error paths up to the route action, so it always consumes the passed skb.

Affected products

• Linux kernel: from 5.15 before 6.1.81; from 6.2 before 6.6.21; from 6.7 before 6.7.9; 6.8-rc1, 6.8-rc2, 6.8-rc3, 6.8-rc4, 6.8-rc5, 6.8-rc6 — fixed in 6.1.81, 6.6.21, 6.7.9

How to fix

Upgrade to a fixed version: Linux kernel 6.1.81, 6.6.21, 6.7.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3773d65ae5154ed7df404b050fd7387a36ab5ef3
• https://git.kernel.org/stable/c/a3c8fa54e904b0ddb52a08cc2d8ac239054f61fd
• https://git.kernel.org/stable/c/a639441c880ac479495e5ab37e3c29f21ae5771b
• https://git.kernel.org/stable/c/cbebc55ceacef1fc0651e80e0103cc184552fc68
• https://git.kernel.org/stable/c/3773d65ae5154ed7df404b050fd7387a36ab5ef3
• https://git.kernel.org/stable/c/a3c8fa54e904b0ddb52a08cc2d8ac239054f61fd
• https://git.kernel.org/stable/c/a639441c880ac479495e5ab37e3c29f21ae5771b
• https://git.kernel.org/stable/c/cbebc55ceacef1fc0651e80e0103cc184552fc68

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