What’s Vulnerable › Vulnerabilities

CVE-2025-40331: sctp: Prevent TOCTOU out-of-bounds write

• Severity: high (CVSS 7.8 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: 2025-12-09 · updated 2026-10-14

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: Prevent TOCTOU out-of-bounds write For the following path not holding the sock lock, sctp_diag_dump() -> sctp_for_each_endpoint() -> sctp_ep_dump() make sure not to exceed bounds in case the address list has grown between buffer allocation (time-of-check) and write (time-of-use).

Affected products

• Linux kernel: 4.7 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2fe08fcaacb7eb019fa9c81db39b2214de216677
• https://git.kernel.org/stable/c/3006959371007fc2eae4a078f823c680fa52de1a
• https://git.kernel.org/stable/c/584307275b2048991b2e8984962189b6cc0a9b85
• https://git.kernel.org/stable/c/72e3fea68eac8d088e44c3dd954e843478e9240e
• https://git.kernel.org/stable/c/89eac1e150dbd42963e13d23828cb8c4e0763196
• https://git.kernel.org/stable/c/95aef86ab231f047bb8085c70666059b58f53c09
• https://git.kernel.org/stable/c/b106a68df0650b694b254427cd9250c04500edd3
• https://git.kernel.org/stable/c/c9119f243d9c0da3c3b5f577a328de3e7ffd1b42

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