Review reviewHigh

CVE-2025-40331

Linux

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).

CVSS
7.8
EPSS
0.17%
6.30% percentile
CISA KEV
Not listed
Published
2025.12.10
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.17%
Technical severityCVSS 7.8

Vulnerability overview

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 product and versions

Product
Linux
Affected versions
>= 8f840e47f190cbe61a96945c13e9551048d42cef < b106a68df0650b694b254427cd9250c04500edd3, >= 8f840e47f190cbe61a96945c13e9551048d42cef < 3006959371007fc2eae4a078f823c680fa52de1a, >= 8f840e47f190cbe61a96945c13e9551048d42cef < 72e3fea68eac8d088e44c3dd954e843478e9240e, >= 8f840e47f190cbe61a96945c13e9551048d42cef < 584307275b2048991b2e8984962189b6cc0a9b85, >= 8f840e47f190cbe61a96945c13e9551048d42cef < c9119f243d9c0da3c3b5f577a328de3e7ffd1b42, >= 8f840e47f190cbe61a96945c13e9551048d42cef < 2fe08fcaacb7eb019fa9c81db39b2214de216677, >= 8f840e47f190cbe61a96945c13e9551048d42cef < 89eac1e150dbd42963e13d23828cb8c4e0763196, >= 8f840e47f190cbe61a96945c13e9551048d42cef < 95aef86ab231f047bb8085c70666059b58f53c09, >= 4.7
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2025-40331 — Linux | SECUFOCUS NOW