CVE-2023-53421 — In the Linux kernel, the following vulnerability has been resolved:

In the Linux kernel, the following vulnerability has been resolved:

01What is this vulnerability?

In the Linux kernel, the following vulnerability has been resolved:

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-09-18T16:15:45.897
• Last modified: 2026-06-01T17:16:25.097

09References

• git.kernel.org — https://git.kernel.org/stable/c/0561aa6033dd181594116d705c41fc16e97161a2
• git.kernel.org — https://git.kernel.org/stable/c/3d2af77e31ade05ff7ccc3658c3635ec1bea0979
• git.kernel.org — https://git.kernel.org/stable/c/58c135513562698f222a58ba07dbdfcfb268aa0d
• git.kernel.org — https://git.kernel.org/stable/c/892faa76be894d324bf48b12a55c7af7be2bad83
• git.kernel.org — https://git.kernel.org/stable/c/abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2
• git.kernel.org — https://git.kernel.org/stable/c/b0d26283af612b9e0cc3188b0b88ad7fdea447e8