CVE-2025-21693
Public on 2025-02-10
Modified on 2025-06-17
Description
In the Linux kernel, the following vulnerability has been resolved:
mm: zswap: properly synchronize freeing resources during CPU hotunplug
CVE-2025-21693 is a vulnerability in the zswap subsystem of the Linux kernel. Amazon Linux has evaluated the CVE and consider this can only be triggered in rare situations. Considering the operational risk of a backport, Amazon Linux is not going to provide a fix for this CVE at this time.
References:
1. https://www.kernel.org/doc/html/v4.18/vm/zswap.html
2. https://www.kernel.org/doc/gorman/html/understand/understand014.html
3. https://nvd.nist.gov/vuln/detail/CVE-2025-21693
mm: zswap: properly synchronize freeing resources during CPU hotunplug
CVE-2025-21693 is a vulnerability in the zswap subsystem of the Linux kernel. Amazon Linux has evaluated the CVE and consider this can only be triggered in rare situations. Considering the operational risk of a backport, Amazon Linux is not going to provide a fix for this CVE at this time.
References:
1. https://www.kernel.org/doc/html/v4.18/vm/zswap.html
2. https://www.kernel.org/doc/gorman/html/understand/understand014.html
3. https://nvd.nist.gov/vuln/detail/CVE-2025-21693
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 1 | kernel | Not Affected | ||
| Amazon Linux 2 - Core | kernel | Not Affected | ||
| Amazon Linux 2 - Kernel-5.10 Extra | kernel | Not Affected | ||
| Amazon Linux 2 - Kernel-5.4 Extra | kernel | Not Affected | ||
| Amazon Linux 2 - Kernel-5.15 Extra | kernel | No Fix Planned | ||
| Amazon Linux 2023 | kernel | No Fix Planned |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | CVSSv3 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |