Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/mm: Do not map lowcore with identity mapping Since the identity mapping is pinned to address zero the lowcore is always also mapped to address zero, this happens regardless of the relocate_lowcore command line option. If the option is specified the lowcore is mapped twice, instead of only once. This means that NULL pointer accesses will succeed instead of causing an exception (low address protection still applies, but covers only parts). To fix this never map the first two pages of physical memory with the identity mapping.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.10.11, < 6.11 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/1d7864acd497cb468a998d44631f84896f885e85Patch
- https://git.kernel.org/stable/c/30bf5728bb217a6d1ba73f44094c9b9c6bc9a567Patch
- https://git.kernel.org/stable/c/93f616ff870a1fb7e84d472cad0af651b18f9f87Patch
FAQ
What is CVE-2025-38733?
CVE-2025-38733 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: s390/mm: Do not map lowcore with identity mapping Since the identity mapping is pinned to address zero the lowcore is always also ...
How severe is CVE-2025-38733?
CVE-2025-38733 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-38733?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.