Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: use array_index_nospec with indices that come from guest min and dest_id are guest-controlled indices. Using array_index_nospec() after the bounds checks clamps these values to mitigate speculative execution side-channels.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.19, < 5.4.298 |
| Debian | Debian Linux | 11.0 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974Patch
- https://git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985fPatch
- https://git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695Patch
- https://git.kernel.org/stable/c/72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48Patch
- https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548Patch
- https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12Patch
- https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69Patch
- https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fbPatch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing ListThird Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
FAQ
What is CVE-2025-39823?
CVE-2025-39823 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: KVM: x86: use array_index_nospec with indices that come from guest min and dest_id are guest-controlled indices. Using array_index...
How severe is CVE-2025-39823?
CVE-2025-39823 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-39823?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.