CVE-2025-38047
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-06-18

Last updated on: 2025-11-14

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: x86/fred: Fix system hang during S4 resume with FRED enabled Upon a wakeup from S4, the restore kernel starts and initializes the FRED MSRs as needed from its perspective. It then loads a hibernation image, including the image kernel, and attempts to load image pages directly into their original page frames used before hibernation unless those frames are currently in use. Once all pages are moved to their original locations, it jumps to a "trampoline" page in the image kernel. At this point, the image kernel takes control, but the FRED MSRs still contain values set by the restore kernel, which may differ from those set by the image kernel before hibernation. Therefore, the image kernel must ensure the FRED MSRs have the same values as before hibernation. Since these values depend only on the location of the kernel text and data, they can be recomputed from scratch.
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Meta Information
Published
2025-06-18
Last Modified
2025-11-14
Generated
2026-05-07
AI Q&A
2025-06-18
EPSS Evaluated
2026-05-05
NVD
CVE-2025-38047
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-NVD-CWE-noinfo
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability involves the Linux kernel's handling of the FRED MSRs during system resume from S4 (hibernation). When the system wakes up, the restore kernel initializes FRED MSRs and loads the hibernation image, including the image kernel. However, the FRED MSRs still contain values set by the restore kernel, which may differ from those expected by the image kernel before hibernation. This mismatch can cause the system to hang during resume. The fix ensures that the image kernel recomputes and sets the FRED MSRs to the correct values based on the kernel's text and data locations, preventing the hang.


How can this vulnerability impact me? :

This vulnerability can cause the system to hang during resume from hibernation (S4 state) when FRED is enabled on x86 systems. This means that after entering hibernation, the system may fail to resume properly, leading to downtime and potential loss of unsaved data.


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