PT-2025-51584 · Linux+3 · Linux Kernel+3
Published
2025-12-16
·
Updated
2026-05-26
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CVE-2025-68171
None
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Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The Linux kernel contains an issue related to the handling of the XFD state during signal delivery. Specifically, when a non-AMX task is preempted by an AMX-enabled task that modifies the XFD MSR, a mismatch can occur between the
fpstate::xfd and the CPU’s current XFD state upon resumption of the non-AMX task. The fpu clear user states() function does not currently re-synchronize the XFD state in such scenarios. This can lead to warnings or unexpected behavior. The issue is addressed by invoking xfd update state(), which detects and corrects the mismatch when a dynamic feature is present. This also improves the sigreturn path, as fpu restore sig() may call fpu clear user states() when the sigframe is inaccessible. The vulnerable function is fpu clear user states().Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
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Related Identifiers
Affected Products
Debian
Linuxmint
Linux Kernel
Ubuntu