CVE - CVE-2024-35801

CVE-ID
CVE-2024-35801	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD Commit 672365477ae8 ("x86/fpu: Update XFD state where required") and commit 8bf26758ca96 ("x86/fpu: Add XFD state to fpstate") introduced a per CPU variable xfd_state to keep the MSR_IA32_XFD value cached, in order to avoid unnecessary writes to the MSR. On CPU hotplug MSR_IA32_XFD is reset to the init_fpstate.xfd, which wipes out any stale state. But the per CPU cached xfd value is not reset, which brings them out of sync. As a consequence a subsequent xfd_update_state() might fail to update the MSR which in turn can result in XRSTOR raising a #NM in kernel space, which crashes the kernel. To fix this, introduce xfd_set_state() to write xfd_state together with MSR_IA32_XFD, and use it in all places that set MSR_IA32_XFD.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/10e4b5166df9ff7a2d5316138ca668b42d004422 URL:https://git.kernel.org/stable/c/10e4b5166df9ff7a2d5316138ca668b42d004422 MISC:https://git.kernel.org/stable/c/1acbca933313aa866e39996904c9aca4d435c4cd URL:https://git.kernel.org/stable/c/1acbca933313aa866e39996904c9aca4d435c4cd MISC:https://git.kernel.org/stable/c/21c7c00dae55cb0e3810d5f9506b58f68475d41d URL:https://git.kernel.org/stable/c/21c7c00dae55cb0e3810d5f9506b58f68475d41d MISC:https://git.kernel.org/stable/c/92b0f04e937665bde5768f3fcc622dcce44413d8 URL:https://git.kernel.org/stable/c/92b0f04e937665bde5768f3fcc622dcce44413d8 MISC:https://git.kernel.org/stable/c/b61e3b7055ac6edee4be071c52f48c26472d2624 URL:https://git.kernel.org/stable/c/b61e3b7055ac6edee4be071c52f48c26472d2624
Assigning CNA
kernel.org
Date Record Created
20240517	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240517)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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