{"id":"CVE-2024-35801","summary":"x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/fpu: Keep xfd_state in sync with MSR_IA32_XFD\n\nCommit 672365477ae8 (\"x86/fpu: Update XFD state where required\") and\ncommit 8bf26758ca96 (\"x86/fpu: Add XFD state to fpstate\") introduced a\nper CPU variable xfd_state to keep the MSR_IA32_XFD value cached, in\norder to avoid unnecessary writes to the MSR.\n\nOn CPU hotplug MSR_IA32_XFD is reset to the init_fpstate.xfd, which\nwipes out any stale state. But the per CPU cached xfd value is not\nreset, which brings them out of sync.\n\nAs a consequence a subsequent xfd_update_state() might fail to update\nthe MSR which in turn can result in XRSTOR raising a #NM in kernel\nspace, which crashes the kernel.\n\nTo fix this, introduce xfd_set_state() to write xfd_state together\nwith MSR_IA32_XFD, and use it in all places that set MSR_IA32_XFD.","modified":"2026-04-02T11:51:06.585893Z","published":"2024-05-17T13:23:10.830Z","related":["ALSA-2024:5101","ALSA-2024:5102","SUSE-SU-2024:2008-1","SUSE-SU-2024:2019-1","SUSE-SU-2024:2135-1","SUSE-SU-2024:2190-1","SUSE-SU-2024:2203-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1","SUSE-SU-2025:20166-1","SUSE-SU-2025:20249-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/35xxx/CVE-2024-35801.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/10e4b5166df9ff7a2d5316138ca668b42d004422"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1acbca933313aa866e39996904c9aca4d435c4cd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/21c7c00dae55cb0e3810d5f9506b58f68475d41d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/92b0f04e937665bde5768f3fcc622dcce44413d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b61e3b7055ac6edee4be071c52f48c26472d2624"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/35xxx/CVE-2024-35801.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-35801"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"672365477ae8afca5a1cca98c1deb733235e4525"},{"fixed":"21c7c00dae55cb0e3810d5f9506b58f68475d41d"},{"fixed":"1acbca933313aa866e39996904c9aca4d435c4cd"},{"fixed":"92b0f04e937665bde5768f3fcc622dcce44413d8"},{"fixed":"b61e3b7055ac6edee4be071c52f48c26472d2624"},{"fixed":"10e4b5166df9ff7a2d5316138ca668b42d004422"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-35801.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}