{"id":"CVE-2023-53169","summary":"x86/resctrl: Clear staged_config[] before and after it is used","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/resctrl: Clear staged_config[] before and after it is used\n\nAs a temporary storage, staged_config[] in rdt_domain should be cleared\nbefore and after it is used. The stale value in staged_config[] could\ncause an MSR access error.\n\nHere is a reproducer on a system with 16 usable CLOSIDs for a 15-way L3\nCache (MBA should be disabled if the number of CLOSIDs for MB is less than\n16.) :\n\tmount -t resctrl resctrl -o cdp /sys/fs/resctrl\n\tmkdir /sys/fs/resctrl/p{1..7}\n\tumount /sys/fs/resctrl/\n\tmount -t resctrl resctrl /sys/fs/resctrl\n\tmkdir /sys/fs/resctrl/p{1..8}\n\nAn error occurs when creating resource group named p8:\n    unchecked MSR access error: WRMSR to 0xca0 (tried to write 0x00000000000007ff) at rIP: 0xffffffff82249142 (cat_wrmsr+0x32/0x60)\n    Call Trace:\n     \u003cIRQ\u003e\n     __flush_smp_call_function_queue+0x11d/0x170\n     __sysvec_call_function+0x24/0xd0\n     sysvec_call_function+0x89/0xc0\n     \u003c/IRQ\u003e\n     \u003cTASK\u003e\n     asm_sysvec_call_function+0x16/0x20\n\nWhen creating a new resource control group, hardware will be configured\nby the following process:\n    rdtgroup_mkdir()\n      rdtgroup_mkdir_ctrl_mon()\n        rdtgroup_init_alloc()\n          resctrl_arch_update_domains()\n\nresctrl_arch_update_domains() iterates and updates all resctrl_conf_type\nwhose have_new_ctrl is true. Since staged_config[] holds the same values as\nwhen CDP was enabled, it will continue to update the CDP_CODE and CDP_DATA\nconfigurations. When group p8 is created, get_config_index() called in\nresctrl_arch_update_domains() will return 16 and 17 as the CLOSIDs for\nCDP_CODE and CDP_DATA, which will be translated to an invalid register -\n0xca0 in this scenario.\n\nFix it by clearing staged_config[] before and after it is used.\n\n[reinette: re-order commit tags]","modified":"2026-07-15T01:48:58.475765129Z","published":"2025-09-15T14:04:02.395Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53169.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0424a7dfe9129b93f29b277511a60e87f052ac6b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3fc5941ecc31a495b6b84b465f36155009db99b5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/86db319d25db70cf4af4557e05f6fa6f39c70003"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8ecc60ef9318f0d533b866fa421858cc185bccfc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53169.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53169"},{"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":"75408e43509ed6207870c0e7e28656acbbc1f7fd"},{"fixed":"86db319d25db70cf4af4557e05f6fa6f39c70003"},{"fixed":"3fc5941ecc31a495b6b84b465f36155009db99b5"},{"fixed":"8ecc60ef9318f0d533b866fa421858cc185bccfc"},{"fixed":"0424a7dfe9129b93f29b277511a60e87f052ac6b"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53169.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"5.15.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.21"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.2.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53169.json"}}],"schema_version":"1.7.5"}