{"id":"CVE-2025-40174","summary":"x86/mm: Fix SMP ordering in switch_mm_irqs_off()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm: Fix SMP ordering in switch_mm_irqs_off()\n\nStephen noted that it is possible to not have an smp_mb() between\nthe loaded_mm store and the tlb_gen load in switch_mm(), meaning the\nordering against flush_tlb_mm_range() goes out the window, and it\nbecomes possible for switch_mm() to not observe a recent tlb_gen\nupdate and fail to flush the TLBs.\n\n[ dhansen: merge conflict fixed by Ingo ]","modified":"2026-03-20T12:43:12.517085Z","published":"2025-11-12T10:53:49.859Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40174.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0fe5e3f5fb75c5d88dad24dece3ee75e9d87adeb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/83b0177a6c4889b3a6e865da5e21b2c9d97d0551"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40174.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40174"},{"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":"209954cbc7d0ce1a190fc725d20ce303d74d2680"},{"fixed":"0fe5e3f5fb75c5d88dad24dece3ee75e9d87adeb"},{"fixed":"83b0177a6c4889b3a6e865da5e21b2c9d97d0551"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40174.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.14.0"},{"fixed":"6.17.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40174.json"}}],"schema_version":"1.7.5"}