{"id":"CVE-2026-43344","summary":"perf/x86/intel/uncore: Fix die ID init and look up bugs","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/intel/uncore: Fix die ID init and look up bugs\n\nIn snbep_pci2phy_map_init(), in the nr_node_ids \u003e 8 path,\nuncore_device_to_die() may return -1 when all CPUs associated\nwith the UBOX device are offline.\n\nRemove the WARN_ON_ONCE(die_id == -1) check for two reasons:\n\n- The current code breaks out of the loop. This is incorrect because\n  pci_get_device() does not guarantee iteration in domain or bus order,\n  so additional UBOX devices may be skipped during the scan.\n\n- Returning -EINVAL is incorrect, since marking offline buses with\n  die_id == -1 is expected and should not be treated as an error.\n\nSeparately, when NUMA is disabled on a NUMA-capable platform,\npcibus_to_node() returns NUMA_NO_NODE, causing uncore_device_to_die()\nto return -1 for all PCI devices.  As a result,\nspr_update_device_location(), used on Intel SPR and EMR, ignores the\ncorresponding PMON units and does not add them to the RB tree.\n\nFix this by using uncore_pcibus_to_dieid(), which retrieves topology\nfrom the UBOX GIDNIDMAP register and works regardless of whether NUMA\nis enabled in Linux.  This requires snbep_pci2phy_map_init() to be\nadded in spr_uncore_pci_init().\n\nKeep uncore_device_to_die() only for the nr_node_ids \u003e 8 case, where\nNUMA is expected to be enabled.","modified":"2026-06-18T03:55:41.592406521Z","published":"2026-05-08T13:39:30.537Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43344.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/6a5dc3ee97581da2907fc7acd62853f07184de67"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a16d1ec4dd0cdcf689f324adde6067083bce9099"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43344.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43344"},{"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":"9a7832ce3d920426a36cdd78eda4b3568d4d09e3"},{"fixed":"6a5dc3ee97581da2907fc7acd62853f07184de67"},{"fixed":"a16d1ec4dd0cdcf689f324adde6067083bce9099"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43344.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.12.0"},{"fixed":"6.19.14"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43344.json"}}],"schema_version":"1.7.5"}