{"id":"CVE-2022-50093","summary":"iommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE)","details":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE)\n\nKASAN reports:\n\n[ 4.668325][ T0] BUG: KASAN: wild-memory-access in dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497)\n[    4.676149][    T0] Read of size 8 at addr 1fffffff85115558 by task swapper/0/0\n[    4.683454][    T0]\n[    4.685638][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-00004-g0e862838f290 #1\n[    4.694331][    T0] Hardware name: Supermicro SYS-5018D-FN4T/X10SDV-8C-TLN4F, BIOS 1.1 03/02/2016\n[    4.703196][    T0] Call Trace:\n[    4.706334][    T0]  \u003cTASK\u003e\n[ 4.709133][ T0] ? dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497)\n\nafter converting the type of the first argument (@nr, bit number)\nof arch_test_bit() from `long` to `unsigned long`[0].\n\nUnder certain conditions (for example, when ACPI NUMA is disabled\nvia command line), pxm_to_node() can return %NUMA_NO_NODE (-1).\nIt is valid 'magic' number of NUMA node, but not valid bit number\nto use in bitops.\nnode_online() eventually descends to test_bit() without checking\nfor the input, assuming it's on caller side (which might be good\nfor perf-critical tasks). There, -1 becomes %ULONG_MAX which leads\nto an insane array index when calculating bit position in memory.\n\nFor now, add an explicit check for @node being not %NUMA_NO_NODE\nbefore calling test_bit(). The actual logics didn't change here\nat all.\n\n[0] https://github.com/norov/linux/commit/0e862838f290147ea9c16db852d8d494b552d38d","modified":"2026-04-03T13:14:25.178598527Z","published":"2025-06-18T11:02:31.966Z","related":["SUSE-SU-2025:02264-1","SUSE-SU-2025:02308-1","SUSE-SU-2025:02320-1","SUSE-SU-2025:02321-1","SUSE-SU-2025:02322-1","SUSE-SU-2025:02334-1","SUSE-SU-2025:02537-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50093.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0b4c0003aeda32a600f95df53b2848da8a5aa3fa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5659efdadf04b56707d58c1b758df16d2e0eff2c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/73ce2046e04ad488cecc66757c36cbe1bdf089d4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b0b0b77ea611e3088e9523e60860f4f41b62b235"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b12304984654d8e58a2b22ff94c4410906d6267f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c2304c50f4d94f56c2e326f25c9dc8cf2ba6f5fa"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50093.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50093"},{"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":"ee34b32d8c2950f66038c8975747ef9aec855289"},{"fixed":"b12304984654d8e58a2b22ff94c4410906d6267f"},{"fixed":"5659efdadf04b56707d58c1b758df16d2e0eff2c"},{"fixed":"0b4c0003aeda32a600f95df53b2848da8a5aa3fa"},{"fixed":"73ce2046e04ad488cecc66757c36cbe1bdf089d4"},{"fixed":"c2304c50f4d94f56c2e326f25c9dc8cf2ba6f5fa"},{"fixed":"b0b0b77ea611e3088e9523e60860f4f41b62b235"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-50093.json"}}],"schema_version":"1.7.5"}