{"id":"CVE-2026-64244","summary":"drivers/base/memory: set mem-\u003ealtmap after successful device registration","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers/base/memory: set mem-\u003ealtmap after successful device registration\n\nIf __add_memory_block() fails at xa_store() (under memory pressure for\nexample), device_unregister() is called, which eventually triggers\nmemory_block_release() with mem-\u003ealtmap still set, causing a\nWARN_ON(mem-\u003ealtmap).  This was triggered by modifying virtio-mem driver.\n\nFix this by delaying the assignment of mem-\u003ealtmap until after\n__add_memory_block() has succeeded.","modified":"2026-08-19T03:31:22.501847572Z","published":"2026-07-24T15:29:59.891Z","related":["openSUSE-SU-2026:11476-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64244.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/059ac6252a63edf1cea79bf30bd860a8c264b62c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/22dc0d042f02ce82aa61422ea5f232628bfd9e9c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6c25bf4e44a2b6a14332f952bba0974521f5b72d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/802e113cf120df7208e4c7e604950a85e87120a8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bc3dd82a0ffd488bb902f4c69c3d28fd4088d973"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64244.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64244"},{"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":"1a8c64e110435e44e71bcd50a75663174b575f22"},{"fixed":"802e113cf120df7208e4c7e604950a85e87120a8"},{"fixed":"22dc0d042f02ce82aa61422ea5f232628bfd9e9c"},{"fixed":"6c25bf4e44a2b6a14332f952bba0974521f5b72d"},{"fixed":"bc3dd82a0ffd488bb902f4c69c3d28fd4088d973"},{"fixed":"059ac6252a63edf1cea79bf30bd860a8c264b62c"},{"fixed":"a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64244.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.6.0"},{"fixed":"6.6.144"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.95"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.37"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.1.0"},{"fixed":"7.1.2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64244.json"}}],"schema_version":"1.9.0"}