{"id":"CVE-2026-64244","title":"drivers/base/memory: set mem->altmap after successful device registration","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers/base/memory: set mem->altmap after successful device registration\n\nIf __add_memory_block() fails at xa_store() (under memory pressure for\nexample), device_unreg…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < 802e113cf120df7208e4c7e604950a85e87120a8","Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < 22dc0d042f02ce82aa61422ea5f232628bfd9e9c","Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < 6c25bf4e44a2b6a14332f952bba0974521f5b72d","Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < bc3dd82a0ffd488bb902f4c69c3d28fd4088d973","Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < 059ac6252a63edf1cea79bf30bd860a8c264b62c","Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a","Linux 6.6"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:32:52.837206Z"},"published":"2026-07-24","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:34:31.181Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64244","references":[{"url":"https://git.kernel.org/stable/c/802e113cf120df7208e4c7e604950a85e87120a8"},{"url":"https://git.kernel.org/stable/c/22dc0d042f02ce82aa61422ea5f232628bfd9e9c"},{"url":"https://git.kernel.org/stable/c/6c25bf4e44a2b6a14332f952bba0974521f5b72d"},{"url":"https://git.kernel.org/stable/c/bc3dd82a0ffd488bb902f4c69c3d28fd4088d973"},{"url":"https://git.kernel.org/stable/c/059ac6252a63edf1cea79bf30bd860a8c264b62c"},{"url":"https://git.kernel.org/stable/c/a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a"}],"tags":["cve.org"],"epss":0.00115,"epssPercentile":0.01532,"ingestedAt":"2026-11-06T16:57:43.216Z","slug":"CVE-2026-64244","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrivers/base/memory: set mem->altmap 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->altmap still set, causing a\nWARN_ON(mem->altmap).  This was triggered by modifying virtio-mem driver.\n\nFix this by delaying the assignment of mem->altmap until after\n__add_memory_block() has succeeded.\n\n## Affected\n\n- `Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < 802e113cf120df7208e4c7e604950a85e87120a8`\n- `Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < 22dc0d042f02ce82aa61422ea5f232628bfd9e9c`\n- `Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < 6c25bf4e44a2b6a14332f952bba0974521f5b72d`\n- `Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < bc3dd82a0ffd488bb902f4c69c3d28fd4088d973`\n- `Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < 059ac6252a63edf1cea79bf30bd860a8c264b62c`\n- `Linux >= 1a8c64e110435e44e71bcd50a75663174b575f22 < a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a`\n- `Linux 6.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}