{"id":"CVE-2026-64244","state":"PUBLISHED","title":"drivers/base/memory: set mem->altmap after successful device registration","description":"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_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.","publishedAt":"2026-07-24T15:29:59.891Z","updatedAt":"2026-08-17T04:51:55.230Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"802e113cf120df7208e4c7e604950a85e87120a8","versionType":"git"},{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"22dc0d042f02ce82aa61422ea5f232628bfd9e9c","versionType":"git"},{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"6c25bf4e44a2b6a14332f952bba0974521f5b72d","versionType":"git"},{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"bc3dd82a0ffd488bb902f4c69c3d28fd4088d973","versionType":"git"},{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"059ac6252a63edf1cea79bf30bd860a8c264b62c","versionType":"git"},{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/memory.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.6.144","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.95","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.37","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.14","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1.2","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/memory.c"]}],"references":["https://git.kernel.org/stable/c/802e113cf120df7208e4c7e604950a85e87120a8","https://git.kernel.org/stable/c/22dc0d042f02ce82aa61422ea5f232628bfd9e9c","https://git.kernel.org/stable/c/6c25bf4e44a2b6a14332f952bba0974521f5b72d","https://git.kernel.org/stable/c/bc3dd82a0ffd488bb902f4c69c3d28fd4088d973","https://git.kernel.org/stable/c/059ac6252a63edf1cea79bf30bd860a8c264b62c","https://git.kernel.org/stable/c/a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64244.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64244","state":"PUBLISHED","datePublished":"2026-07-24T15:29:59.891Z","dateUpdated":"2026-08-17T04:51:55.230Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.772Z"},"containers":{"cna":{"title":"drivers/base/memory: set mem->altmap after successful device registration","descriptions":[{"lang":"en","value":"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_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"802e113cf120df7208e4c7e604950a85e87120a8","versionType":"git"},{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"22dc0d042f02ce82aa61422ea5f232628bfd9e9c","versionType":"git"},{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"6c25bf4e44a2b6a14332f952bba0974521f5b72d","versionType":"git"},{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"bc3dd82a0ffd488bb902f4c69c3d28fd4088d973","versionType":"git"},{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"059ac6252a63edf1cea79bf30bd860a8c264b62c","versionType":"git"},{"version":"1a8c64e110435e44e71bcd50a75663174b575f22","status":"affected","lessThan":"a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/memory.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.6.144","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.95","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.37","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.14","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1.2","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/memory.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:51:55.230Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.6.144"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.12.95"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.37"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.0.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.1.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}