{"api_version":"1","generated_at":"2026-07-25T01:15:36+00:00","cve":"CVE-2026-64244","urls":{"html":"https://cve.report/CVE-2026-64244","api":"https://cve.report/api/cve/CVE-2026-64244.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64244","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64244"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-24 16:16:53","updated_at":"2026-07-24 16:16:53"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/6c25bf4e44a2b6a14332f952bba0974521f5b72d","name":"https://git.kernel.org/stable/c/6c25bf4e44a2b6a14332f952bba0974521f5b72d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a","name":"https://git.kernel.org/stable/c/a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/802e113cf120df7208e4c7e604950a85e87120a8","name":"https://git.kernel.org/stable/c/802e113cf120df7208e4c7e604950a85e87120a8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bc3dd82a0ffd488bb902f4c69c3d28fd4088d973","name":"https://git.kernel.org/stable/c/bc3dd82a0ffd488bb902f4c69c3d28fd4088d973","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/22dc0d042f02ce82aa61422ea5f232628bfd9e9c","name":"https://git.kernel.org/stable/c/22dc0d042f02ce82aa61422ea5f232628bfd9e9c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/059ac6252a63edf1cea79bf30bd860a8c264b62c","name":"https://git.kernel.org/stable/c/059ac6252a63edf1cea79bf30bd860a8c264b62c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64244","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64244","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1a8c64e110435e44e71bcd50a75663174b575f22 802e113cf120df7208e4c7e604950a85e87120a8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1a8c64e110435e44e71bcd50a75663174b575f22 22dc0d042f02ce82aa61422ea5f232628bfd9e9c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1a8c64e110435e44e71bcd50a75663174b575f22 6c25bf4e44a2b6a14332f952bba0974521f5b72d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1a8c64e110435e44e71bcd50a75663174b575f22 bc3dd82a0ffd488bb902f4c69c3d28fd4088d973 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1a8c64e110435e44e71bcd50a75663174b575f22 059ac6252a63edf1cea79bf30bd860a8c264b62c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1a8c64e110435e44e71bcd50a75663174b575f22 a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.144 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.95 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.37 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.14 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.2 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/base/memory.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"802e113cf120df7208e4c7e604950a85e87120a8","status":"affected","version":"1a8c64e110435e44e71bcd50a75663174b575f22","versionType":"git"},{"lessThan":"22dc0d042f02ce82aa61422ea5f232628bfd9e9c","status":"affected","version":"1a8c64e110435e44e71bcd50a75663174b575f22","versionType":"git"},{"lessThan":"6c25bf4e44a2b6a14332f952bba0974521f5b72d","status":"affected","version":"1a8c64e110435e44e71bcd50a75663174b575f22","versionType":"git"},{"lessThan":"bc3dd82a0ffd488bb902f4c69c3d28fd4088d973","status":"affected","version":"1a8c64e110435e44e71bcd50a75663174b575f22","versionType":"git"},{"lessThan":"059ac6252a63edf1cea79bf30bd860a8c264b62c","status":"affected","version":"1a8c64e110435e44e71bcd50a75663174b575f22","versionType":"git"},{"lessThan":"a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a","status":"affected","version":"1a8c64e110435e44e71bcd50a75663174b575f22","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/base/memory.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.6"},{"lessThan":"6.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.144","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.95","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.37","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.14","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.2","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.144","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.95","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.37","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.14","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.2","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"6.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-07-24T15:29:59.891Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"drivers/base/memory: set mem->altmap after successful device registration","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64244","datePublished":"2026-07-24T15:29:59.891Z","dateReserved":"2026-07-19T15:36:31.772Z","dateUpdated":"2026-07-24T15:29:59.891Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-24 16:16:53","lastModifiedDate":"2026-07-24 16:16:53","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64244","Ordinal":"1","Title":"drivers/base/memory: set mem->altmap after successful device reg","CVE":"CVE-2026-64244","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64244","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"drivers/base/memory: set mem->altmap after successful device reg"}]}}}