{"id":"CVE-2022-49147","state":"PUBLISHED","title":"block: Fix the maximum minor value is blk_alloc_ext_minor()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: Fix the maximum minor value is blk_alloc_ext_minor()\n\nida_alloc_range(..., min, max, ...) returns values from min to max,\ninclusive.\n\nSo, NR_EXT_DEVT is a valid idx returned by blk_alloc_ext_minor().\n\nThis is an issue because in device_add_disk(), this value is used in:\n   ddev->devt = MKDEV(disk->major, disk->first_minor);\nand NR_EXT_DEVT is '(1 << MINORBITS)'.\n\nSo, should 'disk->first_minor' be NR_EXT_DEVT, it would overflow.","publishedAt":"2025-02-26T01:55:15.373Z","updatedAt":"2026-05-11T18:54:02.788Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"22ae8ce8b89241c94ac00c237752c0ffa37ba5ae","status":"affected","lessThan":"5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb","versionType":"git"},{"version":"22ae8ce8b89241c94ac00c237752c0ffa37ba5ae","status":"affected","lessThan":"0f8cf8f5ccbad25ed6828875b222dbab29d5c272","versionType":"git"},{"version":"22ae8ce8b89241c94ac00c237752c0ffa37ba5ae","status":"affected","lessThan":"fbe2cc4525480ddd20c866bb5c0578071e01451a","versionType":"git"},{"version":"22ae8ce8b89241c94ac00c237752c0ffa37ba5ae","status":"affected","lessThan":"d1868328dec5ae2cf210111025fcbc71f78dd5ca","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/genhd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.33","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16.19","status":"unaffected","lessThanOrEqual":"5.16.*","versionType":"semver"},{"version":"5.17.2","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/genhd.c"]}],"references":["https://git.kernel.org/stable/c/5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb","https://git.kernel.org/stable/c/0f8cf8f5ccbad25ed6828875b222dbab29d5c272","https://git.kernel.org/stable/c/fbe2cc4525480ddd20c866bb5c0578071e01451a","https://git.kernel.org/stable/c/d1868328dec5ae2cf210111025fcbc71f78dd5ca"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49147.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49147","state":"PUBLISHED","datePublished":"2025-02-26T01:55:15.373Z","dateUpdated":"2026-05-11T18:54:02.788Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-02-26T01:49:39.271Z"},"containers":{"cna":{"title":"block: Fix the maximum minor value is blk_alloc_ext_minor()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: Fix the maximum minor value is blk_alloc_ext_minor()\n\nida_alloc_range(..., min, max, ...) returns values from min to max,\ninclusive.\n\nSo, NR_EXT_DEVT is a valid idx returned by blk_alloc_ext_minor().\n\nThis is an issue because in device_add_disk(), this value is used in:\n   ddev->devt = MKDEV(disk->major, disk->first_minor);\nand NR_EXT_DEVT is '(1 << MINORBITS)'.\n\nSo, should 'disk->first_minor' be NR_EXT_DEVT, it would overflow."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"22ae8ce8b89241c94ac00c237752c0ffa37ba5ae","status":"affected","lessThan":"5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb","versionType":"git"},{"version":"22ae8ce8b89241c94ac00c237752c0ffa37ba5ae","status":"affected","lessThan":"0f8cf8f5ccbad25ed6828875b222dbab29d5c272","versionType":"git"},{"version":"22ae8ce8b89241c94ac00c237752c0ffa37ba5ae","status":"affected","lessThan":"fbe2cc4525480ddd20c866bb5c0578071e01451a","versionType":"git"},{"version":"22ae8ce8b89241c94ac00c237752c0ffa37ba5ae","status":"affected","lessThan":"d1868328dec5ae2cf210111025fcbc71f78dd5ca","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/genhd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.33","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16.19","status":"unaffected","lessThanOrEqual":"5.16.*","versionType":"semver"},{"version":"5.17.2","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/genhd.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb"},{"url":"https://git.kernel.org/stable/c/0f8cf8f5ccbad25ed6828875b222dbab29d5c272"},{"url":"https://git.kernel.org/stable/c/fbe2cc4525480ddd20c866bb5c0578071e01451a"},{"url":"https://git.kernel.org/stable/c/d1868328dec5ae2cf210111025fcbc71f78dd5ca"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T18:54:02.788Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.16.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.17.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}