{"id":"CVE-2023-54021","state":"PUBLISHED","title":"ext4: set goal start correctly in ext4_mb_normalize_request","description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: set goal start correctly in ext4_mb_normalize_request\n\nWe need to set ac_g_ex to notify the goal start used in\next4_mb_find_by_goal. Set ac_g_ex instead of ac_f_ex in\next4_mb_normalize_request.\nBesides we should assure goal start is in range [first_data_block,\nblocks_count) as ext4_mb_initialize_context does.\n\n[ Added a check to make sure size is less than ar->pright; otherwise\n  we could end up passing an underflowed value of ar->pright - size to\n  ext4_get_group_no_and_offset(), which will trigger a BUG_ON later on.\n  - TYT ]","publishedAt":"2025-12-24T10:55:51.373Z","updatedAt":"2026-05-11T19:53:45.739Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"2479bb6cbdb4d56b807bbe5229e3e26a6f1f4530","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"390eee955d4de4662db5e3e9e9a9eae020432cb7","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"cee78217a7ae72d11c2e21e1a5263b8044489823","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"3ca3005b502ca8ea87d6a344323b179b48c4e4a3","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"bc4a3e1d07a86ae5845321d371190244acacb2f2","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"c6bee8970075b256fc1b07bf4873049219380818","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"abb330ffaa3a0ae7ce632e28c9260b461c01f19f","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"b07ffe6927c75d99af534d685282ea188d9f71a6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mballoc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.25","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.25","versionType":"semver"},{"version":"4.14.316","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.284","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.244","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.181","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.113","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.30","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.3.4","status":"unaffected","lessThanOrEqual":"6.3.*","versionType":"semver"},{"version":"6.4","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mballoc.c"]}],"references":["https://git.kernel.org/stable/c/2479bb6cbdb4d56b807bbe5229e3e26a6f1f4530","https://git.kernel.org/stable/c/390eee955d4de4662db5e3e9e9a9eae020432cb7","https://git.kernel.org/stable/c/cee78217a7ae72d11c2e21e1a5263b8044489823","https://git.kernel.org/stable/c/3ca3005b502ca8ea87d6a344323b179b48c4e4a3","https://git.kernel.org/stable/c/bc4a3e1d07a86ae5845321d371190244acacb2f2","https://git.kernel.org/stable/c/c6bee8970075b256fc1b07bf4873049219380818","https://git.kernel.org/stable/c/abb330ffaa3a0ae7ce632e28c9260b461c01f19f","https://git.kernel.org/stable/c/b07ffe6927c75d99af534d685282ea188d9f71a6"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:42.242Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/54xxx/CVE-2023-54021.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-54021","state":"PUBLISHED","datePublished":"2025-12-24T10:55:51.373Z","dateUpdated":"2026-05-11T19:53:45.739Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T10:53:46.179Z"},"containers":{"cna":{"title":"ext4: set goal start correctly in ext4_mb_normalize_request","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: set goal start correctly in ext4_mb_normalize_request\n\nWe need to set ac_g_ex to notify the goal start used in\next4_mb_find_by_goal. Set ac_g_ex instead of ac_f_ex in\next4_mb_normalize_request.\nBesides we should assure goal start is in range [first_data_block,\nblocks_count) as ext4_mb_initialize_context does.\n\n[ Added a check to make sure size is less than ar->pright; otherwise\n  we could end up passing an underflowed value of ar->pright - size to\n  ext4_get_group_no_and_offset(), which will trigger a BUG_ON later on.\n  - TYT ]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"2479bb6cbdb4d56b807bbe5229e3e26a6f1f4530","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"390eee955d4de4662db5e3e9e9a9eae020432cb7","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"cee78217a7ae72d11c2e21e1a5263b8044489823","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"3ca3005b502ca8ea87d6a344323b179b48c4e4a3","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"bc4a3e1d07a86ae5845321d371190244acacb2f2","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"c6bee8970075b256fc1b07bf4873049219380818","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"abb330ffaa3a0ae7ce632e28c9260b461c01f19f","versionType":"git"},{"version":"c9de560ded61faa5b754137b7753da252391c55a","status":"affected","lessThan":"b07ffe6927c75d99af534d685282ea188d9f71a6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mballoc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.25","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.25","versionType":"semver"},{"version":"4.14.316","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.284","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.244","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.181","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.113","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.30","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.3.4","status":"unaffected","lessThanOrEqual":"6.3.*","versionType":"semver"},{"version":"6.4","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mballoc.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/2479bb6cbdb4d56b807bbe5229e3e26a6f1f4530"},{"url":"https://git.kernel.org/stable/c/390eee955d4de4662db5e3e9e9a9eae020432cb7"},{"url":"https://git.kernel.org/stable/c/cee78217a7ae72d11c2e21e1a5263b8044489823"},{"url":"https://git.kernel.org/stable/c/3ca3005b502ca8ea87d6a344323b179b48c4e4a3"},{"url":"https://git.kernel.org/stable/c/bc4a3e1d07a86ae5845321d371190244acacb2f2"},{"url":"https://git.kernel.org/stable/c/c6bee8970075b256fc1b07bf4873049219380818"},{"url":"https://git.kernel.org/stable/c/abb330ffaa3a0ae7ce632e28c9260b461c01f19f"},{"url":"https://git.kernel.org/stable/c/b07ffe6927c75d99af534d685282ea188d9f71a6"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:53:45.739Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"4.14.316"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"4.19.284"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"5.4.244"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"5.10.181"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"5.15.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.1.30"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.3.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.4"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}