{"id":"CVE-2024-26773","revision":null,"records":[{"revision":"892ed67eb78642478d42305a6f0320b0","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-26773","aliases":[],"title":"ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()\n\nDetermine if the group block bitmap is corrupted before using ac_b_ex in\next4_mb_try_best_found() to avoid allocating blocks from a group with a\ncorrupted block bitmap in the following concurrency and making the\nsituation worse.\n\next4_mb_regular_allocator\n ext4_lock_group(sb, group)\n ext4_mb_good_group\n // check if the group bbitmap is corrupted\n ext4_mb_complex_scan_group\n // Scan group gets ac_b_ex but doesn't use it\n ext4_unlock_group(sb, group)\n ext4_mark_group_bitmap_corrupted(group)\n // The block bitmap was corrupted during\n // the group unlock gap.\n ext4_mb_try_best_found\n ext4_lock_group(ac->ac_sb, group)\n ext4_mb_use_best_found\n mb_mark_used\n // Allocating blocks in block bitmap corrupted group","state":0,"publishedAt":"2024-04-03T17:00:59.757+00:00","modifiedAt":"2026-10-15T00:38:30.96+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/ext4/mballoc.c\"\n ],\n \"versions\": [\n {\n \"version\": \"163a203ddb36c36d4a1c942aececda0cc8d06aa7\",\n \"lessThan\": \"21f8cfe79f776287459343e9cfa6055af61328ea\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"163a203ddb36c36d4a1c942aececda0cc8d06aa7\",\n \"lessThan\": \"260fc96283c0f594de18a1b045faf6d8fb42874d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"163a203ddb36c36d4a1c942aececda0cc8d06aa7\",\n \"lessThan\": \"927794a02169778c9c2e7b25c768ab3ea8c1dc03\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"163a203ddb36c36d4a1c942aececda0cc8d06aa7\",\n \"lessThan\": \"4c21fa60a6f4606f6214a38f50612b17b2f738f5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"163a203ddb36c36d4a1c942aececda0cc8d06aa7\",\n \"lessThan\": \"f97e75fa4e12b0aa0224e83fcbda8853ac2adf36\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"163a203ddb36c36d4a1c942aececda0cc8d06aa7\",\n \"lessThan\": \"0184747b552d6b5a14db3b7fcc3b792ce64dedd1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"163a203ddb36c36d4a1c942aececda0cc8d06aa7\",\n \"lessThan\": \"a2576ae9a35c078e488f2c573e9e6821d651fbbe\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"163a203ddb36c36d4a1c942aececda0cc8d06aa7\",\n \"lessThan\": \"4530b3660d396a646aad91a787b6ab37cf604b53\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/ext4/mballoc.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.12\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.12\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.19.308\",\n \"lessThanOrEqual\": \"4.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.270\",\n \"lessThanOrEqual\": \"5.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.211\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.150\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.80\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.19\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.7.7\",\n \"lessThanOrEqual\": \"6.7.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.8\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea","https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d","https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03","https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5","https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36","https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1","https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe","https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-26773","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-26773","identifiers":["CVE-2024-26773"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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