{"id":"CVE-2024-26773","summary":"ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()","details":"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-\u003eac_sb, group)\n    ext4_mb_use_best_found\n      mb_mark_used\n      // Allocating blocks in block bitmap corrupted group","modified":"2026-04-02T10:05:55.395105Z","published":"2024-04-03T17:00:59.757Z","related":["ALSA-2024:4928","SUSE-SU-2024:1641-1","SUSE-SU-2024:1643-1","SUSE-SU-2024:1644-1","SUSE-SU-2024:1646-1","SUSE-SU-2024:1647-1","SUSE-SU-2024:1659-1","SUSE-SU-2024:1663-1","SUSE-SU-2024:1870-1","SUSE-SU-2024:2135-1","SUSE-SU-2024:2203-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26773.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea"},{"type":"WEB","url":"https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26773.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26773"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"163a203ddb36c36d4a1c942aececda0cc8d06aa7"},{"fixed":"21f8cfe79f776287459343e9cfa6055af61328ea"},{"fixed":"260fc96283c0f594de18a1b045faf6d8fb42874d"},{"fixed":"927794a02169778c9c2e7b25c768ab3ea8c1dc03"},{"fixed":"4c21fa60a6f4606f6214a38f50612b17b2f738f5"},{"fixed":"f97e75fa4e12b0aa0224e83fcbda8853ac2adf36"},{"fixed":"0184747b552d6b5a14db3b7fcc3b792ce64dedd1"},{"fixed":"a2576ae9a35c078e488f2c573e9e6821d651fbbe"},{"fixed":"4530b3660d396a646aad91a787b6ab37cf604b53"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26773.json"}}],"schema_version":"1.7.5"}