{"id":"CVE-2024-26773","title":"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_bes…","summary":"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_bes…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel < 4.19.308","linux_kernel >= 4.20, < 5.4.270","linux_kernel >= 5.5, < 5.10.211","linux_kernel >= 5.11, < 5.15.150","linux_kernel >= 5.16, < 6.1.80","linux_kernel >= 6.2, < 6.6.19","linux_kernel >= 6.7, < 6.7.7","linux_kernel = 6.8","debian_linux = 10.0"],"patched":["linux_kernel 6.7.7"],"published":"2024-04-03","updated":"2026-08-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2024-26773","references":[{"url":"https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00312,"epssPercentile":0.24185,"ingestedAt":"2026-08-05T10:46:48.851Z","slug":"CVE-2024-26773","body":"## Overview\n\nIn 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\n\n## Affected\n\n- `linux_kernel < 4.19.308`\n- `linux_kernel >= 4.20, < 5.4.270`\n- `linux_kernel >= 5.5, < 5.10.211`\n- `linux_kernel >= 5.11, < 5.15.150`\n- `linux_kernel >= 5.16, < 6.1.80`\n- `linux_kernel >= 6.2, < 6.6.19`\n- `linux_kernel >= 6.7, < 6.7.7`\n- `linux_kernel = 6.8`\n- `debian_linux = 10.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.7.7`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}