cve-2024-26773
Vulnerability from cvelistv5
Published
2024-04-03 17:00
Modified
2024-08-02 00:14
Severity
Summary
ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website


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          "value": "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\u0027t 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"
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    "dateReserved": "2024-02-19T14:20:24.176Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26773\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-03T17:15:53.080\",\"lastModified\":\"2024-06-27T13:15:56.330\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027t 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\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ext4: evite asignar bloques de un grupo da\u00f1ado en ext4_mb_try_best_found() Determine si el mapa de bits del bloque del grupo est\u00e1 da\u00f1ado antes de usar ac_b_ex en ext4_mb_try_best_found() para evitar asignar bloques de un grupo con un bloque da\u00f1ado mapa de bits en la siguiente concurrencia y empeorando la situaci\u00f3n. ext4_mb_regular_allocator ext4_lock_group(sb, group) ext4_mb_good_group // verifica si el bbitmap del grupo est\u00e1 da\u00f1ado ext4_mb_complex_scan_group // El grupo de escaneo obtiene ac_b_ex pero no lo usa ext4_unlock_group(sb, group) ext4_mark_group_bitmap_corrupted(group) // El mapa de bits del bloque se corrompi\u00f3 durante // el grupo desbloquea la brecha. ext4_mb_try_best_found ext4_lock_group(ac-\u0026gt;ac_sb, group) ext4_mb_use_best_found mb_mark_used // Asignaci\u00f3n de bloques en un grupo da\u00f1ado de mapa de bits de bloques\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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