ghsa-j648-rgv6-ccc8
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()
Determine if the group block bitmap is corrupted before using ac_b_ex in ext4_mb_try_best_found() to avoid allocating blocks from a group with a corrupted block bitmap in the following concurrency and making the situation worse.
ext4_mb_regular_allocator ext4_lock_group(sb, group) ext4_mb_good_group // check if the group bbitmap is corrupted ext4_mb_complex_scan_group // Scan group gets ac_b_ex but doesn't use it ext4_unlock_group(sb, group) ext4_mark_group_bitmap_corrupted(group) // The block bitmap was corrupted during // the group unlock gap. ext4_mb_try_best_found ext4_lock_group(ac->ac_sb, group) ext4_mb_use_best_found mb_mark_used // Allocating blocks in block bitmap corrupted group
{
"affected": [],
"aliases": [
"CVE-2024-26773"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-04-03T17:15:53Z",
"severity": null
},
"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\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",
"id": "GHSA-j648-rgv6-ccc8",
"modified": "2024-06-27T15:30:38Z",
"published": "2024-04-03T18:30:43Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26773"
},
{
"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"
}
],
"schema_version": "1.4.0",
"severity": []
}