cve/2024/CVE-2024-26773.md

### [CVE-2024-26773](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26773)
![](https://img.shields.io/static/v1?label=Product&message=Linux&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=blue)

### Description

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 inext4_mb_try_best_found() to avoid allocating blocks from a group with acorrupted block bitmap in the following concurrency and making thesituation 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

### POC

#### Reference
- https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d

#### Github
No PoCs found on GitHub currently.