CVE-2024-26773: Debian Linux

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Debian Debian Linux: version 10.0 only
• Linux Linux Kernel: before 4.19.308 (fixed in 4.19.308); from 4.20, before 5.4.270 (fixed in 5.4.270); from 5.5, before 5.10.211 (fixed in 5.10.211); from 5.11, before 5.15.150 (fixed in 5.15.150); from 5.16, before 6.1.80 (fixed in 6.1.80); from 6.2, before 6.6.19 (fixed in 6.6.19); …

Published 2024-04-03. Last modified 2026-08-04.