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Tracker / CVE-2024-26773

CVE-2024-26773

High 7.8

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 and versions

debian debian_linux
linux linux_kernel
linux linux_kernel · … → 4.19.308
linux linux_kernel · 4.20 → 5.4.270
linux linux_kernel · 5.11 → 5.15.150
linux linux_kernel · 5.16 → 6.1.80
linux linux_kernel · 5.5 → 5.10.211
linux linux_kernel · 6.2 → 6.6.19
linux linux_kernel · 6.7 → 6.7.7

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References