CVE-2024-26773

MEDIUM
Published Apr 3, 2024 Modified Mar 18, 2025

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 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

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
debian debian_linux

References

Advisories & Patches

https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1 https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53 https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5 https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03 https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36 https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1 https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53 https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5 https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03 https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36

Frequently Asked Questions

What is CVE-2024-26773? +
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 It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2024-26773? +
CVE-2024-26773 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2024-26773? +
CVE-2024-26773 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-26773? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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