CVE-2024-26773: ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()
First published: Wed Apr 03 2024(Updated: )
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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.19.308 | 4.19.308 |
| redhat/kernel | <5.4.270 | 5.4.270 |
| redhat/kernel | <5.10.211 | 5.10.211 |
| redhat/kernel | <5.15.150 | 5.15.150 |
| redhat/kernel | <6.1.80 | 6.1.80 |
| redhat/kernel | <6.6.19 | 6.6.19 |
| redhat/kernel | <6.7.7 | 6.7.7 |
| redhat/kernel | <6.8 | 6.8 |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.17-1 |
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Reference Links
- 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://launchpad.net/bugs/cve/CVE-2024-26773
- https://access.redhat.com/security/cve/CVE-2024-26773
- https://lore.kernel.org/linux-cve-announce/2024040308-CVE-2024-26773-a314@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2273237
- https://access.redhat.com/errata/RHSA-2024:4823
- https://access.redhat.com/errata/RHSA-2024:4831
- https://access.redhat.com/errata/RHSA-2024:4928
- https://access.redhat.com/errata/RHSA-2024:5102
- https://access.redhat.com/errata/RHSA-2024:5101
- https://access.redhat.com/errata/RHSA-2024:5255
- https://access.redhat.com/errata/RHSA-2024:6753
- https://bugzilla.redhat.com/show_bug.cgi?id=2273236
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26773
- https://nvd.nist.gov/vuln/detail/CVE-2024-26773
- https://security-tracker.debian.org/tracker/CVE-2024-26773
- https://ubuntu.com/security/CVE-2024-26773
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- https://git.kernel.org/linus/4530b3660d396a646aad91a787b6ab37cf604b53
Frequently Asked Questions
What is the severity of CVE-2024-26773?
CVE-2024-26773 has been classified as having a moderate severity level.
How do I fix CVE-2024-26773?
To fix CVE-2024-26773, you should update the kernel to the latest patched version as specified by your distribution.
Which Linux kernel versions are affected by CVE-2024-26773?
CVE-2024-26773 affects multiple Linux kernel versions prior to 4.19.308, 5.4.270, 5.10.211, 5.15.150, 6.1.80, and newer versions specified by vendors.
Is there a known exploit for CVE-2024-26773?
As of now, there are no publicly available exploits specifically targeting CVE-2024-26773.
What systems are vulnerable to CVE-2024-26773?
Systems running versions of the Linux kernel prior to the remediation updates are vulnerable to CVE-2024-26773.
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