CVE-2024-26775: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: aoe: avoid potential deadlock at set_capacity Move set_capacity() outside of the section procected by (&d->lock). To avoid possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- [1] lock(&bdev->bd_size_lock); local_irq_disable(); [2] lock(&d->lock); [3] lock(&bdev->bd_size_lock); <Interrupt> [4] lock(&d->lock); *** DEADLOCK *** Where [1](&bdev->bd_size_lock) hold by zram_add()->set_capacity(). [2]lock(&d->lock) hold by aoeblk_gdalloc(). And aoeblk_gdalloc() is trying to acquire [3](&bdev->bd_size_lock) at set_capacity() call. In this situation an attempt to acquire [4]lock(&d->lock) from aoecmd_cfg_rsp() will lead to deadlock. So the simplest solution is breaking lock dependency [2](&d->lock) -> [3](&bdev->bd_size_lock) by moving set_capacity() outside.

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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

Weakness Type (CWE)

CWE-667 CWE-667

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 6.1.80
linux	linux_kernel	6.2 — 6.6.19
linux	linux_kernel	6.7 — 6.7.7
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/19a77b27163820f793b4d022979ffdca8f659b77 https://git.kernel.org/stable/c/2d623c94fbba3554f4446ba6f3c764994e8b0d26 https://git.kernel.org/stable/c/673629018ba04906899dcb631beec34d871f709c https://git.kernel.org/stable/c/e169bd4fb2b36c4b2bee63c35c740c85daeb2e86 https://git.kernel.org/stable/c/19a77b27163820f793b4d022979ffdca8f659b77 https://git.kernel.org/stable/c/2d623c94fbba3554f4446ba6f3c764994e8b0d26 https://git.kernel.org/stable/c/673629018ba04906899dcb631beec34d871f709c https://git.kernel.org/stable/c/e169bd4fb2b36c4b2bee63c35c740c85daeb2e86

Other References

https://git.kernel.org/stable/c/2499fa286fb010ceb289950050199f33c26667b9

Frequently Asked Questions

What is CVE-2024-26775? +

In the Linux kernel, the following vulnerability has been resolved: aoe: avoid potential deadlock at set_capacity Move set_capacity() outside of the section procected by (&d->lock). To avoid possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- [1] lock(&bdev->bd_size_lock); local_irq_disable(); [2] lock(&d->lock); [3] lock(&bdev->bd_size_lock); <Interrupt> [4] lock(&d->lock); *** DEADLOCK *** Where [1](&bdev->bd_size_lock) hold by zram_add()->set_capacity(). [2]lock(&d->lock) hold by aoeblk_gdalloc(). And aoeblk_gdalloc() is trying to acquire [3](&bdev->bd_size_lock) at set_capacity() call. In this situation an attempt to acquire [4]lock(&d->lock) from aoecmd_cfg_rsp() will lead to deadlock. So the simplest solution is breaking lock dependency [2](&d->lock) -> [3](&bdev->bd_size_lock) by moving set_capacity() outside. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-26775? +

CVE-2024-26775 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-2024-26775? +

CVE-2024-26775 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-26775? +

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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