CVE-2023-52855

MEDIUM
Published May 21, 2024 Modified Apr 2, 2025 CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: usb: dwc2: fix possible NULL pointer dereference caused by driver concurrency In _dwc2_hcd_urb_enqueue(), "urb->hcpriv = NULL" is executed without holding the lock "hsotg->lock". In _dwc2_hcd_urb_dequeue(): spin_lock_irqsave(&hsotg->lock, flags); ... if (!urb->hcpriv) { dev_dbg(hsotg->dev, "## urb->hcpriv is NULL ##\n"); goto out; } rc = dwc2_hcd_urb_dequeue(hsotg, urb->hcpriv); // Use urb->hcpriv ... out: spin_unlock_irqrestore(&hsotg->lock, flags); When _dwc2_hcd_urb_enqueue() and _dwc2_hcd_urb_dequeue() are concurrently executed, the NULL check of "urb->hcpriv" can be executed before "urb->hcpriv = NULL". After urb->hcpriv is NULL, it can be used in the function call to dwc2_hcd_urb_dequeue(), which can cause a NULL pointer dereference. This possible bug is found by an experimental static analysis tool developed by myself. This tool analyzes the locking APIs to extract function pairs that can be concurrently executed, and then analyzes the instructions in the paired functions to identify possible concurrency bugs including data races and atomicity violations. The above possible bug is reported, when my tool analyzes the source code of Linux 6.5. To fix this possible bug, "urb->hcpriv = NULL" should be executed with holding the lock "hsotg->lock". After using this patch, my tool never reports the possible bug, with the kernelconfiguration allyesconfig for x86_64. Because I have no associated hardware, I cannot test the patch in runtime testing, and just verify it according to the code logic.

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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-476 CWE-476

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

References

Advisories & Patches

https://git.kernel.org/stable/c/14c9ec34e8118fbffd7f5431814d767726323e72 https://git.kernel.org/stable/c/3e851a77a13ce944d703721793f49ee82622986d https://git.kernel.org/stable/c/64c47749fc7507ed732e155c958253968c1d275e https://git.kernel.org/stable/c/6b21a22728852d020a6658d39cd7bb7e14b07790 https://git.kernel.org/stable/c/a7bee9598afb38004841a41dd8fe68c1faff4e90 https://git.kernel.org/stable/c/bdb3dd4096302d6b87441fdc528439f171b04be6 https://git.kernel.org/stable/c/ef307bc6ef04e8c1ea843231db58e3afaafa9fa6 https://git.kernel.org/stable/c/fcaafb574fc88a52dce817f039f7ff2f9da38001 https://git.kernel.org/stable/c/fed492aa6493a91a77ebd51da6fb939c98d94a0d https://git.kernel.org/stable/c/14c9ec34e8118fbffd7f5431814d767726323e72 https://git.kernel.org/stable/c/3e851a77a13ce944d703721793f49ee82622986d https://git.kernel.org/stable/c/64c47749fc7507ed732e155c958253968c1d275e https://git.kernel.org/stable/c/6b21a22728852d020a6658d39cd7bb7e14b07790 https://git.kernel.org/stable/c/a7bee9598afb38004841a41dd8fe68c1faff4e90 https://git.kernel.org/stable/c/bdb3dd4096302d6b87441fdc528439f171b04be6 https://git.kernel.org/stable/c/ef307bc6ef04e8c1ea843231db58e3afaafa9fa6 https://git.kernel.org/stable/c/fcaafb574fc88a52dce817f039f7ff2f9da38001 https://git.kernel.org/stable/c/fed492aa6493a91a77ebd51da6fb939c98d94a0d

Frequently Asked Questions

What is CVE-2023-52855? +
In the Linux kernel, the following vulnerability has been resolved: usb: dwc2: fix possible NULL pointer dereference caused by driver concurrency In _dwc2_hcd_urb_enqueue(), "urb->hcpriv = NULL" is executed without holding the lock "hsotg->lock". In _dwc2_hcd_urb_dequeue(): spin_lock_irqsave(&hsotg->lock, flags); ... if (!urb->hcpriv) { dev_dbg(hsotg->dev, "## urb->hcpriv is NULL ##\n"); goto out; } rc = dwc2_hcd_urb_dequeue(hsotg, urb->hcpriv); // Use urb->hcpriv ... out: spin_unlock_irqrestore(&hsotg->lock, flags); When _dwc2_hcd_urb_enqueue() and _dwc2_hcd_urb_dequeue() are concurrently executed, the NULL check of "urb->hcpriv" can be executed before "urb->hcpriv = NULL". After urb->hcpriv is NULL, it can be used in the function call to dwc2_hcd_urb_dequeue(), which can cause a NULL pointer dereference. This possible bug is found by an experimental static analysis tool developed by myself. This tool analyzes the locking APIs to extract function pairs that can be concurrently executed, and then analyzes the instructions in the paired functions to identify possible concurrency bugs including data races and atomicity violations. The above possible bug is reported, when my tool analyzes the source code of Linux 6.5. To fix this possible bug, "urb->hcpriv = NULL" should be executed with holding the lock "hsotg->lock". After using this patch, my tool never reports the possible bug, with the kernelconfiguration allyesconfig for x86_64. Because I have no associated hardware, I cannot test the patch in runtime testing, and just verify it according to the code logic. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2023-52855? +
CVE-2023-52855 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-2023-52855? +
CVE-2023-52855 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-2023-52855? +
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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