CVE-2024-36896: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix access violation during port device removal Testing with KASAN and syzkaller revealed a bug in port.c:disable_store(): usb_hub_to_struct_hub() can return NULL if the hub that the port belongs to is concurrently removed, but the function does not check for this possibility before dereferencing the returned value. It turns out that the first dereference is unnecessary, since hub->intfdev is the parent of the port device, so it can be changed easily. Adding a check for hub == NULL prevents further problems. The same bug exists in the disable_show() routine, and it can be fixed the same way.

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CVSS v3.1 Score

9.1

CRITICAL

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

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	6.0 — 6.1.91
linux	linux_kernel	6.2 — 6.6.31
linux	linux_kernel	6.7 — 6.8.10
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/5f1d68ef5ddac27c6b997adccd1c339cef1e6848 https://git.kernel.org/stable/c/6119ef6517ce501fc548154691abdaf1f954a277 https://git.kernel.org/stable/c/63533549ff53d24daf47c443dbd43c308afc3434 https://git.kernel.org/stable/c/a4b46d450c49f32e9d4247b421e58083fde304ce https://git.kernel.org/stable/c/5f1d68ef5ddac27c6b997adccd1c339cef1e6848 https://git.kernel.org/stable/c/6119ef6517ce501fc548154691abdaf1f954a277 https://git.kernel.org/stable/c/63533549ff53d24daf47c443dbd43c308afc3434 https://git.kernel.org/stable/c/a4b46d450c49f32e9d4247b421e58083fde304ce

Frequently Asked Questions

What is CVE-2024-36896? +

In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix access violation during port device removal Testing with KASAN and syzkaller revealed a bug in port.c:disable_store(): usb_hub_to_struct_hub() can return NULL if the hub that the port belongs to is concurrently removed, but the function does not check for this possibility before dereferencing the returned value. It turns out that the first dereference is unnecessary, since hub->intfdev is the parent of the port device, so it can be changed easily. Adding a check for hub == NULL prevents further problems. The same bug exists in the disable_show() routine, and it can be fixed the same way. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2024-36896? +

CVE-2024-36896 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2024-36896? +

CVE-2024-36896 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-2024-36896? +

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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