CVE-2022-50470: linux kernel Double Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: xhci: Remove device endpoints from bandwidth list when freeing the device Endpoints are normally deleted from the bandwidth list when they are dropped, before the virt device is freed. If xHC host is dying or being removed then the endpoints aren't dropped cleanly due to functions returning early to avoid interacting with a non-accessible host controller. So check and delete endpoints that are still on the bandwidth list when freeing the virt device. Solves a list_del corruption kernel crash when unbinding xhci-pci, caused by xhci_mem_cleanup() when it later tried to delete already freed endpoints from the bandwidth list. This only affects hosts that use software bandwidth checking, which currenty is only the xHC in intel Panther Point PCH (Ivy Bridge)

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CVSS v3.1 Score

7.8

HIGH

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

Weakness Type (CWE)

CWE-415 CWE-415

Affected Products

Vendor	Product	Versions
linux	linux_kernel	3.2 — 4.9.332
linux	linux_kernel	4.10 — 4.14.298
linux	linux_kernel	4.15 — 4.19.264
linux	linux_kernel	4.20 — 5.4.223
linux	linux_kernel	5.5 — 5.10.153
linux	linux_kernel	5.11 — 5.15.77
linux	linux_kernel	5.16 — 6.0.7
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/3bf860a41e0f2fcea0ac3aae8f7ef887a7994b70 https://git.kernel.org/stable/c/5aed5b7c2430ce318a8e62f752f181e66f0d1053 https://git.kernel.org/stable/c/5e4ce28ad907aa54f13b21d5f1dc490525957b0c https://git.kernel.org/stable/c/678d2cc2041cc6ce05030852dce9ad42719abcfc https://git.kernel.org/stable/c/8f1cd9633d1f21efc13e8fc75be8f2b6bb85e38c https://git.kernel.org/stable/c/c892a81c7424b4f6a660cb9c249d354ccf3afeca https://git.kernel.org/stable/c/cebbc8d335d6bcc1316584f779c08f80287c6af8 https://git.kernel.org/stable/c/f0de39474078adef6ece7a183e34c15ce2c1d8d1

Frequently Asked Questions

What is CVE-2022-50470? +

In the Linux kernel, the following vulnerability has been resolved: xhci: Remove device endpoints from bandwidth list when freeing the device Endpoints are normally deleted from the bandwidth list when they are dropped, before the virt device is freed. If xHC host is dying or being removed then the endpoints aren't dropped cleanly due to functions returning early to avoid interacting with a non-accessible host controller. So check and delete endpoints that are still on the bandwidth list when freeing the virt device. Solves a list_del corruption kernel crash when unbinding xhci-pci, caused by xhci_mem_cleanup() when it later tried to delete already freed endpoints from the bandwidth list. This only affects hosts that use software bandwidth checking, which currenty is only the xHC in intel Panther Point PCH (Ivy Bridge) It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-50470? +

CVE-2022-50470 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-50470? +

CVE-2022-50470 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-2022-50470? +

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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