CVE-2022-49411: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: bfq: Make sure bfqg for which we are queueing requests is online Bios queued into BFQ IO scheduler can be associated with a cgroup that was already offlined. This may then cause insertion of this bfq_group into a service tree. But this bfq_group will get freed as soon as last bio associated with it is completed leading to use after free issues for service tree users. Fix the problem by making sure we always operate on online bfq_group. If the bfq_group associated with the bio is not online, we pick the first online parent.

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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-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.12 — 5.4.198
linux	linux_kernel	5.5 — 5.10.121
linux	linux_kernel	5.11 — 5.15.46
linux	linux_kernel	5.16 — 5.17.14
linux	linux_kernel	5.18 — 5.18.3

References

Advisories & Patches

https://git.kernel.org/stable/c/075a53b78b815301f8d3dd1ee2cd99554e34f0dd https://git.kernel.org/stable/c/51f724bffa3403a5236597e6b75df7329c1ec6e9 https://git.kernel.org/stable/c/6ee0868b0c3ccead5907685fcdcdd0c08dfe4b0b https://git.kernel.org/stable/c/7781c38552e6cc54ed8e9040279561340516b881 https://git.kernel.org/stable/c/97bd6c56bdcb41079e488e31df56809e3b2ce628 https://git.kernel.org/stable/c/ccddf8cd411c1800863ed357064e56ceffd356bb

Frequently Asked Questions

What is CVE-2022-49411? +

In the Linux kernel, the following vulnerability has been resolved: bfq: Make sure bfqg for which we are queueing requests is online Bios queued into BFQ IO scheduler can be associated with a cgroup that was already offlined. This may then cause insertion of this bfq_group into a service tree. But this bfq_group will get freed as soon as last bio associated with it is completed leading to use after free issues for service tree users. Fix the problem by making sure we always operate on online bfq_group. If the bfq_group associated with the bio is not online, we pick the first online parent. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49411? +

CVE-2022-49411 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-2022-49411? +

CVE-2022-49411 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-2022-49411? +

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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