CVE-2021-47378: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: nvme-rdma: destroy cm id before destroy qp to avoid use after free We should always destroy cm_id before destroy qp to avoid to get cma event after qp was destroyed, which may lead to use after free. In RDMA connection establishment error flow, don't destroy qp in cm event handler.Just report cm_error to upper level, qp will be destroy in nvme_rdma_alloc_queue() after destroy cm id.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/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	< 5.10.70
linux	linux_kernel	5.11 — 5.14.9
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/9817d763dbe15327b9b3ff4404fa6f27f927e744 https://git.kernel.org/stable/c/d268a182c56e8361e19fb781137411643312b994 https://git.kernel.org/stable/c/ecf0dc5a904830c926a64feffd8e01141f89822f https://git.kernel.org/stable/c/9817d763dbe15327b9b3ff4404fa6f27f927e744 https://git.kernel.org/stable/c/d268a182c56e8361e19fb781137411643312b994 https://git.kernel.org/stable/c/ecf0dc5a904830c926a64feffd8e01141f89822f

Frequently Asked Questions

What is CVE-2021-47378? +

In the Linux kernel, the following vulnerability has been resolved: nvme-rdma: destroy cm id before destroy qp to avoid use after free We should always destroy cm_id before destroy qp to avoid to get cma event after qp was destroyed, which may lead to use after free. In RDMA connection establishment error flow, don't destroy qp in cm event handler.Just report cm_error to upper level, qp will be destroy in nvme_rdma_alloc_queue() after destroy cm id. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2021-47378? +

CVE-2021-47378 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2021-47378? +

CVE-2021-47378 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-2021-47378? +

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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