CVE-2021-47616: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA: Fix use-after-free in rxe_queue_cleanup On error handling path in rxe_qp_from_init() qp->sq.queue is freed and then rxe_create_qp() will drop last reference to this object. qp clean up function will try to free this queue one time and it causes UAF bug. Fix it by zeroing queue pointer after freeing queue in rxe_qp_from_init().

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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	5.15 — 5.15.10

References

Advisories & Patches

https://git.kernel.org/stable/c/84b01721e8042cdd1e8ffeb648844a09cd4213e0 https://git.kernel.org/stable/c/acb53e47db1fbc7cd37ab10b46388f045a76e383 https://git.kernel.org/stable/c/84b01721e8042cdd1e8ffeb648844a09cd4213e0 https://git.kernel.org/stable/c/acb53e47db1fbc7cd37ab10b46388f045a76e383

Frequently Asked Questions

What is CVE-2021-47616? +

In the Linux kernel, the following vulnerability has been resolved: RDMA: Fix use-after-free in rxe_queue_cleanup On error handling path in rxe_qp_from_init() qp->sq.queue is freed and then rxe_create_qp() will drop last reference to this object. qp clean up function will try to free this queue one time and it causes UAF bug. Fix it by zeroing queue pointer after freeing queue in rxe_qp_from_init(). It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47616? +

CVE-2021-47616 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-2021-47616? +

CVE-2021-47616 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-2021-47616? +

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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