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CVE-2021-46938

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: dm rq: fix double free of blk_mq_tag_set in dev remove after table load fails When loading a device-mapper table for a request-…

Published Feb 27, 2024CWE-415EPSS 0.25%

Overview

CVE-2021-46938 is a high-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

dm rq: fix double free of blk_mq_tag_set in dev remove after table load fails

When loading a device-mapper table for a request-based mapped device,

and the allocation/initialization of the blk_mq_tag_set for the device

fails, a following device remove will cause a double free.

E.g. (dmesg):

device-mapper: core: Cannot initialize queue for request-based dm-mq mapped device

device-mapper: ioctl: unable to set up device queue for new table.

Unable to handle kernel pointer dereference in virtual kernel address space

Failing address: 0305e098835de000 TEID: 0305e098835de803

Fault in home space mode while using kernel ASCE.

AS:000000025efe0007 R3:0000000000000024

Oops: 0038 ilc:3 [#1] SMP

Modules linked in: ... lots of modules ...

Supported: Yes, External

CPU: 0 PID: 7348 Comm: multipathd Kdump: loaded Tainted: G W X 5.3.18-53-default #1 SLE15-SP3

Hardware name: IBM 8561 T01 7I2 (LPAR)

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1cb02dc76f4c0a2749a02b26469512d6984252e9Refgit.kernel.org/stable/c/6086f957416a6e87236c06079fcaba7a3998aecaRefgit.kernel.org/stable/c/772b9f59657665af3b68d24d12b9d172d31f0dfbRefgit.kernel.org/stable/c/8ae0185255eaf05bd66f4215c81e99bf01140fd9Refgit.kernel.org/stable/c/8e947c8f4a5620df77e43c9c75310dc510250166Refgit.kernel.org/stable/c/a992a283c0b77d0a7c2c348add0e6a21fb1dab67Refgit.kernel.org/stable/c/b42c0a33dfdd451d9be62dd5de58c39f2750b6e3Refgit.kernel.org/stable/c/d757bf4c69cda3c3ab7f775dfabbf5a80e2f6f9dRefgit.kernel.org/stable/c/1cb02dc76f4c0a2749a02b26469512d6984252e9Refgit.kernel.org/stable/c/6086f957416a6e87236c06079fcaba7a3998aeca

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46938?

CVE-2021-46938 is a high-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-46938?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-46938?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-46938?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46938 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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