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CVE-2021-47292

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix memleak in io_init_wq_offload() I got memory leak report when doing fuzz test: BUG: memory leak unreferenced obj…

Published May 21, 2024CWE-401EPSS 0.19%

Overview

CVE-2021-47292 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

io_uring: fix memleak in io_init_wq_offload()

I got memory leak report when doing fuzz test:

BUG: memory leak

unreferenced object 0xffff888107310a80 (size 96):

comm "syz-executor.6", pid 4610, jiffies 4295140240 (age 20.135s)

hex dump (first 32 bytes):

01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........

backtrace:

[<000000001974933b>] kmalloc include/linux/slab.h:591 [inline]

[<000000001974933b>] kzalloc include/linux/slab.h:721 [inline]

[<000000001974933b>] io_init_wq_offload fs/io_uring.c:7920 [inline]

[<000000001974933b>] io_uring_alloc_task_context+0x466/0x640 fs/io_uring.c:7955

[<0000000039d0800d>] __io_uring_add_tctx_node+0x256/0x360 fs/io_uring.c:9016

[<000000008482e78c>] io_uring_add_tctx_node fs/io_uring.c:9052 [inline]

[<000000008482e78c>] __do_sys_io_uring_enter fs/io_uring.c:9354 [inline]

[<000000008482e78c>] __se_sys_io_uring_

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/362a9e65289284f36403058eea2462d0330c1f24Refgit.kernel.org/stable/c/502731a03f27cba1513fbbff77e508185ffce5bbRefgit.kernel.org/stable/c/362a9e65289284f36403058eea2462d0330c1f24Refgit.kernel.org/stable/c/502731a03f27cba1513fbbff77e508185ffce5bb

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47292?

CVE-2021-47292 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47292?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47292?

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-2021-47292?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47292 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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