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CVE-2021-47124

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix link timeout refs WARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount…

Published Mar 15, 2024EPSS 0.24%

Overview

CVE-2021-47124 is a high-severity vulnerability. It was published on March 15, 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:

io_uring: fix link timeout refs

WARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28

RIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28

Call Trace:

__refcount_sub_and_test include/linux/refcount.h:283 [inline]

__refcount_dec_and_test include/linux/refcount.h:315 [inline]

refcount_dec_and_test include/linux/refcount.h:333 [inline]

io_put_req fs/io_uring.c:2140 [inline]

io_queue_linked_timeout fs/io_uring.c:6300 [inline]

__io_queue_sqe+0xbef/0xec0 fs/io_uring.c:6354

io_submit_sqe fs/io_uring.c:6534 [inline]

io_submit_sqes+0x2bbd/0x7c50 fs/io_uring.c:6660

__do_sys_io_uring_enter fs/io_uring.c:9240 [inline]

__se_sys_io_uring_enter+0x256/0x1d60 fs/io_uring.c:9182

io_link_timeout_fn() should put only one reference of the linked timeout

request, however in case of racing with the master request's completion

first io_req_complete() puts one and then io_pu

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/0b2a990e5d2f76d020cb840c456e6ec5f0c27530Refgit.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ffRefgit.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410Refgit.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82Refgit.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86Refgit.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530Refgit.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ffRefgit.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410Refgit.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82Refgit.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47124?

CVE-2021-47124 is a high-severity vulnerability. It was published on March 15, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47124?

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-2021-47124?

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-2021-47124?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47124 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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