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5.5
MEDIUM CVSS 3.1
CVE-2021-47124
io_uring: fix link timeout refs
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_put_req_deferred() is called.

INFO

Published Date :

March 15, 2024, 9:15 p.m.

Last Modified :

March 13, 2025, 7:35 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2021-47124 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
Update the Linux kernel to address a vulnerability related to io_uring.
  • Update the Linux kernel to a patched version.
  • Reboot the system to apply the kernel update.
Public PoC/Exploit Available at Github

CVE-2021-47124 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-47124.

URL Resource
https://git.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530 Patch
https://git.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ff Patch
https://git.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410 Patch
https://git.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 Patch
https://git.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86 Patch
https://git.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530 Patch
https://git.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ff Patch
https://git.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410 Patch
https://git.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 Patch
https://git.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86 Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-47124 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-47124 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

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NaInSec/CVE-LIST

Ini adalah repository kumpulan CVE v.5

allcve cve cvelist newcve

Updated: 1 year, 1 month ago
2 stars 0 fork 0 watcher
Born at : March 24, 2024, 3:01 p.m. This repo has been linked 1214 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-47124 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-47124 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Mar. 13, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    Added CWE NVD-CWE-noinfo
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12.11 from (excluding) 5.12.19 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 from (excluding) 5.12.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.10.26 from (excluding) 5.10.43 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.10.44 from (excluding) 5.10.55
    Added Reference Type CVE: https://git.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530 Types: Patch
    Added Reference Type CVE: https://git.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ff Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ff Types: Patch
    Added Reference Type CVE: https://git.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410 Types: Patch
    Added Reference Type CVE: https://git.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 Types: Patch
    Added Reference Type CVE: https://git.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86 Types: Patch
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530
    Added Reference https://git.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ff
    Added Reference https://git.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410
    Added Reference https://git.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82
    Added Reference https://git.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 28, 2024

    Action Type Old Value New Value
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Mar. 15, 2024

    Action Type Old Value New Value
    Added 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_put_req_deferred() is called.
    Added Reference kernel.org https://git.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ff [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 [No types assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 5.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact