CVE-2021-47124

Medium

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.

Package Linux Kernel
Published 2024-03-15
Last modified 2025-03-13
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

5.5

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 5.10.26, 5.11.6, 5.12 and later are affected. Fixed in 5.10.43, 5.10.55, 5.12.10, 5.12.19, 5.13 and their respective stable series.

Affected from
≥ 5.10.26 ≥ 5.11.6 ≥ 5.12
Fixed in
✓ 5.10.43 5.10.x ✓ 5.10.55 5.10.x ✓ 5.12.10 5.12.x ✓ 5.12.19 5.12.x ✓ 5.13

References

5 total

Frequently asked questions

  • What is CVE-2021-47124?

    CVE-2021-47124 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.10.26 onward and has been patched in 5.10.43, 5.10.55, 5.12.10 and others. CVE-2021-47124 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-47124?

    CVE-2021-47124 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H .

  • Is there a patch available for CVE-2021-47124?

    Yes. CVE-2021-47124 has been patched. Fixed versions include 5.10.43, 5.10.55, 5.12.10 and others. If you are running Linux kernel 5.10.26 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2021-47124 actively exploited?

    No. CVE-2021-47124 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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