What is CVE-2021-47040?

CVE-2021-47040 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 5.8 onward and patched in 5.10.37, 5.11.21, 5.12.4 and others. CVE-2021-47040 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47040?

CVE-2021-47040 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-47040?

Yes, CVE-2021-47040 has been patched. Fixed versions include 5.10.37, 5.11.21, 5.12.4 and others. If you are running Linux kernel 5.8 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47040 actively exploited?

CVE-2021-47040 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47040

High

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix overflows checks in provide buffers Colin reported before possible overflow and sign extension problems in io_provide_buffers_prep(). As Linus pointed out previous attempt did nothing useful, see d81269fecb8ce ("io_uring: fix provide_buffers sign extension"). Do that with help of check_<op>_overflow helpers. And fix struct io_provide_buf::len type, as it doesn't make much sense to keep it signed.

Package Linux Kernel

Published 2024-02-28

Last modified 2025-01-09

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-120

CVE-2021-47040 is classified as CWE-120

See CWE-120 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 5.8 and later are affected. Fixed in 5.10.37, 5.11.21, 5.12.4, 5.13 and their respective stable series.

Affected from

≥ 5.8

Fixed in

✓ 5.10.37 5.10.x ✓ 5.11.21 5.11.x ✓ 5.12.4 5.12.x ✓ 5.13

References

4 total

Kernel Git
https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7

Patch
Kernel Git
https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9

Patch
Kernel Git
https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03

Patch
Kernel Git
https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d

Patch

Details

CVE ID CVE-2021-47040

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-02-28

Modified 2025-01-09

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47040?

CVE-2021-47040 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 5.8 onward and has been patched in 5.10.37, 5.11.21, 5.12.4 and others. CVE-2021-47040 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47040?

CVE-2021-47040 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-47040?

Yes. CVE-2021-47040 has been patched. Fixed versions include 5.10.37, 5.11.21, 5.12.4 and others. If you are running Linux kernel 5.8 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47040 actively exploited?

No. CVE-2021-47040 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.