What is CVE-2021-47203?

CVE-2021-47203 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Out-of-bounds Write flaw (CWE-787), affecting Linux kernel versions from 2.6.36 onward and patched in 4.4.293, 4.9.291, 4.14.256 and others. CVE-2021-47203 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47203?

CVE-2021-47203 has a CVSS score of 5.5 out of 10, rated Medium severity. 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-2021-47203?

Yes, CVE-2021-47203 has been patched. Fixed versions include 4.4.293, 4.9.291, 4.14.256 and others. If you are running Linux kernel 2.6.36 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47203 actively exploited?

CVE-2021-47203 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/787.html

CVE-2021-47203

Medium

In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq() When parsing the txq list in lpfc_drain_txq(), the driver attempts to pass the requests to the adapter. If such an attempt fails, a local "fail_msg" string is set and a log message output. The job is then added to a completions list for cancellation. Processing of any further jobs from the txq list continues, but since "fail_msg" remains set, jobs are added to the completions list regardless of whether a wqe was passed to the adapter. If successfully added to txcmplq, jobs are added to both lists resulting in list corruption. Fix by clearing the fail_msg string after adding a job to the completions list. This stops the subsequent jobs from being added to the completions list unless they had an appropriate failure.

Package Linux Kernel

Published 2024-04-10

Last modified 2025-03-27

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

Weakness type

CWE-787

CVE-2021-47203 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

The product writes data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 2.6.36 and later are affected. Fixed in 4.4.293, 4.9.291, 4.14.256, 4.19.218, 5.4.162, 5.10.82, 5.15.5, 5.16 and their respective stable series.

Affected from

≥ 2.6.36

Fixed in

✓ 4.4.293 4.4.x ✓ 4.9.291 4.9.x ✓ 4.14.256 4.14.x ✓ 4.19.218 4.19.x ✓ 5.4.162 5.4.x ✓ 5.10.82 5.10.x ✓ 5.15.5 5.15.x ✓ 5.16

References

8 total

Kernel Git
https://git.kernel.org/stable/c/16bcbfb56d759c25665f786e33ec633b9508a08f

Patch
Kernel Git
https://git.kernel.org/stable/c/814d3610c4ce86e8cf285b2cdac0057a42e82de5

Patch
Kernel Git
https://git.kernel.org/stable/c/99154581b05c8fb22607afb7c3d66c1bace6aa5d

Patch
Kernel Git
https://git.kernel.org/stable/c/ad4776b5eb2e58af1226847fcd3b4f6d051674dd

Patch
Kernel Git
https://git.kernel.org/stable/c/b291d147d0268e93ad866f8bc820ea14497abc9b

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2021-47203

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-04-10

Modified 2025-03-27

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47203?

CVE-2021-47203 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . It affects Linux kernel versions from 2.6.36 onward and has been patched in 4.4.293, 4.9.291, 4.14.256 and others. CVE-2021-47203 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47203?

CVE-2021-47203 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-2021-47203?

Yes. CVE-2021-47203 has been patched. Fixed versions include 4.4.293, 4.9.291, 4.14.256 and others. If you are running Linux kernel 2.6.36 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47203 actively exploited?

No. CVE-2021-47203 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.