CVE-2021-47203

MEDIUM
Published Apr 10, 2024 Modified Mar 27, 2025 CWE-787

Description

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.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-787 Out-of-bounds Write

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/16bcbfb56d759c25665f786e33ec633b9508a08f https://git.kernel.org/stable/c/814d3610c4ce86e8cf285b2cdac0057a42e82de5 https://git.kernel.org/stable/c/99154581b05c8fb22607afb7c3d66c1bace6aa5d https://git.kernel.org/stable/c/ad4776b5eb2e58af1226847fcd3b4f6d051674dd https://git.kernel.org/stable/c/b291d147d0268e93ad866f8bc820ea14497abc9b https://git.kernel.org/stable/c/c097bd5a59162156d9c2077a2f58732ffbaa9fca https://git.kernel.org/stable/c/ec70d80a8642900086447ba0cdc79e3f44d42e8f https://git.kernel.org/stable/c/f05a0191b90156e539cccc189b9d87ca2a4d9305 https://git.kernel.org/stable/c/16bcbfb56d759c25665f786e33ec633b9508a08f https://git.kernel.org/stable/c/814d3610c4ce86e8cf285b2cdac0057a42e82de5 https://git.kernel.org/stable/c/99154581b05c8fb22607afb7c3d66c1bace6aa5d https://git.kernel.org/stable/c/ad4776b5eb2e58af1226847fcd3b4f6d051674dd https://git.kernel.org/stable/c/b291d147d0268e93ad866f8bc820ea14497abc9b https://git.kernel.org/stable/c/c097bd5a59162156d9c2077a2f58732ffbaa9fca https://git.kernel.org/stable/c/ec70d80a8642900086447ba0cdc79e3f44d42e8f https://git.kernel.org/stable/c/f05a0191b90156e539cccc189b9d87ca2a4d9305

Frequently Asked Questions

What is CVE-2021-47203? +
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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2021-47203? +
CVE-2021-47203 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2021-47203? +
CVE-2021-47203 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2021-47203? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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