CVE-2021-47473 scsi: qla2xxx: Fix a memory leak in an error path of qla2x00_process_els()

What is CVE-2021-47473?

CVE-2021-47473 is a medium-severity memory corruption vulnerability in Linux kernel, published on 22 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

scsi: qla2xxx: Fix a memory leak in an error path of qla2x00_process_els()

Commit 8c0eb596baa5 ("[SCSI] qla2xxx: Fix a memory leak in an error path of qla2x00_process_els()"), intended to change:

bsg_job->request->msgcode == FC_BSG_HST_ELS_NOLOGIN

bsg_job->request->msgcode != FC_BSG_RPT_ELS

but changed it to:

bsg_job->request->msgcode == FC_BSG_RPT_ELS

instead.

Change the == to a != to avoid leaking the fcport structure or freeing unallocated memory.

Weakness: CWE-401

Which versions are affected by CVE-2021-47473?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-47473?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-47473 being exploited?

There is no known exploitation of CVE-2021-47473 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-47473, GHSA-28j2-gr4p-p982, UBUNTU-CVE-2021-47473.