CVE-2021-47002 SUNRPC: Fix null pointer dereference in svc_rqst_free()

What is CVE-2021-47002?

CVE-2021-47002 is a medium-severity vulnerability in Linux kernel, published on 28 Feb 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:

SUNRPC: Fix null pointer dereference in svc_rqst_free()

When alloc_pages_node() returns null in svc_rqst_alloc(), the null rq_scratch_page pointer will be dereferenced when calling put_page() in svc_rqst_free(). Fix it by adding a null check.

Addresses-Coverity: ("Dereference after null check")

Weakness: CWE-476

Which versions are affected by CVE-2021-47002?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-47002?

No fix has been published for CVE-2021-47002 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-47002 being exploited?

There is no known exploitation of CVE-2021-47002 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 GHSA-wqm6-ppvq-v664, UBUNTU-CVE-2021-47002.