CVE-2021-47002: linux kernel Null Dereference — Fix

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")

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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-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 5.10.221
linux	linux_kernel	5.11 — 5.11.22
linux	linux_kernel	5.12 — 5.12.5

References

Advisories & Patches

https://git.kernel.org/stable/c/1e10f58f1c9a6b667b045513c7a4e6111c24fe7c https://git.kernel.org/stable/c/3de81c1e84bf84803308da3272a829a7655c5336 https://git.kernel.org/stable/c/b9f83ffaa0c096b4c832a43964fe6bff3acffe10 https://git.kernel.org/stable/c/c664aaec9aee544538a78ba4893a44bc73a6d742 https://git.kernel.org/stable/c/1e10f58f1c9a6b667b045513c7a4e6111c24fe7c https://git.kernel.org/stable/c/3de81c1e84bf84803308da3272a829a7655c5336 https://git.kernel.org/stable/c/b9f83ffaa0c096b4c832a43964fe6bff3acffe10 https://git.kernel.org/stable/c/c664aaec9aee544538a78ba4893a44bc73a6d742

Other References

https://cert-portal.siemens.com/productcert/html/ssa-265688.html

Frequently Asked Questions

What is CVE-2021-47002? +

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") It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47002? +

CVE-2021-47002 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-2021-47002? +

CVE-2021-47002 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-2021-47002? +

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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