CVE-2021-46923: linux kernel Resource Exposure — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: fs/mount_setattr: always cleanup mount_kattr Make sure that finish_mount_kattr() is called after mount_kattr was succesfully built in both the success and failure case to prevent leaking any references we took when we built it. We returned early if path lookup failed thereby risking to leak an additional reference we took when building mount_kattr when an idmapped mount was requested.

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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:H/I:N/A:N

Weakness Type (CWE)

CWE-668 CWE-668

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.12.0 — 5.15.13

References

Advisories & Patches

https://git.kernel.org/stable/c/012e332286e2bb9f6ac77d195f17e74b2963d663 https://git.kernel.org/stable/c/47b5d0a7532d39e42a938f81e3904268145c341d https://git.kernel.org/stable/c/012e332286e2bb9f6ac77d195f17e74b2963d663 https://git.kernel.org/stable/c/47b5d0a7532d39e42a938f81e3904268145c341d

Frequently Asked Questions

What is CVE-2021-46923? +

In the Linux kernel, the following vulnerability has been resolved: fs/mount_setattr: always cleanup mount_kattr Make sure that finish_mount_kattr() is called after mount_kattr was succesfully built in both the success and failure case to prevent leaking any references we took when we built it. We returned early if path lookup failed thereby risking to leak an additional reference we took when building mount_kattr when an idmapped mount was requested. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-46923? +

CVE-2021-46923 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-2021-46923? +

CVE-2021-46923 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-2021-46923? +

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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