CVE-2021-47360: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: binder: make sure fd closes complete During BC_FREE_BUFFER processing, the BINDER_TYPE_FDA object cleanup may close 1 or more fds. The close operations are completed using the task work mechanism -- which means the thread needs to return to userspace or the file object may never be dereferenced -- which can lead to hung processes. Force the binder thread back to userspace if an fd is closed during BC_FREE_BUFFER handling.

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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-252 CWE-252

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.0 — 5.4.150
linux	linux_kernel	5.5 — 5.10.70
linux	linux_kernel	5.11 — 5.14.9
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/5fdb55c1ac9585eb23bb2541d5819224429e103d https://git.kernel.org/stable/c/aa2c274c279ff365a06a4cba263f04965895166e https://git.kernel.org/stable/c/b95483d8d94b41fa31a84c1d86710b7907a37621 https://git.kernel.org/stable/c/d5b0473707fa53b03a5db0256ce62b2874bddbc7 https://git.kernel.org/stable/c/5fdb55c1ac9585eb23bb2541d5819224429e103d https://git.kernel.org/stable/c/aa2c274c279ff365a06a4cba263f04965895166e https://git.kernel.org/stable/c/b95483d8d94b41fa31a84c1d86710b7907a37621 https://git.kernel.org/stable/c/d5b0473707fa53b03a5db0256ce62b2874bddbc7

Frequently Asked Questions

What is CVE-2021-47360? +

In the Linux kernel, the following vulnerability has been resolved: binder: make sure fd closes complete During BC_FREE_BUFFER processing, the BINDER_TYPE_FDA object cleanup may close 1 or more fds. The close operations are completed using the task work mechanism -- which means the thread needs to return to userspace or the file object may never be dereferenced -- which can lead to hung processes. Force the binder thread back to userspace if an fd is closed during BC_FREE_BUFFER handling. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47360? +

CVE-2021-47360 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-2021-47360? +

CVE-2021-47360 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-2021-47360? +

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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