CVE-2021-47364: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: comedi: Fix memory leak in compat_insnlist() `compat_insnlist()` handles the 32-bit version of the `COMEDI_INSNLIST` ioctl (whenwhen `CONFIG_COMPAT` is enabled). It allocates memory to temporarily hold an array of `struct comedi_insn` converted from the 32-bit version in user space. This memory is only being freed if there is a fault while filling the array, otherwise it is leaked. Add a call to `kfree()` to fix the leak.

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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-401 CWE-401

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.8 — 5.10.70
linux	linux_kernel	5.11 — 5.14.9
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/8d6a21e4cd6a319b0662cbe4ad6199e276ac776a https://git.kernel.org/stable/c/bb509a6ffed2c8b0950f637ab5779aa818ed1596 https://git.kernel.org/stable/c/f217b6c1e28ed0b353634ce4d92a155b80bd1671 https://git.kernel.org/stable/c/8d6a21e4cd6a319b0662cbe4ad6199e276ac776a https://git.kernel.org/stable/c/bb509a6ffed2c8b0950f637ab5779aa818ed1596 https://git.kernel.org/stable/c/f217b6c1e28ed0b353634ce4d92a155b80bd1671

Frequently Asked Questions

What is CVE-2021-47364? +

In the Linux kernel, the following vulnerability has been resolved: comedi: Fix memory leak in compat_insnlist() `compat_insnlist()` handles the 32-bit version of the `COMEDI_INSNLIST` ioctl (whenwhen `CONFIG_COMPAT` is enabled). It allocates memory to temporarily hold an array of `struct comedi_insn` converted from the 32-bit version in user space. This memory is only being freed if there is a fault while filling the array, otherwise it is leaked. Add a call to `kfree()` to fix the leak. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47364? +

CVE-2021-47364 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-2021-47364? +

CVE-2021-47364 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-2021-47364? +

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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CVE-2021-47364