CVE-2021-47190: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: perf bpf: Avoid memory leak from perf_env__insert_btf() perf_env__insert_btf() doesn't insert if a duplicate BTF id is encountered and this causes a memory leak. Modify the function to return a success/error value and then free the memory if insertion didn't happen. v2. Adds a return -1 when the insertion error occurs in perf_env__fetch_btf. This doesn't affect anything as the result is never checked.

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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	5.1 — 5.4.162
linux	linux_kernel	5.5 — 5.10.82
linux	linux_kernel	5.11 — 5.15.5

References

Advisories & Patches

https://git.kernel.org/stable/c/11589d3144bc4e272e0aae46ce8156162e99babc https://git.kernel.org/stable/c/4924b1f7c46711762fd0e65c135ccfbcfd6ded1f https://git.kernel.org/stable/c/642fc22210a5e59d40b1e4d56d21ec3effd401f2 https://git.kernel.org/stable/c/ab7c3d8d81c511ddfb27823fb07081c96422b56e https://git.kernel.org/stable/c/11589d3144bc4e272e0aae46ce8156162e99babc https://git.kernel.org/stable/c/4924b1f7c46711762fd0e65c135ccfbcfd6ded1f https://git.kernel.org/stable/c/642fc22210a5e59d40b1e4d56d21ec3effd401f2 https://git.kernel.org/stable/c/ab7c3d8d81c511ddfb27823fb07081c96422b56e

Frequently Asked Questions

What is CVE-2021-47190? +

In the Linux kernel, the following vulnerability has been resolved: perf bpf: Avoid memory leak from perf_env__insert_btf() perf_env__insert_btf() doesn't insert if a duplicate BTF id is encountered and this causes a memory leak. Modify the function to return a success/error value and then free the memory if insertion didn't happen. v2. Adds a return -1 when the insertion error occurs in perf_env__fetch_btf. This doesn't affect anything as the result is never checked. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47190? +

CVE-2021-47190 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-2021-47190? +

CVE-2021-47190 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-2021-47190? +

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-2021-47190