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CVE-2021-47190: perf bpf: Avoid memory leak from perf_env__insert_btf()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-04-10 · updated 2026-06-17
• Weakness: CWE-401

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.

Affected products

• Linux kernel: from 5.1 before 5.4.162; from 5.5 before 5.10.82; from 5.11 before 5.15.5 — fixed in 5.10.82, 5.15.5, 5.4.162

How to fix

Upgrade to a fixed version: Linux kernel 5.10.82, 5.15.5, 5.4.162. Check the vendor advisory for mitigations.

References

• 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

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