SB20260828101 - Heap-based buffer overflow in Linux kernel perf

Description

This security bulletin contains information about 1 vulnerability.

1) Heap-based buffer overflow (CVE-ID: CVE-2026-80671)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to heap-based buffer overflow in register_pid() in tools/perf/builtin-sched.c when processing an untrusted comm string from perf.data. A local user can supply a crafted perf.data file containing an oversized comm value to cause a denial of service.

The overflow occurs because the comm value is copied into a fixed 20-byte COMM_LEN buffer without a length check.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5949d339f5ec98752d56dcd4e36f619a59d513a5
• https://git.kernel.org/stable/c/5ea1dcc9418c4e06ce29ed5170596f497ba86872
• https://git.kernel.org/stable/c/652cea73b7b7b7c622a2be670e44e3c499c6d49f