Heap-based buffer overflow in Linux kernel - CVE-2026-80671
Published: August 28, 2026
Vulnerability identifier: #VU146126
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: CVE-2026-80671
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-80671
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3