CVE-2026-80671: Linux Vulnerability (CVSS 9.3)

Description

In the Linux kernel, the following vulnerability has been resolved: perf sched: Fix register_pid() overflow, strcpy, and BUG_ON register_pid() has several issues when processing untrusted perf.data: 1. Integer overflow: (pid + 1) * sizeof(struct task_desc *) can wrap to a small value on 32-bit systems when pid is large (e.g. 0x40000000), causing realloc to return a tiny buffer followed by out-of-bounds writes in the initialization loop. 2. Heap buffer overflow: strcpy(task->comm, comm) copies the untrusted comm string into a fixed 20-byte COMM_LEN buffer with no length check. 3. BUG_ON on allocation failure: perf.data is untrusted input, so allocation failures should be handled gracefully rather than killing the process. 4. Realloc of sched->tasks assigned directly back, leaking the old pointer on failure; nr_tasks incremented before the realloc, leaving corrupted state on failure. Cap pid at PID_MAX_LIMIT (4194304, matching the kernel's maximum on 64-bit), replace strcpy with strlcpy, guard against NULL comm, replace BUG_ON with NULL returns using safe realloc patterns, and add NULL checks in callers that dereference the result.

Metrics

CVSS 3.1

9.3/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

0.16%

5.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 344e59fc4f2cba6dc04ce5e2a77388645d4ca834; >= ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 22263d241bad753217d545f8085b7ead52e2873b; >= ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 2003918e13f43cf6c5698be3cc9aa3657dd676a8; >= ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 29639f00bfa49da7904ba0a499e0da7a0e5d735e; >= ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 261d2b5f4afa0570ca906e553c93811c5abe4590; >= ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 652cea73b7b7b7c622a2be670e44e3c499c6d49f; >= ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 5ea1dcc9418c4e06ce29ed5170596f497ba86872; >= ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 5949d339f5ec98752d56dcd4e36f619a59d513a5
Linux	Linux	2.6.32

References

Timeline

Published: Aug 28, 2026
Last Modified: Sep 14, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-80671?

In the Linux kernel, the following vulnerability has been resolved: perf sched: Fix register_pid() overflow, strcpy, and BUG_ON register_pid() has several issues when processing untrusted perf.data: 1. Integer overflow: (pid + 1) * sizeof(struct task_desc *) can wrap to a small value on 32-bit systems when pid is large (e.g. 0x40000000), causing realloc to return a tiny buffer followed by out-of-bounds writes in the initialization loop. 2. Heap buffer overflow: strcpy(task->comm, comm) copies the untrusted comm string into a fixed 20-byte COMM_LEN buffer with no length check. 3. BUG_ON on allocation failure: perf.data is untrusted input, so allocation failures should be handled gracefully rather than killing the process. 4. Realloc of sched->tasks assigned directly back, leaking the old pointer on failure; nr_tasks incremented before the realloc, leaving corrupted state on failure. Cap pid at PID_MAX_LIMIT (4194304, matching the kernel's maximum on 64-bit), replace strcpy with strlcpy, guard against NULL comm, replace BUG_ON with NULL returns using safe realloc patterns, and add NULL checks in callers that dereference the result.

How severe is CVE-2026-80671?

CVE-2026-80671 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.

How do I fix CVE-2026-80671?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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