# CVE-2026-80671: linux: In the Linux kernel, the following vulnerability has been resolved:  perf sched: Fix register_pid() overflow, strcpy,...

CVE-2026-80671 is fixed in 57 products on 1 platform, first by DEBIAN-CVE-2026-80671, released August 29, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-80671
- Priority: Urgent
- CVSS: 9.3 (critical)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 28, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | bpftool-debuginfo amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | bpftool6.12 amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | bpftool6.18 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel-debuginfo amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel-devel amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel-headers amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel-livepatch-6.1.188-233.385 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel-livepatch-6.12.110-135.201 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel-livepatch-6.18.41-94.142 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel-modules-extra amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel-modules-extra-common amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel-tools amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel-tools-debuginfo amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel-tools-devel amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | kernel6.12 amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel6.12-devel amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel6.12-headers amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel6.12-tools amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | kernel6.18 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel6.18-devel amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel6.18-headers amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel6.18-tools amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.190-1 | [DEBIAN-CVE-2026-80671](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80671.md) | Aug 29, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.111-1 | [DEBIAN-CVE-2026-80671](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80671.md) | Aug 29, 2026 |
| Linux | linux Debian 14 | 7.1.5-1 | [DEBIAN-CVE-2026-80671](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80671.md) | Aug 29, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.111-1~deb12u1 | [DEBIAN-CVE-2026-80671](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80671.md) | Aug 29, 2026 |
| Linux | microvm-kernel6.18 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | perf amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | perf-debuginfo amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | perf6.12 amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | perf6.18 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | python3-perf amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | python3-perf-debuginfo amzn 2023 | 1:6.1.188-233.385.amzn2023 | [ALAS2023-2026-3197](https://patchblox.com/security/data/fix/linux/alas2023-2026-3197.md) | Nov 7, 2026 |
| Linux | python3-perf6.12 amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.110-135.201.amzn2023 | [ALAS2023-2026-3196](https://patchblox.com/security/data/fix/linux/alas2023-2026-3196.md) | Nov 7, 2026 |
| Linux | python3-perf6.18 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |
| Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 |

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