# CVE-2021-47670: linux: In the Linux kernel, the following vulnerability has been resolved:  can: peak_usb: fix use after free bugs  After ca...

CVE-2021-47670 is fixed in 38 products on 1 platform, first by DEBIAN-CVE-2021-47670, released April 17, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47670
- Priority: High
- CVSS: 8.8 (high)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 17, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  can: peak_usb: fix use after free bugs  After calling peak_usb_netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is accessed after the peak_usb_netif_rx_ni().  Reordering the lines solves the issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | bpftool almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | bpftool ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel rocky 8 | 0:4.18.0-553.69.1.el8_10 | [RLSA-2025:13589](https://patchblox.com/security/data/fix/linux/rlsa-2025-13589.md) | Sep 8, 2025 |
| Linux | kernel-abi-stablelists RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-abi-stablelists almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-abi-stablelists ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-core RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-core almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-core ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-cross-headers almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-cross-headers ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-core RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-core almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-core ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-devel RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-devel almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-devel ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-modules RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-modules almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-modules ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-modules-extra RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-modules-extra almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-debug-modules-extra ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-devel RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-devel almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-devel ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-doc RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-doc almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-doc ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-headers almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-headers ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-modules RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-modules almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-modules ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-modules-extra RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-modules-extra almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-modules-extra ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-rt RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt almalinux 8 | 4.18.0-553.69.1.rt7.410.el8_10 | [ALSA-2025:13590](https://patchblox.com/security/data/fix/linux/alsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt rocky 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RLSA-2025:13590](https://patchblox.com/security/data/fix/linux/rlsa-2025-13590.md) | Sep 8, 2025 |
| Linux | kernel-rt-core RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-core almalinux 8 | 4.18.0-553.69.1.rt7.410.el8_10 | [ALSA-2025:13590](https://patchblox.com/security/data/fix/linux/alsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-debug RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-debug almalinux 8 | 4.18.0-553.69.1.rt7.410.el8_10 | [ALSA-2025:13590](https://patchblox.com/security/data/fix/linux/alsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-debug-core RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-debug-core almalinux 8 | 4.18.0-553.69.1.rt7.410.el8_10 | [ALSA-2025:13590](https://patchblox.com/security/data/fix/linux/alsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-debug-devel RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-debug-devel almalinux 8 | 4.18.0-553.69.1.rt7.410.el8_10 | [ALSA-2025:13590](https://patchblox.com/security/data/fix/linux/alsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-debug-kvm RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-debug-modules RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-debug-modules almalinux 8 | 4.18.0-553.69.1.rt7.410.el8_10 | [ALSA-2025:13590](https://patchblox.com/security/data/fix/linux/alsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-debug-modules-extra RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-debug-modules-extra almalinux 8 | 4.18.0-553.69.1.rt7.410.el8_10 | [ALSA-2025:13590](https://patchblox.com/security/data/fix/linux/alsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-devel RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-devel almalinux 8 | 4.18.0-553.69.1.rt7.410.el8_10 | [ALSA-2025:13590](https://patchblox.com/security/data/fix/linux/alsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-kvm RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-modules RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-modules almalinux 8 | 4.18.0-553.69.1.rt7.410.el8_10 | [ALSA-2025:13590](https://patchblox.com/security/data/fix/linux/alsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-modules-extra RHEL 8 | 0:4.18.0-553.69.1.rt7.410.el8_10 | [RHSA-2025:13590](https://patchblox.com/security/data/fix/linux/rhsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-rt-modules-extra almalinux 8 | 4.18.0-553.69.1.rt7.410.el8_10 | [ALSA-2025:13590](https://patchblox.com/security/data/fix/linux/alsa-2025-13590.md) | Aug 11, 2025 |
| Linux | kernel-tools RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-tools almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-tools ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-tools-libs RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-tools-libs almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-tools-libs ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-tools-libs-devel RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-tools-libs-devel almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-tools-libs-devel ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-zfcpdump RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-zfcpdump almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-zfcpdump-core RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-zfcpdump-core almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-zfcpdump-devel RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-zfcpdump-devel almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-zfcpdump-modules RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-zfcpdump-modules almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-zfcpdump-modules-extra RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | kernel-zfcpdump-modules-extra almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | linux Debian 12.15 (bookworm) | 5.10.12-1 | [DEBIAN-CVE-2021-47670](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47670.md) | Apr 17, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.10.12-1 | [DEBIAN-CVE-2021-47670](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47670.md) | Apr 17, 2025 |
| Linux | linux Debian 14 | 5.10.12-1 | [DEBIAN-CVE-2021-47670](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47670.md) | Apr 17, 2025 |
| Linux | perf RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | perf almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | perf ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |
| Linux | python3-perf RHEL 8 | 0:4.18.0-553.69.1.el8_10 | [RHSA-2025:13589](https://patchblox.com/security/data/fix/linux/rhsa-2025-13589.md) | Aug 11, 2025 |
| Linux | python3-perf almalinux 8 | 4.18.0-553.69.1.el8_10 | [ALSA-2025:13589](https://patchblox.com/security/data/fix/linux/alsa-2025-13589.md) | Aug 11, 2025 |
| Linux | python3-perf ol 8 | 0:4.18.0-553.69.1.el8_10 | [ELSA-2025-13589](https://patchblox.com/security/data/fix/linux/elsa-2025-13589.md) | Aug 11, 2025 |

---

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