CVE-2021-26401 Security feature bypass in AMD Processors
Insufficient LFENCE/JMP mitigation on some AMD CPUs allows bypassing Spectre variant 2 protections, requiring microcode updates.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-26401?
CVE-2021-26401 is a medium-severity vulnerability in Amd Epyc 7232p Firmware, published on 11 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
LFENCE/JMP (mitigation V2-2) may not sufficiently mitigate CVE-2017-5715 on some AMD CPUs.
Which versions are affected by CVE-2021-26401?
It affects 126 products.
Linux distribution packages (19)
kernel Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-abi-whitelists Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-debug Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-debug-debuginfo Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-debug-devel Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-debuginfo Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-debuginfo-common-i686 Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-debuginfo-common-s390x Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-debuginfo-common-x86_64 Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-devel Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-doc Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-firmware Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-kdump Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-kdump-debuginfo Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
kernel-kdump-devel Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
perf Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
perf-debuginfo Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
python-perf Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
python-perf-debuginfo Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.49.1.el6 |
Products include Amd A10-9600p Firmware, Amd A10-9630p Firmware, Amd A12-9700p Firmware, Amd A12-9730p Firmware, Amd A4-9120 Firmware, Amd A6-9210 Firmware and 120 more.
How do I fix CVE-2021-26401?
Apply the vendor's patch.
Is CVE-2021-26401 being exploited?
There is no known exploitation of CVE-2021-26401 in the wild and no public exploit code.
Other vulnerabilities in Amd Epyc 7232p Firmware
Sources
Also known as ALPINE-CVE-2021-26401, DEBIAN-CVE-2021-26401, GHSA-4g2c-qjxv-9c24, RHSA-2023:0187, UBUNTU-CVE-2021-26401.