CVE-2021-26401

LFENCE/JMP (mitigation V2-2) may not sufficiently mitigate CVE-2017-5715 on some AMD CPUs.

Published: 2022-03-11 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-26401 is rated Low Risk (29.5/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.28%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-26401

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.13% 0.28% +0.15%
2 2025-11-21 0.16% 0.13% -0.02%
3 2025-11-18 — 0.16% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-26401

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.6 3.1 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.1 4.0 [email protected]
1.9 2.0 LOW
AV:L/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.4 2.9 [email protected]

Weakness enumeration for CVE-2021-26401

OS Trackers for CVE-2021-26401

vendor priority summary link
debian not yet assigned CVE-2021-26401 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-26401
redhat medium — https://access.redhat.com/security/cve/CVE-2021-26401
suse medium CVE-2021-26401 severity moderate: SUSE including 114 source package names (arm-trusted-firmware, arm-trusted-firmware-tools, …), 360 product×package rows across 100 product lines (HPE Helion OpenStack 8, Image SLES12-SP5-EC2-BYOS, … (100 product lines)): Fixed 341, Known Not Affected 19. https://www.suse.com/security/cve/CVE-2021-26401/
ubuntu medium CVE-2021-26401 medium priority: Ubuntu including 167 source packages (linux, linux-allwinner, …), 2042 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1576, released 232, not-affected 191, ignored 42, needed 1. https://ubuntu.com/security/CVE-2021-26401

Affected software / configurations for CVE-2021-26401

Vendor Product Version Raw CPE
amd athlon_x4_940_firmware — cpe:2.3:o:amd:athlon_x4_940_firmware:-:*:*:*:*:*:*:*
amd athlon_x4_950_firmware — cpe:2.3:o:amd:athlon_x4_950_firmware:-:*:*:*:*:*:*:*
amd athlon_x4_970_firmware — cpe:2.3:o:amd:athlon_x4_970_firmware:-:*:*:*:*:*:*:*
amd athlon_x4_835_firmware — cpe:2.3:o:amd:athlon_x4_835_firmware:-:*:*:*:*:*:*:*
amd athlon_x4_845_firmware — cpe:2.3:o:amd:athlon_x4_845_firmware:-:*:*:*:*:*:*:*
amd athlon_x4_830_firmware — cpe:2.3:o:amd:athlon_x4_830_firmware:-:*:*:*:*:*:*:*
amd athlon_x4_840_firmware — cpe:2.3:o:amd:athlon_x4_840_firmware:-:*:*:*:*:*:*:*
amd athlon_x4_860k_firmware — cpe:2.3:o:amd:athlon_x4_860k_firmware:-:*:*:*:*:*:*:*
amd athlon_x4_870k_firmware — cpe:2.3:o:amd:athlon_x4_870k_firmware:-:*:*:*:*:*:*:*
amd athlon_x4_880k_firmware — cpe:2.3:o:amd:athlon_x4_880k_firmware:-:*:*:*:*:*:*:*
amd athlon_x4_750_firmware — cpe:2.3:o:amd:athlon_x4_750_firmware:-:*:*:*:*:*:*:*
amd athlon_x4_760k_firmware — cpe:2.3:o:amd:athlon_x4_760k_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_5995wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_5995wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_5975wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_5975wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_5965wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_5965wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_5955wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_5955wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_5945wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_5945wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_2990wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_2990wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_2970wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_2970wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_2950x_firmware — cpe:2.3:o:amd:ryzen_threadripper_2950x_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_2920x_firmware — cpe:2.3:o:amd:ryzen_threadripper_2920x_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_3970x_firmware — cpe:2.3:o:amd:ryzen_threadripper_3970x_firmware:-:*:*:*:*:*:*:*
amd a12-9730p_firmware — cpe:2.3:o:amd:a12-9730p_firmware:-:*:*:*:*:*:*:*
amd a12-9700p_firmware — cpe:2.3:o:amd:a12-9700p_firmware:-:*:*:*:*:*:*:*
amd a10-9630p_firmware — cpe:2.3:o:amd:a10-9630p_firmware:-:*:*:*:*:*:*:*
amd a10-9600p_firmware — cpe:2.3:o:amd:a10-9600p_firmware:-:*:*:*:*:*:*:*
amd a9-9420_firmware — cpe:2.3:o:amd:a9-9420_firmware:-:*:*:*:*:*:*:*
amd a9-9410_firmware — cpe:2.3:o:amd:a9-9410_firmware:-:*:*:*:*:*:*:*
amd a6-9220_firmware — cpe:2.3:o:amd:a6-9220_firmware:-:*:*:*:*:*:*:*
amd a6-9220c_firmware — cpe:2.3:o:amd:a6-9220c_firmware:-:*:*:*:*:*:*:*
amd a6-9210_firmware — cpe:2.3:o:amd:a6-9210_firmware:-:*:*:*:*:*:*:*
amd a4-9120_firmware — cpe:2.3:o:amd:a4-9120_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_2700x_firmware — cpe:2.3:o:amd:ryzen_7_2700x_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_2700_firmware — cpe:2.3:o:amd:ryzen_7_2700_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_2600x_firmware — cpe:2.3:o:amd:ryzen_5_2600x_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_2600_firmware — cpe:2.3:o:amd:ryzen_5_2600_firmware:-:*:*:*:*:*:*:*
amd ryzen_9_3950x_firmware — cpe:2.3:o:amd:ryzen_9_3950x_firmware:-:*:*:*:*:*:*:*
amd ryzen_9_3900x_firmware — cpe:2.3:o:amd:ryzen_9_3900x_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_3800x_firmware — cpe:2.3:o:amd:ryzen_7_3800x_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_3700x_firmware — cpe:2.3:o:amd:ryzen_7_3700x_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_3600x_firmware — cpe:2.3:o:amd:ryzen_5_3600x_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_3600_firmware — cpe:2.3:o:amd:ryzen_5_3600_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_3400g_firmware — cpe:2.3:o:amd:ryzen_5_3400g_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3300x_firmware — cpe:2.3:o:amd:ryzen_3_3300x_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3300g_firmware — cpe:2.3:o:amd:ryzen_3_3300g_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3100_firmware — cpe:2.3:o:amd:ryzen_3_3100_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_4700g_firmware — cpe:2.3:o:amd:ryzen_7_4700g_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_4700ge_firmware — cpe:2.3:o:amd:ryzen_7_4700ge_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_4600g_firmware — cpe:2.3:o:amd:ryzen_5_4600g_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_4600ge_firmware — cpe:2.3:o:amd:ryzen_5_4600ge_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_4300g_firmware — cpe:2.3:o:amd:ryzen_3_4300g_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_4300ge_firmware — cpe:2.3:o:amd:ryzen_3_4300ge_firmware:-:*:*:*:*:*:*:*
amd athlon_gold_3450g_firmware — cpe:2.3:o:amd:athlon_gold_3450g_firmware:-:*:*:*:*:*:*:*
amd athlon_gold_3150ge_firmware — cpe:2.3:o:amd:athlon_gold_3150ge_firmware:-:*:*:*:*:*:*:*
amd athlon_silver_3050ge_firmware — cpe:2.3:o:amd:athlon_silver_3050ge_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_2200u_firmware — cpe:2.3:o:amd:ryzen_3_2200u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_2300u_firmware — cpe:2.3:o:amd:ryzen_3_2300u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_pro_2300u_firmware — cpe:2.3:o:amd:ryzen_3_pro_2300u_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_2500u_firmware — cpe:2.3:o:amd:ryzen_5_2500u_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_pro_2500u_firmware — cpe:2.3:o:amd:ryzen_5_pro_2500u_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_2600h_firmware — cpe:2.3:o:amd:ryzen_5_2600h_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_2700u_firmware — cpe:2.3:o:amd:ryzen_7_2700u_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_pro_2700u_firmware — cpe:2.3:o:amd:ryzen_7_pro_2700u_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_2800h_firmware — cpe:2.3:o:amd:ryzen_7_2800h_firmware:-:*:*:*:*:*:*:*
amd athlon_gold_3150u_firmware — cpe:2.3:o:amd:athlon_gold_3150u_firmware:-:*:*:*:*:*:*:*
amd athlon_silver_3050u_firmware — cpe:2.3:o:amd:athlon_silver_3050u_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_pro_3700u_firmware — cpe:2.3:o:amd:ryzen_7_pro_3700u_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_pro_3500u_firmware — cpe:2.3:o:amd:ryzen_5_pro_3500u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_pro_3300u_firmware — cpe:2.3:o:amd:ryzen_3_pro_3300u_firmware:-:*:*:*:*:*:*:*
amd athlon_pro_300u_firmware — cpe:2.3:o:amd:athlon_pro_300u_firmware:-:*:*:*:*:*:*:*
amd ryzen_9_5980hx_firmware — cpe:2.3:o:amd:ryzen_9_5980hx_firmware:-:*:*:*:*:*:*:*
amd ryzen_9_5980hs_firmware — cpe:2.3:o:amd:ryzen_9_5980hs_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_5825u_firmware — cpe:2.3:o:amd:ryzen_7_5825u_firmware:-:*:*:*:*:*:*:*
amd ryzen_9_5900hx_firmware — cpe:2.3:o:amd:ryzen_9_5900hx_firmware:-:*:*:*:*:*:*:*
amd ryzen_9_5900hs_firmware — cpe:2.3:o:amd:ryzen_9_5900hs_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_5625u_firmware — cpe:2.3:o:amd:ryzen_5_5625u_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_5800h_firmware — cpe:2.3:o:amd:ryzen_7_5800h_firmware:-:*:*:*:*:*:*:*
amd ryzen_7_5800hs_firmware — cpe:2.3:o:amd:ryzen_7_5800hs_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_5600h_firmware — cpe:2.3:o:amd:ryzen_5_5600h_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_5600hs_firmware — cpe:2.3:o:amd:ryzen_5_5600hs_firmware:-:*:*:*:*:*:*:*

References for CVE-2021-26401

cvelogic Threat Intelligence