CVSS 3.1
3.3 lowCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NCVE-2021-26342
Low (3.3) in amd. EPSS 0.2% chance of exploitation in the next 30 days.
In SEV guest VMs, the CPU may fail to flush the Translation Lookaside Buffer (TLB) following a particular sequence of operations that includes creation of a new virtual machine control block (VMCB). The failure to flush the TLB may cause the microcode to use stale TLB translations which may allow for disclosure of SEV guest memory contents. Users of SEV-ES/SEV-SNP guest VMs are not impacted by this vulnerability.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 13% of CVEs (scores of 2026-10-31)
- Published
- Modified
- Record from
- the NVD, synced
Affected
- amd:epyc_7001_firmware
- amd:epyc_7251_firmware
- amd:epyc_7261_firmware
- amd:epyc_7281_firmware
- amd:epyc_72f3_firmware
- amd:epyc_7301_firmware
- amd:epyc_7313_firmware
- amd:epyc_7313p_firmware
- amd:epyc_7343_firmware
- amd:epyc_7351_firmware
- amd:epyc_7351p_firmware
- amd:epyc_7371_firmware
- amd:epyc_7373x_firmware
- amd:epyc_73f3_firmware
- amd:epyc_7401_firmware
- amd:epyc_7401p_firmware
- amd:epyc_7413_firmware
- amd:epyc_7443_firmware
- amd:epyc_7443p_firmware
- amd:epyc_7451_firmware
- amd:epyc_7453_firmware
- amd:epyc_7473x_firmware
- amd:epyc_74f3_firmware
- amd:epyc_7501_firmware
- amd:epyc_7513_firmware
- amd:epyc_7543_firmware
- amd:epyc_7543p_firmware
- amd:epyc_7551_firmware
- amd:epyc_7551p_firmware
- amd:epyc_7573x_firmware
- amd:epyc_75f3_firmware
- amd:epyc_7601_firmware
- amd:epyc_7643_firmware
- amd:epyc_7663_firmware
- amd:epyc_7713_firmware
- amd:epyc_7713p_firmware
- amd:epyc_7763_firmware
- amd:epyc_7773x_firmware