EUVD-2026-44979
GHSA-rmm6-xmjx-84r5
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Local attack vector and high privileges required to reach SMM handler; no confidentiality impact; integrity and availability high due to potential SMRAM corruption; scope unchanged per vendor's own subsequent-system assessment.
Primary rating from Vendor (lenovo).
CVSS VectorVendor: lenovo
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
A potential out-of-bounds write vulnerability could allow a local privileged attacker to modify power management settings in System Management Mode.
AnalysisAI
Out-of-bounds write in Lenovo BIOS firmware across dozens of consumer and gaming laptop models enables a local privileged attacker to corrupt power management settings within System Management Mode, a CPU execution context operating below the OS kernel at Ring -2. Successful exploitation could allow persistent firmware-level tampering that survives OS reinstalls and reboots. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access to the affected device with high OS-level privileges (administrator on Windows or root on Linux), as confirmed by CVSS 4.0 AV:L and PR:H. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.8 with vector AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N accurately captures the risk profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already compromised a target Lenovo laptop with administrator or root-level OS privileges executes a crafted payload that interfaces with the BIOS power management SMM handler, triggering an out-of-bounds write that corrupts SMRAM contents. By manipulating SMM execution flow, the attacker installs a persistent firmware-level implant that survives full OS reinstallation and cannot be detected or removed by OS-layer security tools. … |
| Remediation | The primary fix is to apply updated BIOS firmware from Lenovo for each affected model; exact patched firmware version numbers must be retrieved per-device from the Lenovo product security advisory at https://support.lenovo.com/us/en/product_security/LEN-220440, as versions differ across the extensive model list. … Detailed patch versions, workarounds, and compensating controls in full report. |
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View allOut-of-bounds write in Lenovo BIOS firmware across dozens of consumer and gaming laptop models enables a local attacker
Lenovo BIOS firmware across dozens of consumer and gaming laptop models - Legion, IdeaPad, Yoga, ThinkBook, LOQ, and V-s
SMM memory address disclosure in Lenovo laptop BIOS firmware exposes the location of protected System Management Mode (S
Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Buffer Overflow
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External POC / Exploit Code
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