CVE-2021-41839 Memory corruption in n/a
An untrusted pointer dereference in InsydeH2O BIOS allows attackers to corrupt SMRAM and escalate privileges to System Management Mode.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-41839?
CVE-2021-41839 is a high-severity memory corruption vulnerability in Insyde Insydeh2o, published on 3 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.
Weakness: CWE-119
Which versions are affected by CVE-2021-41839?
It affects 1 product.
Products include Insyde Insydeh2o.
How do I fix CVE-2021-41839?
No fix has been published for CVE-2021-41839 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-41839 being exploited?
There is no known exploitation of CVE-2021-41839 in the wild and no public exploit code.
Other vulnerabilities in Insyde Insydeh2o
Sources
Also known as GHSA-xg99-57hh-rfjv.