CVE-2021-33639 Privilege escalation in kernel
High 7.5
Published
Updated
Check this codebase for CVE-2021-33639 and fix it if it is affected.
What it is: CVE-2021-33639 is a high-severity vulnerability in kernel, published on 8 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-33639 in the wild and no public exploit code.
Affected product: kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2021-33639/ (Markdown: https://insights.sbomify.com/CVE-2021-33639/index.md)
A local attacker can exploit the SVM driver's REMAP command to modify read-only memory, leading to privilege escalation and data integrity violations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-33639?
CVE-2021-33639 is a high-severity vulnerability in kernel, published on 8 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
REMAP cmd of SVM driver can be used to remap read only memory as read-write, then cause read only memory/file modified.
Weakness: CWE-749
Which versions are affected by CVE-2021-33639?
It affects 1 product.
Products include Openatom Openeuler Kernel.
How do I fix CVE-2021-33639?
Apply the vendor's patch.
Is CVE-2021-33639 being exploited?
There is no known exploitation of CVE-2021-33639 in the wild and no public exploit code.
Sources
Also known as GHSA-wq34-qch7-hr2g.