GSD-2021-1000089 bpf: Fix masking negation logic upon negative dst register
A logic error in the Linux kernel BPF verifier allows local attackers to bypass masking checks, potentially leading to memory corruption and privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is GSD-2021-1000089?
GSD-2021-1000089 is a memory corruption vulnerability in Kernel, published on 31 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
bpf: Fix masking negation logic upon negative dst register
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.12.2 by commit 7cf64d8679ca1cb20cf57d6a88bfee79a0922a66, it was introduced in version v5.0 by commit 979d63d50c0c0f7bc537bf821e056cc9fe5abd38. For more details please see the references link.
Which versions are affected by GSD-2021-1000089?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1000089?
No fix has been published for GSD-2021-1000089 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 GSD-2021-1000089 being exploited?
There is no known exploitation of GSD-2021-1000089 in the wild and no public exploit code.