GSD-2021-1001340 x86/signal: Detect and prevent an alternate signal stack overflow
A local attacker can exploit an alternate signal stack overflow in the Linux kernel to cause memory corruption, potentially leading to privilege escalation or system crash.
- 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-2021-1001340?
GSD-2021-1001340 is a memory corruption vulnerability in Kernel, published on 3 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
x86/signal: Detect and prevent an alternate signal stack overflow
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 v5.4.134 by commit 00fcd8f33e9b9f57115c3b1cfc4cb96450c18796, it was introduced in version v3.15 by commit c2bc11f10a39527cd1bb252097b5525664560956. For more details please see the references link.
Which versions are affected by GSD-2021-1001340?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1001340?
No fix has been published for GSD-2021-1001340 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-2021-1001340 being exploited?
There is no known exploitation of GSD-2021-1001340 in the wild and no public exploit code.