In plain words
Imagine you have a house with several doors that should only be accessible to people who already have a key to get in. But it turns out some of these doors have old locks that can be picked easily, and once inside, you can get a master key to access everything. That's roughly what these Linux vulnerabilities are - old flaws in the system that can be exploited to gain full control.
What's broken
These vulnerabilities are called DirtyAH6¹, PPPoEject², TUNderflow³, and DiagSpill⁴, and they have been in the Linux kernel for 10 to 21 years. An attacker could use them to gain root access², which means they could control the entire system. The CVE ids for these vulnerabilities are CVE-2026-80844¹, CVE-2026-81000³, CVE-2026-68121², and CVE-2026-74469⁴.
How it actually works
The bugs work by exploiting weaknesses in how Linux handles certain network and system functions. For example, TUNderflow³ is related to a buffer overflow⁵ in a specific network function, which allows an attacker to execute arbitrary code⁶. Once an attacker finds a way to exploit one of these vulnerabilities, they can use it to escalate their privileges⁷ to gain root access². This is because the vulnerabilities allow the attacker to bypass normal security checks and access parts of the system that should be restricted.
Proof of concept
There are public proofs-of-concept⁸ for these vulnerabilities, which demonstrate that they are real and can be exploited. A proof-of-concept⁸ is like a demonstration that shows the vulnerability can be used to gain access or control. It proves that the flaw is not just theoretical, but actual, and that raises the urgency for users to patch or mitigate the issue.
Is it real
It's not clear from the source if these vulnerabilities are being actively exploited in the wild. However, the fact that they have been around for so long and have now been publicly disclosed means that the risk of them being exploited is higher. Limiting factors might include the need for an attacker to already have some level of access to the system, but the vulnerabilities themselves provide a way to significantly escalate those privileges.
What to do
To fix these vulnerabilities, users should update their Linux systems with the latest patches. This will ensure that the vulnerabilities are mitigated, and the system is more secure. It's also a good idea to keep an eye on security updates and apply them promptly to prevent exploitation of known vulnerabilities.
Terms
- ¹ DirtyAH6
- , A specific type of vulnerability that allows an attacker to execute arbitrary code on a system
- ² PPPoEject
- , A type of attack where an attacker sends more data to a buffer than it is designed to hold, causing extra data to spill over into adjacent areas of memory
- ³ TUNderflow
- , A buffer overflow vulnerability in a specific network function
- ⁴ DiagSpill
- , A vulnerability that allows an attacker to access sensitive information
- ⁵ buffer overflow
- , When a program writes more data to a buffer than it is designed to hold
- ⁶ arbitrary code
- , Code that is executed by a computer, which can be malicious
- ⁷ privilege escalation
- , The process of gaining higher privileges on a system, allowing an attacker to do more damage
- ⁸ proof-of-concept
- , A demonstration that shows a vulnerability can be exploited