CVE-2009-2847 Information disclosure in n/a

Medium 4.9 Published 18 Aug 2009 Updated 7 Aug 2024

Local attackers can read sensitive kernel stack data via sigaltstack on 64-bit Linux systems due to uncleared padding bytes.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2009-2847?

CVE-2009-2847 is a medium-severity vulnerability in Linux kernel, published on 18 Aug 2009. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The do_sigaltstack function in kernel/signal.c in Linux kernel 2.4 through 2.4.37 and 2.6 before 2.6.31-rc5, when running on 64-bit systems, does not clear certain padding bytes from a structure, which allows local users to obtain sensitive information from the kernel stack via the sigaltstack function.

Which versions are affected by CVE-2009-2847?

It affects 2 products.

Products include Linux Kernel, Linux kernel.

How do I fix CVE-2009-2847?

Apply the vendor's patch.

Is CVE-2009-2847 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-2847 exists.

Public exploit code: 1 Exploit-DB entry.

All Linux kernel vulnerabilities

Sources

Also known as GHSA-c85v-8h9f-3jwr.