CVE-2009-2847

4.9 MEDIUM 0.9% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited locally on the machine without logging in. High risk of data exposure.
Exploit odds: 0.9% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2009-08-18 21:00 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:10 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.9% in the next 30 days (EPSS).
Severity: 4.9 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2009-08-18 21:00 UTC
Last modified: 2026-06-16 23:10 UTC
Exploit probability: 0.9% · EPSS, next 30 days
Record status: Modified

Affected

Linux Kernel 2.6.24.7
Linux Kernel 2.6.25.15
Linux Kernel ≤ 2.6.16.31
Linux Kernel 2.6
Linux Kernel 2.6.0
Linux Kernel 2.6.1
Linux Kernel 2.6.10
Linux Kernel 2.6.11

Attack profile CVSS 2.0 · 4.9

Attack vector: Local
Complexity: Low
Authentication: None
Confidentiality: Complete
Integrity: None
Availability: None

Raw vector

AV:L/AC:L/Au:N/C:C/I:N/A:N

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2009-2847.md and follow it. Check whether this project is affected by CVE-2009-2847. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record