What’s Vulnerable › Vulnerabilities

CVE-2023-49062

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-28 · updated 2026-06-17
• Weakness: CWE-665

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

Affected products

• Facebook Katran: before 2023-11-15 — fixed in 2023-11-15

How to fix

Upgrade to a fixed version: Facebook Katran 2023-11-15. Check the vendor advisory for mitigations.

References

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

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