What’s Vulnerable › Vulnerabilities

CVE-2022-50865: tcp: fix a signed-integer-overflow bug in tcp_add_backlog()

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: fix a signed-integer-overflow bug in tcp_add_backlog() The type of sk_rcvbuf and sk_sndbuf in struct sock is int, and in tcp_add_backlog(), the variable limit is caculated by adding sk_rcvbuf, sk_sndbuf and 64 * 1024, it may exceed the max value of int and overflow. This patch reduces the limit budget by halving the sndbuf to solve this issue since ACK packets are much smaller than the payload.

Affected products

• Linux kernel: 4.9 — fixed in 6.1

How to fix

Upgrade to a fixed version: Linux kernel 6.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/28addf029417d53b1df062b4c87feb7bc033cb5f
• https://git.kernel.org/stable/c/4f23cb2be530785db284a685d1b1c30224d8a538
• https://git.kernel.org/stable/c/9d04b4d0feee12bce6bfe37f30d8e953d3c30368
• https://git.kernel.org/stable/c/a85d39f14aa8a71e29cfb5eb5de02878a8779898
• https://git.kernel.org/stable/c/ec791d8149ff60c40ad2074af3b92a39c916a03f

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