CVE-2021-47245: netfilter: synproxy: Fix out of bounds when parsing TCP options

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-21 · updated 2026-08-04
Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: synproxy: Fix out of bounds when parsing TCP options The TCP option parser in synproxy (synproxy_parse_options) could read one byte out of bounds. When the length is 1, the execution flow gets into the loop, reads one byte of the opcode, and if the opcode is neither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the length of 1. This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack out of bounds when parsing TCP options."). v2 changes: Added an early return when length < 0 to avoid calling skb_header_pointer with negative length.

Affected products

Linux kernel: from 3.12 before 4.4.274; from 4.5 before 4.9.274; from 4.10 before 4.14.238; from 4.15 before 4.19.196; from 4.20 before 5.4.128; from 5.5 before 5.10.46 — fixed in 4.14.238, 4.19.196, 4.4.274, 4.9.274, 5.10.46, 5.12.13

How to fix

Upgrade to a fixed version: Linux kernel 4.14.238, 4.19.196, 4.4.274, 4.9.274. Check the vendor advisory for mitigations.

References

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