Detections
Analytics
CVE-2021-47245
medium
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.
References
https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b
https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8
https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02
https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b
https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98
https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1
https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915
https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4