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redhatcveRedhat.comRH:CVE-2021-47245
HistoryMay 23, 2024 - 2:03 p.m.

CVE-2021-47245

2024-05-2314:03:18
redhat.com
access.redhat.com
3
linux kernel
netfilter
synproxy
tcp options
out of bounds
vulnerability

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%

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.

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%