Shodan
Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2021-47243

In the Linux kernel, the following vulnerability has been resolved: sch_cake: Fix out of bounds when parsing TCP options and header The TCP option parser in cake qdisc (cake_get_tcpopt and cake_tcph_may_drop) 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 doff validation in cake_get_tcphdr to avoid parsing garbage as TCP header. Although it wasn't strictly an out-of-bounds access (memory was allocated), garbage values could be read where CAKE expected the TCP header if doff was smaller than 5.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 31.1%
CVSS Severity
CVSS v3 Score 7.1
Products affected by CVE-2021-47243


Products
Pricing
Contact Us

Shodan ® - All rights reserved