CVE-2021-47245 (GCVE-0-2021-47245)
Vulnerability from cvelistv5
Published
2024-05-21 14:19
Modified
2025-05-04 07:07
Severity ?
Summary
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
Impacted products
Vendor Product Version
Linux Linux Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
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