CVE - CVE-2021-47243

CVE-ID
CVE-2021-47243	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/3371392c60e2685af30bd4547badd880f5df2b3f URL:https://git.kernel.org/stable/c/3371392c60e2685af30bd4547badd880f5df2b3f MISC:https://git.kernel.org/stable/c/3b491dd593d582ceeb27aa617600712a6bd14246 URL:https://git.kernel.org/stable/c/3b491dd593d582ceeb27aa617600712a6bd14246 MISC:https://git.kernel.org/stable/c/4cefa061fc63f4d2dff5ab4083f43857cd7a2335 URL:https://git.kernel.org/stable/c/4cefa061fc63f4d2dff5ab4083f43857cd7a2335 MISC:https://git.kernel.org/stable/c/595897ef118d6fe66690c4fc5b572028c9da95b7 URL:https://git.kernel.org/stable/c/595897ef118d6fe66690c4fc5b572028c9da95b7 MISC:https://git.kernel.org/stable/c/ba91c49dedbde758ba0b72f57ac90b06ddf8e548 URL:https://git.kernel.org/stable/c/ba91c49dedbde758ba0b72f57ac90b06ddf8e548
Assigning CNA
kernel.org
Date Record Created
20240410	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240410)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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