Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.19, < 4.19.196 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/3371392c60e2685af30bd4547badd880f5df2b3fPatch
- https://git.kernel.org/stable/c/3b491dd593d582ceeb27aa617600712a6bd14246Patch
- https://git.kernel.org/stable/c/4cefa061fc63f4d2dff5ab4083f43857cd7a2335Patch
- https://git.kernel.org/stable/c/595897ef118d6fe66690c4fc5b572028c9da95b7Patch
- https://git.kernel.org/stable/c/ba91c49dedbde758ba0b72f57ac90b06ddf8e548Patch
- https://git.kernel.org/stable/c/3371392c60e2685af30bd4547badd880f5df2b3fPatch
- https://git.kernel.org/stable/c/3b491dd593d582ceeb27aa617600712a6bd14246Patch
- https://git.kernel.org/stable/c/4cefa061fc63f4d2dff5ab4083f43857cd7a2335Patch
- https://git.kernel.org/stable/c/595897ef118d6fe66690c4fc5b572028c9da95b7Patch
- https://git.kernel.org/stable/c/ba91c49dedbde758ba0b72f57ac90b06ddf8e548Patch
FAQ
What is CVE-2021-47243?
CVE-2021-47243 is a vulnerability with a CVSS score of 7.1 (HIGH). 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...
How severe is CVE-2021-47243?
CVE-2021-47243 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47243?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.