CVE-2023-53839
Published Dec 9, 2025
Modified Apr 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: dccp: fix data-race around dp->dccps_mss_cache dccp_sendmsg() reads dp->dccps_mss_cache before locking the socket. Same thing in do_dccp_getsockopt(). Add READ_ONCE()/WRITE_ONCE() annotations, and change dccp_sendmsg() to check again dccps_mss_cache after socket is locked.
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References
Other References
https://git.kernel.org/stable/c/162fa1e3cfb62aa780d7c40c8cccb6c2f8bef7c1
https://git.kernel.org/stable/c/2bdc7f272b3a110a4e1fdee6c47c8d20f9b20817
https://git.kernel.org/stable/c/67eebc7a9217f999b779d46fba5312a716f0dc1d
https://git.kernel.org/stable/c/6d701c95ee6463abcbb6da543060d6e444554135
https://git.kernel.org/stable/c/a47e598fbd8617967e49d85c49c22f9fc642704c
https://git.kernel.org/stable/c/a6ddc1c774874dc704f96a99d015dc759627bba7
https://git.kernel.org/stable/c/d1f38d313bdfc52fb2f662e66d0c60dd1cfe2384
https://git.kernel.org/stable/c/f239c9e1d98b313435481b4926e8bdd06197e4d8
Frequently Asked Questions
What is CVE-2023-53839? +
In the Linux kernel, the following vulnerability has been resolved:
dccp: fix data-race around dp->dccps_mss_cache
dccp_sendmsg() reads dp->dccps_mss_cache before locking the socket.
Same thing in do_dccp_getsockopt().
Add READ_ONCE()/WRITE_ONCE() annotations,
and change dccp_sendmsg() to check again dccps_mss_cache
after socket is locked.
How do I check if I'm vulnerable to CVE-2023-53839? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.