CVE-2023-53839 Details
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.
A data-race vulnerability has been identified in the Linux kernel's Datagram Congestion Control Protocol (DCCP) implementation. This issue arises because the function 'dccp_sendmsg()' accesses the 'dccps_mss_cache' variable before the socket is locked, creating a potential race condition. A similar problem exists in the 'do_dccp_getsockopt()' function. The vulnerability affects the Linux kernel stable tree and has been addressed by adding 'READ_ONCE()' and 'WRITE_ONCE()' annotations to the relevant code. The 'dccp_sendmsg()' function has also been modified to recheck the 'dccps_mss_cache' after the socket is locked, ensuring proper synchronization.
Users can upgrade to the latest version of the Linux kernel stable tree, where this vulnerability has been fixed. Instructions for downloading the patched version are available on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Dec 9, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/162fa1e3cfb62aa780d7c40c8cccb6c2f8bef7c1 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/2bdc7f272b3a110a4e1fdee6c47c8d20f9b20817 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/67eebc7a9217f999b779d46fba5312a716f0dc1d | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/6d701c95ee6463abcbb6da543060d6e444554135 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/a47e598fbd8617967e49d85c49c22f9fc642704c | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/a6ddc1c774874dc704f96a99d015dc759627bba7 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/d1f38d313bdfc52fb2f662e66d0c60dd1cfe2384 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/f239c9e1d98b313435481b4926e8bdd06197e4d8 | kernel.org | Source CodeVendor |
Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
| Product | Versions |
|---|---|
| Linux kernel | All versions |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Dec 9, 2025 | New CVE Received | kernel.org |