Bug 2420328 (CVE-2023-53839) - CVE-2023-53839 kernel: dccp: fix data-race around dp->dccps_mss_cache
Summary: CVE-2023-53839 kernel: dccp: fix data-race around dp->dccps_mss_cache
Keywords:
Status: NEW
Alias: CVE-2023-53839
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-12-09 02:03 UTC by OSIDB Bzimport
Modified: 2025-12-12 09:47 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2025-12-09 02:03:14 UTC 
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.
Comment 1 Alexander B 2025-12-10 01:02:46 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120956-CVE-2023-53839-5f7e@gregkh/T
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