Bug 2541112 (CVE-2026-97523) - CVE-2026-97523 kernel: mptcp: close race between scheduler and state change
Summary: CVE-2026-97523 kernel: mptcp: close race between scheduler and state change
Keywords:
Status: NEW
Alias: CVE-2026-97523
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: 2026-09-25 10:49 UTC by OSIDB Bzimport
Modified: 2026-09-28 18:28 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-09-25 10:49:28 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mptcp: close race between scheduler and state change

The mptcp scheduler may race with subflow sockets state change: data
transmission on the selected socket may fail and a later release could
try to use mss_now reset to 0 for a divide operation.

Address the issue by explicitly checking for the critical scenario.
Comment 1 gkamathe 2026-09-28 18:22:31 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97523.mbox
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