CVE-2026-98438
kernel: mptcp: options: fix uninit-value in mptcp_write_data_fin
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 18, 2026
Updated · October 19, 2026
Description
A flaw was found in the Linux kernel's Multipath TCP (MPTCP) subsystem. When handling connection termination (DATA_FIN) packets without payload data while checksum negotiation is enabled, the kernel fails to properly initialize memory before computing the packet checksum. A network peer could trigger this condition during connection teardown, resulting in corrupted packet headers, dropped packets, or a denial of service.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE-908 · Use of Uninitialized Resource