CVE-2026-97568

mptcp: syncookies: remember the request backup flag

CVE-2026-97568 is fixed in 95 products on 1 platform, first by DEBIAN-CVE-2026-97568, released September 29, 2026. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
7.1
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0022
12th percentile

In the Linux kernel, the following vulnerability has been resolved: mptcp: syncookies: remember the request backup flag Instead of using an uninitialised bit when copying the info in subflow_ulp_clone(). To fix this, no need to extend the join_entry structure: backup is coming from struct mptcp_subflow_request_sock, only one bit. Do the same here by using one bit for both.

Where it's fixed

ProductFixed inFixReleased
Linux
bpftool · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
bpftool · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
bpftool · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
bpftool-debuginfo · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
bpftool6.12 · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
bpftool6.12-debuginfo · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
bpftool6.18 · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
bpftool6.18-debuginfo · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-debuginfo · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-debuginfo-common-aarch64 · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-debuginfo-common-x86_64 · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-devel · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-headers · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-livepatch-6.1.189-236.399 · amzn 2023 1:1.0-0.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-livepatch-6.12.111-136.204 · amzn 2023 1:1.0-0.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel-livepatch-6.18.54-121.166 · amzn 2023 1:1.0-0.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel-modules-extra · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-modules-extra-common · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-tools · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-tools-debuginfo · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-tools-devel · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
kernel-uek · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-container · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-container · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-container-debug · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-container-debug · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-core · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-core · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-core · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-core · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-debug · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-debug · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-core · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-core · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-debug-core · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-debug-core · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-devel · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-devel · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-debug-devel · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-debug-devel · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-debug-modules · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-debug-modules · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-core · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-core · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-deprecated · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-deprecated · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-desktop · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-desktop · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-extra · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-extra · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-debug-modules-extra · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-debug-modules-extra · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-extra-netfilter · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-extra-netfilter · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-usb · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-usb · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-wireless · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-debug-modules-wireless · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-devel · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-devel · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-devel · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-devel · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-doc · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-doc · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-doc · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-doc · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-modules · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-modules · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-core · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-core · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-deprecated · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-deprecated · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-desktop · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-desktop · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-extra · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-extra · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-modules-extra · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek-modules-extra · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-extra-netfilter · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-extra-netfilter · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-usb · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-usb · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-wireless · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-modules-wireless · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-tools · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek-tools · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek64k · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek64k · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-core · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-core · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek64k-core · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek64k-core · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-devel · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-devel · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek64k-devel · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek64k-devel · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek64k-modules · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek64k-modules · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-core · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-core · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-deprecated · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-deprecated · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-desktop · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-desktop · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-extra · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-extra · ol 8 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek64k-modules-extra · ol 9 0:5.15.0-326.222.4.el9uek ELSA-2026-500574 Nov 7, 2026
kernel-uek64k-modules-extra · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-extra-netfilter · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-extra-netfilter · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-usb · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-usb · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-wireless · ol 10 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel-uek64k-modules-wireless · ol 9 0:6.12.0-207.111.5.1.el9uek ELSA-2026-500374 Oct 7, 2026
kernel6.12 · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel6.12-debuginfo · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel6.12-debuginfo-common-aarch64 · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel6.12-debuginfo-common-x86_64 · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel6.12-devel · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel6.12-headers · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel6.12-modules-extra · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel6.12-modules-extra-common · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel6.12-tools · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel6.12-tools-debuginfo · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel6.12-tools-devel · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
kernel6.18 · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel6.18-debuginfo · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel6.18-debuginfo-common-aarch64 · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel6.18-debuginfo-common-x86_64 · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel6.18-devel · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel6.18-headers · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel6.18-modules-extra · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel6.18-modules-extra-common · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel6.18-tools · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel6.18-tools-debuginfo · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
kernel6.18-tools-devel · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
linux · Debian 12.15 (bookworm) 6.1.190-1 DEBIAN-CVE-2026-97568 Sep 29, 2026
linux · Debian 13.5 (trixie) 6.12.111-1 DEBIAN-CVE-2026-97568 Sep 29, 2026
linux · Debian 14 7.2.7-1 DEBIAN-CVE-2026-97568 Sep 29, 2026
linux-6.12 · Debian 12.15 (bookworm) 6.12.111-1~deb12u1 DEBIAN-CVE-2026-97568 Sep 29, 2026
microvm-kernel · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
microvm-kernel6.18 · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
perf · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
perf-debuginfo · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
perf6.12 · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
perf6.12-debuginfo · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
perf6.18 · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
perf6.18-debuginfo · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
python3-perf · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
python3-perf-debuginfo · amzn 2023 1:6.1.189-236.399.amzn2023 ALAS2023-2026-3336 Nov 7, 2026
python3-perf6.12 · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
python3-perf6.12-debuginfo · amzn 2023 1:6.12.111-136.204.amzn2023 ALAS2023-2026-3193 Nov 7, 2026
python3-perf6.18 · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026
python3-perf6.18-debuginfo · amzn 2023 1:6.18.54-121.166.amzn2023 ALAS2023-2026-3192 Nov 7, 2026

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