Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-68118

Vulnerability identifier: #VU142212

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-68118

CWE-ID: CWE-670

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of reset packets in tcp_check_req() when processing in-window RST segments in the SYN-RECEIVED request-socket path. A remote attacker can send a specially crafted non-exact RST packet to cause a denial of service.

The issue affects connection handling before a connection is fully established.

Linux kernel
Debian Linux
openEuler
kernel-headers
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-extra-modules
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-headers - update to 6.6.0-145.3.31.162
python3-perf-debuginfo - update to 6.6.0-145.3.31.162
python3-perf - update to 6.6.0-145.3.31.162
perf-debuginfo - update to 6.6.0-145.3.31.162
perf - update to 6.6.0-145.3.31.162
kernel-tools-devel - update to 6.6.0-145.3.31.162
kernel-tools-debuginfo - update to 6.6.0-145.3.31.162
kernel-tools - update to 6.6.0-145.3.31.162
kernel-source - update to 6.6.0-145.3.31.162
kernel-extra-modules - update to 6.6.0-145.3.31.162
kernel-devel - update to 6.6.0-145.3.31.162
kernel-debugsource - update to 6.6.0-145.3.31.162
kernel-debuginfo - update to 6.6.0-145.3.31.162
bpftool-debuginfo - update to 6.6.0-145.3.31.162
bpftool - update to 6.6.0-145.3.31.162
kernel - update to 6.6.0-145.3.31.162
linux (Debian package) - update to 6.12.105-1

• https://git.kernel.org/stable/c/22cec809b048495310f206d9abbcdbbfbdce3ae3
• https://git.kernel.org/stable/c/234f9ffbd9b2c1b24ec67200ea3cff07401bec48
• https://git.kernel.org/stable/c/a28c4fcbf774e23b4779cae468e3497a5ad1f4a1

• Always-Incorrect Control Flow Implementation in Linux kernel ipv4
• Debian update for linux
• openEuler 24.03 LTS SP3 update for kernel