Improper access control in Linux kernel - CVE-2026-68130

Vulnerability identifier: #VU142177

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-68130

CWE-ID: CWE-284

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper access control in ntlm_authenticate() when processing an NTLM authentication request containing a crafted username field and PreviousSessionId. A remote user can supply a username matching a victim account and a victim session identifier to cause a denial of service.

The issue can destroy another user's SMB session before the NTLMv2 response is validated.

Linux kernel
openEuler
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-headers
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 5.10.0-329.0.0.230
bpftool - update to 5.10.0-329.0.0.230
bpftool-debuginfo - update to 5.10.0-329.0.0.230
kernel-debuginfo - update to 5.10.0-329.0.0.230
kernel-debugsource - update to 5.10.0-329.0.0.230
kernel-devel - update to 5.10.0-329.0.0.230
kernel-headers - update to 5.10.0-329.0.0.230
kernel-source - update to 5.10.0-329.0.0.230
kernel-tools - update to 5.10.0-329.0.0.230
kernel-tools-debuginfo - update to 5.10.0-329.0.0.230
kernel-tools-devel - update to 5.10.0-329.0.0.230
perf - update to 5.10.0-329.0.0.230
perf-debuginfo - update to 5.10.0-329.0.0.230
python3-perf - update to 5.10.0-329.0.0.230
python3-perf-debuginfo - update to 5.10.0-329.0.0.230

• https://git.kernel.org/stable/c/0ff12308c8a6c16ab68f0a487ffa93d69001dc18
• https://git.kernel.org/stable/c/18705cace0619fd2123737dcd028147774f38181
• https://git.kernel.org/stable/c/243f1614ef2aca2d62a744575f1c24b07cd42757
• https://git.kernel.org/stable/c/5c833074b549e5db125436a6f681af682261f785
• https://git.kernel.org/stable/c/c74801ee524f477c174a1899782b6c3b6918d407

• Improper access control in Linux kernel smb server
• openEuler 22.03 LTS SP4 update for kernel