CVE Catalog

CVE-2026-68130

Low risk· EPSS 12%
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.22%

12th percentile - higher than 12% of all known CVEs

Summary

In the Linux kernel ksmbd module, destroy_previous_session() is called before NTLMv2 validation, allowing an authenticated attacker to destroy another user's session. The fix moves the call after validation and uses the verified user.

Risk Assessment

An authenticated attacker can disrupt other users' sessions, causing denial of service and potential session hijacking.

Recommendation

Install the Linux kernel update with the fix for CVE-2026-68130. Restrict access to ksmbd services to trusted users only.

Other vulnerabilities in Linux kernel

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Original NVD description (English source)

In the Linux kernel, the following vulnerability has been resolved: ksmbd: defer destroy_previous_session() until after NTLM authentication In ntlm_authenticate(), destroy_previous_session() is called using a user pointer resolved from the client-supplied NTLM blob username field before the NTLMv2 response is validated. An authenticated attacker can set the NTLM blob username to match a victim account and set PreviousSessionId to the victim's session ID; destroy_previous_session() destroys the victim's session while ksmbd_decode_ntlmssp_auth_blob() subsequently rejects the request with -EPERM. Move destroy_previous_session() and the prev_id assignment to after ksmbd_decode_ntlmssp_auth_blob() returns success and use sess->user rather than the pre-authentication lookup result. This matches the ordering already used by krb5_authenticate(), where destroy_previous_session() is called only after ksmbd_krb5_authenticate() returns success.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS