CVE-2026-68130
Description
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.
How to fix
- Linux Linuxab0230257ebdf48b07eaa679a8c92bc842fe3498, 370b0ec8822b69c9073265e16b7daaa8201c9a4f, 5c833074b549e5db125436a6f681af682261f785, 243f1614ef2aca2d62a744575f1c24b07cd42757, 18705cace0619fd2123737dcd028147774f38181, 0ff12308c8a6c16ab68f0a487ffa93d69001dc18, c74801ee524f477c174a1899782b6c3b6918d407 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < ab0230257ebdf48b07eaa679a8c92bc842fe3498, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < 370b0ec8822b69c9073265e16b7daaa8201c9a4f, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < 5c833074b549e5db125436a6f681af682261f785, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < 243f1614ef2aca2d62a744575f1c24b07cd42757, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < 18705cace0619fd2123737dcd028147774f38181, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < 0ff12308c8a6c16ab68f0a487ffa93d69001dc18, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < c74801ee524f477c174a1899782b6c3b6918d407, 5.15 | ab0230257ebdf48b07eaa679a8c92bc842fe3498, 370b0ec8822b69c9073265e16b7daaa8201c9a4f, 5c833074b549e5db125436a6f681af682261f785, 243f1614ef2aca2d62a744575f1c24b07cd42757, 18705cace0619fd2123737dcd028147774f38181, 0ff12308c8a6c16ab68f0a487ffa93d69001dc18, c74801ee524f477c174a1899782b6c3b6918d407 |
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