CVE-2026-90169

In the Linux kernel, the following vulnerability has been resolved: ksmbd: free preauth sessions on connection teardown SMB3.1.1 multichannel binding preserves the preauthentication hash in a preauth_session between the NTLM negotiate and authenticate requests. The binding NTLM negotiate allocates this object and returns STATUS_MORE_PROCESSING_REQUIRED. If the client disconnects before it sends the authenticate request, neither the authenticate nor error cleanup paths free the object. Release any remaining preauthentication sessions when tearing down the connection. Initialize the list when allocating the connection so that this cleanup is safe regardless of the negotiated dialect.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/06c7b1d731bc105a8644f1b70165ba8b9416cbab
https://git.kernel.org/stable/c/8e2ebc77678832e981adc008d25cd8f67d08ebc4
https://git.kernel.org/stable/c/a41a98ee16ae038751b6639decadaa3ce15ca18a
https://git.kernel.org/stable/c/b62b1ebb25f0a19067ed5b1a86036b2dc98be44f
https://git.kernel.org/stable/c/effcf48d79d8aa53113d8289e140746f25ceb62c

Configurations

No configuration.

History

17 Sep 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-17 17:17

Updated : 2026-09-17 17:17

NVD link : CVE-2026-90169

Mitre link : CVE-2026-90169

CVE.ORG link : CVE-2026-90169

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-90169", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "f5a544e3bab78142207e0242d22442db85ba1eff", "lessThan": "effcf48d79d8aa53113d8289e140746f25ceb62c", "versionType": "git"}, {"status": "affected", "version": "f5a544e3bab78142207e0242d22442db85ba1eff", "lessThan": "b62b1ebb25f0a19067ed5b1a86036b2dc98be44f", "versionType": "git"}, {"status": "affected", "version": "f5a544e3bab78142207e0242d22442db85ba1eff", "lessThan": "a41a98ee16ae038751b6639decadaa3ce15ca18a", "versionType": "git"}, {"status": "affected", "version": "f5a544e3bab78142207e0242d22442db85ba1eff", "lessThan": "8e2ebc77678832e981adc008d25cd8f67d08ebc4", "versionType": "git"}, {"status": "affected", "version": "f5a544e3bab78142207e0242d22442db85ba1eff", "lessThan": "06c7b1d731bc105a8644f1b70165ba8b9416cbab", "versionType": "git"}], "programFiles": ["fs/smb/server/connection.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/mgmt/user_session.h", "fs/smb/server/smb2ops.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"status": "unaffected", "version": "0", "lessThan": "5.15", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.110", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.52", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.6", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/server/connection.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/mgmt/user_session.h", "fs/smb/server/smb2ops.c"], "defaultStatus": "affected"}]}], "published": "2026-09-17T17:17:10.333", "references": [{"url": "https://git.kernel.org/stable/c/06c7b1d731bc105a8644f1b70165ba8b9416cbab", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8e2ebc77678832e981adc008d25cd8f67d08ebc4", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a41a98ee16ae038751b6639decadaa3ce15ca18a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b62b1ebb25f0a19067ed5b1a86036b2dc98be44f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/effcf48d79d8aa53113d8289e140746f25ceb62c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: free preauth sessions on connection teardown\n\nSMB3.1.1 multichannel binding preserves the preauthentication hash in a\npreauth_session between the NTLM negotiate and authenticate requests.\nThe binding NTLM negotiate allocates this object and returns\nSTATUS_MORE_PROCESSING_REQUIRED. If the client disconnects before it sends\nthe authenticate request, neither the authenticate nor error cleanup paths\nfree the object.\n\nRelease any remaining preauthentication sessions when tearing down the\nconnection. Initialize the list when allocating the connection so that this\ncleanup is safe regardless of the negotiated dialect."}], "lastModified": "2026-09-17T17:17:10.333", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}