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HighFix available

ksmbd: safely drain sessions during logoff

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: ksmbd: safely drain sessions during logoff SMB3 multichannel allows requests for one session to run on multiple connections. Wait for all channels bound to a session before freeing shared session objects. A deferred byte-range lock remains counted as a running request and only wakes when its file closes. Wake blocked locks during the drain without unpublishing or modifying their file objects. Synchronous CANCEL requests must invoke their cancellation callback to wake pending operations, while CHANGE_NOTIFY completion remains specific to the asynchronous path. Serialize session teardown with channel registration and previous-session cleanup, and use atomic work-state transitions so LOGOFF, CANCEL, and connection teardown invoke cancellation callbacks only once.

Products
Kernel
Affected versions
Not specified
Fixed versions
7.2.7
CVEs
CVE-2026-98115
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 08:27 UTC · Revision 1

Source evidence

ksmbd: safely drain sessions during logoff

core-osv · Original source

Published 25 Sept 2026, 10:36 UTC

In the Linux kernel, the following vulnerability has been resolved: ksmbd: safely drain sessions during logoff SMB3 multichannel allows requests for one session to run on multiple connections. Wait for all channels bound to a session before freeing shared session objects. A deferred byte-range lock remains counted as a running request and only wakes when its file closes. Wake blocked locks during the drain without unpublishing or modifying their file objects. Synchronous CANCEL requests must invoke their cancellation callback to wake pending operations, while CHANGE_NOTIFY completion remains specific to the asynchronous path. Serialize session teardown with channel registration and previous-session cleanup, and use atomic work-state transitions so LOGOFF, CANCEL, and connection teardown invoke cancellation callbacks only once.

osv:CVE-2026-98115

Kernel

Fixed versions: 7.2.7

Complete source record
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  "url": "https://osv.dev/vulnerability/CVE-2026-98115",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ksmbd: safely drain sessions during logoff",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ksmbd: safely drain sessions during logoff SMB3 multichannel allows requests for one session to run on multiple connections. Wait for all channels bound to a session before freeing shared session objects. A deferred byte-range lock remains counted as a running request and only wakes when its file closes. Wake blocked locks during the drain without unpublishing or modifying their file objects. Synchronous CANCEL requests must invoke their cancellation callback to wake pending operations, while CHANGE_NOTIFY completion remains specific to the asynchronous path. Serialize session teardown with channel registration and previous-session cleanup, and use atomic work-state transitions so LOGOFF, CANCEL, and connection teardown invoke cancellation callbacks only once.",
    "evidence": "osv:CVE-2026-98115",
    "products": [
      {
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          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
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      "metrics": [
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          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "6.11.0"
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98115.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.806141518Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/a7e6df0bb92642bee4431b2b85c69ada1e463b21",
        "https://git.kernel.org/stable/c/d12168084c8c1b6d883c8eca5853929ac5136a9e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98115.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98115",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98115.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98115",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501126,
  "published_at": "2026-09-25T10:36:01.119+00:00"
}