Vulnerability-Lookup

CVE-2026-52911 (GCVE-0-2026-52911)

Vulnerability from cvelistv5 – Published: 2026-06-21 06:18 – Updated: 2026-06-21 06:18

Title

ksmbd: scope conn->binding slowpath to bound sessions only

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: scope conn->binding slowpath to bound sessions only When the binding SESSION_SETUP sets conn->binding = true, the flag stays set after the call so that the global session lookup in ksmbd_session_lookup_all() can find the session, which was not added to conn->sessions. Because the flag is connection-wide, the global lookup path will also resolve any other session by id if asked. Tighten the global lookup so that the returned session must have this connection registered in its channel xarray (sess->ksmbd_chann_list). The channel entry is installed by the existing binding_session path in ntlm_authenticate()/krb5_authenticate() when a SESSION_SETUP completes successfully, so this condition is a strict equivalent of "this connection has been accepted as a channel of this session". Connections that have not bound to a given session cannot reach it via the global table. The existing conn->binding gate for entering the slowpath is preserved so that non-binding connections keep the fast-path-only behavior, and the session->state check is unchanged.

Severity

No CVSS data available.

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/e74c00c6af428a39e…
https://git.kernel.org/stable/c/e3a93ce6e25757b8f…
https://git.kernel.org/stable/c/1ff46c9915c1cbf45…
https://git.kernel.org/stable/c/974c1c224e85549dc…
https://git.kernel.org/stable/c/2cc8a4db633b10715…
https://git.kernel.org/stable/c/1e2bec062c5c9ec28…
https://git.kernel.org/stable/c/b0da97c034b6107d1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < e74c00c6af428a39e564cdc5bd3a3648c6d8de87 (git) Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < e3a93ce6e25757b8f375e38b8f91e1d9da4edc1a (git) Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < 1ff46c9915c1cbf454db58a8cb87f7cac818e6a6 (git) Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < 974c1c224e85549dc3459f3bb2255bbbdd2b9372 (git) Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < 2cc8a4db633b10715450b291c1343859a4b2c509 (git) Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < 1e2bec062c5c9ec282636715166056d0998d746d (git) Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < b0da97c034b6107d14e537e212d4ce8b22109a58 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/user_session.c"
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: scope conn-\u003ebinding slowpath to bound sessions only\n\nWhen the binding SESSION_SETUP sets conn-\u003ebinding = true, the flag stays\nset after the call so that the global session lookup in\nksmbd_session_lookup_all() can find the session, which was not added to\nconn-\u003esessions. Because the flag is connection-wide, the global lookup\npath will also resolve any other session by id if asked.\n\nTighten the global lookup so that the returned session must have this\nconnection registered in its channel xarray (sess-\u003eksmbd_chann_list).\nThe channel entry is installed by the existing binding_session path in\nntlm_authenticate()/krb5_authenticate() when a SESSION_SETUP completes\nsuccessfully, so this condition is a strict equivalent of \"this\nconnection has been accepted as a channel of this session\". Connections\nthat have not bound to a given session cannot reach it via the global\ntable.\n\nThe existing conn-\u003ebinding gate for entering the slowpath is preserved\nso that non-binding connections keep the fast-path-only behavior, and\nthe session-\u003estate check is unchanged."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-21T06:18:49.342Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/e3a93ce6e25757b8f375e38b8f91e1d9da4edc1a"
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        {
          "url": "https://git.kernel.org/stable/c/b0da97c034b6107d14e537e212d4ce8b22109a58"
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      ],
      "title": "ksmbd: scope conn-\u003ebinding slowpath to bound sessions only",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52911",
    "datePublished": "2026-06-21T06:18:49.342Z",
    "dateReserved": "2026-06-09T07:44:35.366Z",
    "dateUpdated": "2026-06-21T06:18:49.342Z",
    "state": "PUBLISHED"
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}

GHSA-593M-GQ54-R4VQ

Vulnerability from github – Published: 2026-06-21 09:30 – Updated: 2026-06-21 09:30

Details

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: scope conn->binding slowpath to bound sessions only

When the binding SESSION_SETUP sets conn->binding = true, the flag stays set after the call so that the global session lookup in ksmbd_session_lookup_all() can find the session, which was not added to conn->sessions. Because the flag is connection-wide, the global lookup path will also resolve any other session by id if asked.

Tighten the global lookup so that the returned session must have this connection registered in its channel xarray (sess->ksmbd_chann_list). The channel entry is installed by the existing binding_session path in ntlm_authenticate()/krb5_authenticate() when a SESSION_SETUP completes successfully, so this condition is a strict equivalent of "this connection has been accepted as a channel of this session". Connections that have not bound to a given session cannot reach it via the global table.

The existing conn->binding gate for entering the slowpath is preserved so that non-binding connections keep the fast-path-only behavior, and the session->state check is unchanged.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-52911"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-21T08:16:23Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: scope conn-\u003ebinding slowpath to bound sessions only\n\nWhen the binding SESSION_SETUP sets conn-\u003ebinding = true, the flag stays\nset after the call so that the global session lookup in\nksmbd_session_lookup_all() can find the session, which was not added to\nconn-\u003esessions. Because the flag is connection-wide, the global lookup\npath will also resolve any other session by id if asked.\n\nTighten the global lookup so that the returned session must have this\nconnection registered in its channel xarray (sess-\u003eksmbd_chann_list).\nThe channel entry is installed by the existing binding_session path in\nntlm_authenticate()/krb5_authenticate() when a SESSION_SETUP completes\nsuccessfully, so this condition is a strict equivalent of \"this\nconnection has been accepted as a channel of this session\". Connections\nthat have not bound to a given session cannot reach it via the global\ntable.\n\nThe existing conn-\u003ebinding gate for entering the slowpath is preserved\nso that non-binding connections keep the fast-path-only behavior, and\nthe session-\u003estate check is unchanged.",
  "id": "GHSA-593m-gq54-r4vq",
  "modified": "2026-06-21T09:30:51Z",
  "published": "2026-06-21T09:30:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52911"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1e2bec062c5c9ec282636715166056d0998d746d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ff46c9915c1cbf454db58a8cb87f7cac818e6a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2cc8a4db633b10715450b291c1343859a4b2c509"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/974c1c224e85549dc3459f3bb2255bbbdd2b9372"
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    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b0da97c034b6107d14e537e212d4ce8b22109a58"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3a93ce6e25757b8f375e38b8f91e1d9da4edc1a"
    },
    {
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      "url": "https://git.kernel.org/stable/c/e74c00c6af428a39e564cdc5bd3a3648c6d8de87"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-52911 (GCVE-0-2026-52911)

GHSA-593M-GQ54-R4VQ

Tags

Sightings

Nomenclature