Vulnerability-Lookup

GHSA-W63R-7CFM-VM57

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31

Details

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

ksmbd: fix durable reconnect error path file lifetime

After a durable reconnect succeeds, ksmbd_reopen_durable_fd() republishes the same ksmbd_file into the session volatile-id table. If smb2_open() then takes a later error path, cleanup first calls ksmbd_fd_put(work, fp) and then unconditionally calls ksmbd_put_durable_fd(dh_info.fp).

In this case fp and dh_info.fp are the same object. The first put drops the reconnect lookup reference, but the final durable put can run __ksmbd_close_fd(NULL, fp). Because the final close is not session-aware, it can free the file object without removing the volatile-id entry that was just published into the session table.

Use the session-aware put for the final reconnect drop when the reconnect had already succeeded and the error path is cleaning up the republished file. Earlier reconnect failures, before fp is assigned to dh_info.fp, keep using the durable-only put path.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64016"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:41Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix durable reconnect error path file lifetime\n\nAfter a durable reconnect succeeds, ksmbd_reopen_durable_fd() republishes\nthe same ksmbd_file into the session volatile-id table. If smb2_open()\nthen takes a later error path, cleanup first calls ksmbd_fd_put(work, fp)\nand then unconditionally calls ksmbd_put_durable_fd(dh_info.fp).\n\nIn this case fp and dh_info.fp are the same object. The first put drops the\nreconnect lookup reference, but the final durable put can run\n__ksmbd_close_fd(NULL, fp). Because the final close is not session-aware,\nit can free the file object without removing the volatile-id entry that was\njust published into the session table.\n\nUse the session-aware put for the final reconnect drop when the reconnect\nhad already succeeded and the error path is cleaning up the republished\nfile. Earlier reconnect failures, before fp is assigned to dh_info.fp, keep\nusing the durable-only put path.",
  "id": "GHSA-w63r-7cfm-vm57",
  "modified": "2026-07-20T15:31:55Z",
  "published": "2026-07-19T18:31:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64016"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3515503322f4819277091839eed46b695096aca5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6cb0b9385320110fe24a5d5ac0000ade4bb3a3f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1a39f227c80cbf369767badc32cba2b225147d1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-64016 (GCVE-0-2026-64016)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-20 13:42

Title

ksmbd: fix durable reconnect error path file lifetime

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix durable reconnect error path file lifetime After a durable reconnect succeeds, ksmbd_reopen_durable_fd() republishes the same ksmbd_file into the session volatile-id table. If smb2_open() then takes a later error path, cleanup first calls ksmbd_fd_put(work, fp) and then unconditionally calls ksmbd_put_durable_fd(dh_info.fp). In this case fp and dh_info.fp are the same object. The first put drops the reconnect lookup reference, but the final durable put can run __ksmbd_close_fd(NULL, fp). Because the final close is not session-aware, it can free the file object without removing the volatile-id entry that was just published into the session table. Use the session-aware put for the final reconnect drop when the reconnect had already succeeded and the error path is cleaning up the republished file. Earlier reconnect failures, before fp is assigned to dh_info.fp, keep using the durable-only put path.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/a1a39f227c80cbf36…
https://git.kernel.org/stable/c/6cb0b9385320110fe…
https://git.kernel.org/stable/c/3515503322f481927…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ce2e164c1c51c3f7813b80f8c926836e896bcbb3 , < a1a39f227c80cbf369767badc32cba2b225147d1 (git) Affected: 97a0cd55283b4e63fd92804da91c8d9896adcad9 , < 6cb0b9385320110fe24a5d5ac0000ade4bb3a3f3 (git) Affected: 1baff47b81f94f9231c91236aa511420d0e266b9 , < 3515503322f4819277091839eed46b695096aca5 (git)
Linux	Linux	Affected: 6.18.33 , < 6.18.34 (semver) Affected: 7.0.10 , < 7.0.11 (semver)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a1a39f227c80cbf369767badc32cba2b225147d1",
              "status": "affected",
              "version": "ce2e164c1c51c3f7813b80f8c926836e896bcbb3",
              "versionType": "git"
            },
            {
              "lessThan": "6cb0b9385320110fe24a5d5ac0000ade4bb3a3f3",
              "status": "affected",
              "version": "97a0cd55283b4e63fd92804da91c8d9896adcad9",
              "versionType": "git"
            },
            {
              "lessThan": "3515503322f4819277091839eed46b695096aca5",
              "status": "affected",
              "version": "1baff47b81f94f9231c91236aa511420d0e266b9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6.18.34",
              "status": "affected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThan": "7.0.11",
              "status": "affected",
              "version": "7.0.10",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "6.18.33",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "7.0.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix durable reconnect error path file lifetime\n\nAfter a durable reconnect succeeds, ksmbd_reopen_durable_fd() republishes\nthe same ksmbd_file into the session volatile-id table. If smb2_open()\nthen takes a later error path, cleanup first calls ksmbd_fd_put(work, fp)\nand then unconditionally calls ksmbd_put_durable_fd(dh_info.fp).\n\nIn this case fp and dh_info.fp are the same object. The first put drops the\nreconnect lookup reference, but the final durable put can run\n__ksmbd_close_fd(NULL, fp). Because the final close is not session-aware,\nit can free the file object without removing the volatile-id entry that was\njust published into the session table.\n\nUse the session-aware put for the final reconnect drop when the reconnect\nhad already succeeded and the error path is cleaning up the republished\nfile. Earlier reconnect failures, before fp is assigned to dh_info.fp, keep\nusing the durable-only put path."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:42:24.006Z",
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        },
        {
          "url": "https://git.kernel.org/stable/c/3515503322f4819277091839eed46b695096aca5"
        }
      ],
      "title": "ksmbd: fix durable reconnect error path file lifetime",
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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64016",
    "datePublished": "2026-07-19T15:39:11.266Z",
    "dateReserved": "2026-07-19T07:54:57.027Z",
    "dateUpdated": "2026-07-20T13:42:24.006Z",
    "state": "PUBLISHED"
  },
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}

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.

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GHSA-W63R-7CFM-VM57

CVE-2026-64016 (GCVE-0-2026-64016)

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Nomenclature