Vulnerability-Lookup

CVE-2026-64401 (GCVE-0-2026-64401)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50

Title

smb: client: resolve SWN tcon from live registrations

Summary

In the Linux kernel, the following vulnerability has been resolved: smb: client: resolve SWN tcon from live registrations cifs_swn_notify() looks up a witness registration by id under cifs_swnreg_idr_mutex, drops the mutex, and then uses the registration's cached tcon pointer. That pointer is not a lifetime reference, and it is not a stable representative once cifs_get_swn_reg() lets multiple tcons for the same net/share name share one registration id. A same-share second mount can keep the cifs_swn_reg alive after the first tcon unregisters and is freed. The registration then still points at the freed first tcon, so taking tc_lock or incrementing tc_count through swnreg->tcon only moves the use-after-free earlier. Taking tc_lock while holding cifs_swnreg_idr_mutex also violates the documented CIFS lock order. Fix this by making the registration store only the stable witness identity: id, net name, share name, and notify flags. When a notify arrives, copy that identity under cifs_swnreg_idr_mutex, drop the mutex, then find and pin a live witness tcon that currently matches the net/share pair under the normal cifs_tcp_ses_lock -> tc_lock order. The notification path uses that pinned tcon directly and drops the reference when done. Registration and unregister messages now use the live tcon passed by the caller instead of a cached tcon in the registration. The final unregister send is folded into cifs_swn_unregister() while the registration is still protected by cifs_swnreg_idr_mutex. This removes the previous find/drop/reacquire raw-pointer window. The release path only removes the idr entry and frees the stable identity strings. This preserves the intended one-registration/many-tcon behavior: a registration id represents a net/share pair, and notify handling acts on a live representative selected at use time. It also preserves CLIENT_MOVE ordering for the representative tcon because the old-IP unregister is sent before cifs_swn_register() sends the new-IP register.

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/51d18db392e5386a7…
https://git.kernel.org/stable/c/aa3c0cab4b28c5007…
https://git.kernel.org/stable/c/945b4a4a54497db1d…
https://git.kernel.org/stable/c/91b8a58c6ac15c7db…
https://git.kernel.org/stable/c/0700f946659d0ab23…
https://git.kernel.org/stable/c/ec457f9afe5ae9538…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 , < 51d18db392e5386a7bb9e816d611f14e600cca3c (git) Affected: fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 , < aa3c0cab4b28c5007ec570c63e1d6ad6943ed0fd (git) Affected: fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 , < 945b4a4a54497db1dcb2f20ef801a84e884dac21 (git) Affected: fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 , < 91b8a58c6ac15c7db6518f696389933282f88da7 (git) Affected: fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 , < 0700f946659d0ab2352ec8a9b1c6fc74b13a27d7 (git) Affected: fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 , < ec457f9afe5ae9538bdcd58fd4cb442b9787e183 (git)
Linux	Linux	Affected: 5.11 Unaffected: 0 , < 5.11 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: resolve SWN tcon from live registrations\n\ncifs_swn_notify() looks up a witness registration by id under\ncifs_swnreg_idr_mutex, drops the mutex, and then uses the registration\u0027s\ncached tcon pointer.  That pointer is not a lifetime reference, and it is\nnot a stable representative once cifs_get_swn_reg() lets multiple tcons\nfor the same net/share name share one registration id.\n\nA same-share second mount can keep the cifs_swn_reg alive after the first\ntcon unregisters and is freed.  The registration then still points at the\nfreed first tcon, so taking tc_lock or incrementing tc_count through\nswnreg-\u003etcon only moves the use-after-free earlier.  Taking tc_lock while\nholding cifs_swnreg_idr_mutex also violates the documented CIFS lock\norder.\n\nFix this by making the registration store only the stable witness\nidentity: id, net name, share name, and notify flags.  When a notify\narrives, copy that identity under cifs_swnreg_idr_mutex, drop the mutex,\nthen find and pin a live witness tcon that currently matches the net/share\npair under the normal cifs_tcp_ses_lock -\u003e tc_lock order.  The notification\npath uses that pinned tcon directly and drops the reference when done.\n\nRegistration and unregister messages now use the live tcon passed by the\ncaller instead of a cached tcon in the registration.  The final unregister\nsend is folded into cifs_swn_unregister() while the registration is still\nprotected by cifs_swnreg_idr_mutex.  This removes the previous\nfind/drop/reacquire raw-pointer window.  The release path only removes the\nidr entry and frees the stable identity strings.\n\nThis preserves the intended one-registration/many-tcon behavior: a\nregistration id represents a net/share pair, and notify handling acts on a\nlive representative selected at use time.  It also preserves CLIENT_MOVE\nordering for the representative tcon because the old-IP unregister is sent\nbefore cifs_swn_register() sends the new-IP register."
        }
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    "datePublished": "2026-07-25T08:50:44.361Z",
    "dateReserved": "2026-07-19T15:36:31.785Z",
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The registration then still points at the\\nfreed first tcon, so taking tc_lock or incrementing tc_count through\\nswnreg-\u003etcon only moves the use-after-free earlier.  Taking tc_lock while\\nholding cifs_swnreg_idr_mutex also violates the documented CIFS lock\\norder.\\n\\nFix this by making the registration store only the stable witness\\nidentity: id, net name, share name, and notify flags.  When a notify\\narrives, copy that identity under cifs_swnreg_idr_mutex, drop the mutex,\\nthen find and pin a live witness tcon that currently matches the net/share\\npair under the normal cifs_tcp_ses_lock -\u003e tc_lock order.  The notification\\npath uses that pinned tcon directly and drops the reference when done.\\n\\nRegistration and unregister messages now use the live tcon passed by the\\ncaller instead of a cached tcon in the registration.  The final unregister\\nsend is folded into cifs_swn_unregister() while the registration is still\\nprotected by cifs_swnreg_idr_mutex.  This removes the previous\\nfind/drop/reacquire raw-pointer window.  The release path only removes the\\nidr entry and frees the stable identity strings.\\n\\nThis preserves the intended one-registration/many-tcon behavior: a\\nregistration id represents a net/share pair, and notify handling acts on a\\nlive representative selected at use time.  It also preserves CLIENT_MOVE\\nordering for the representative tcon because the old-IP unregister is sent\\nbefore cifs_swn_register() sends the new-IP register.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/smb/client/cifs_swn.c\",\"fs/smb/client/trace.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8\",\"lessThan\":\"51d18db392e5386a7bb9e816d611f14e600cca3c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8\",\"lessThan\":\"aa3c0cab4b28c5007ec570c63e1d6ad6943ed0fd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8\",\"lessThan\":\"945b4a4a54497db1dcb2f20ef801a84e884dac21\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8\",\"lessThan\":\"91b8a58c6ac15c7db6518f696389933282f88da7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8\",\"lessThan\":\"0700f946659d0ab2352ec8a9b1c6fc74b13a27d7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8\",\"lessThan\":\"ec457f9afe5ae9538bdcd58fd4cb442b9787e183\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/smb/client/cifs_swn.c\",\"fs/smb/client/trace.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0700f946659d0ab2352ec8a9b1c6fc74b13a27d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51d18db392e5386a7bb9e816d611f14e600cca3c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91b8a58c6ac15c7db6518f696389933282f88da7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/945b4a4a54497db1dcb2f20ef801a84e884dac21\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa3c0cab4b28c5007ec570c63e1d6ad6943ed0fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ec457f9afe5ae9538bdcd58fd4cb442b9787e183\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:00:02Z",
      "cve": "CVE-2026-64401",
      "id": "CVE-2026-64401",
      "initial_release_date": "2026-07-25T16:00:02Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64401",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64401.json",
      "version": "2"
    }
  }
}

GHSA-GWW6-QC28-623P

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

smb: client: resolve SWN tcon from live registrations

cifs_swn_notify() looks up a witness registration by id under cifs_swnreg_idr_mutex, drops the mutex, and then uses the registration's cached tcon pointer. That pointer is not a lifetime reference, and it is not a stable representative once cifs_get_swn_reg() lets multiple tcons for the same net/share name share one registration id.

A same-share second mount can keep the cifs_swn_reg alive after the first tcon unregisters and is freed. The registration then still points at the freed first tcon, so taking tc_lock or incrementing tc_count through swnreg->tcon only moves the use-after-free earlier. Taking tc_lock while holding cifs_swnreg_idr_mutex also violates the documented CIFS lock order.

Fix this by making the registration store only the stable witness identity: id, net name, share name, and notify flags. When a notify arrives, copy that identity under cifs_swnreg_idr_mutex, drop the mutex, then find and pin a live witness tcon that currently matches the net/share pair under the normal cifs_tcp_ses_lock -> tc_lock order. The notification path uses that pinned tcon directly and drops the reference when done.

Registration and unregister messages now use the live tcon passed by the caller instead of a cached tcon in the registration. The final unregister send is folded into cifs_swn_unregister() while the registration is still protected by cifs_swnreg_idr_mutex. This removes the previous find/drop/reacquire raw-pointer window. The release path only removes the idr entry and frees the stable identity strings.

This preserves the intended one-registration/many-tcon behavior: a registration id represents a net/share pair, and notify handling acts on a live representative selected at use time. It also preserves CLIENT_MOVE ordering for the representative tcon because the old-IP unregister is sent before cifs_swn_register() sends the new-IP register.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64401"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:23Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: resolve SWN tcon from live registrations\n\ncifs_swn_notify() looks up a witness registration by id under\ncifs_swnreg_idr_mutex, drops the mutex, and then uses the registration\u0027s\ncached tcon pointer.  That pointer is not a lifetime reference, and it is\nnot a stable representative once cifs_get_swn_reg() lets multiple tcons\nfor the same net/share name share one registration id.\n\nA same-share second mount can keep the cifs_swn_reg alive after the first\ntcon unregisters and is freed.  The registration then still points at the\nfreed first tcon, so taking tc_lock or incrementing tc_count through\nswnreg-\u003etcon only moves the use-after-free earlier.  Taking tc_lock while\nholding cifs_swnreg_idr_mutex also violates the documented CIFS lock\norder.\n\nFix this by making the registration store only the stable witness\nidentity: id, net name, share name, and notify flags.  When a notify\narrives, copy that identity under cifs_swnreg_idr_mutex, drop the mutex,\nthen find and pin a live witness tcon that currently matches the net/share\npair under the normal cifs_tcp_ses_lock -\u003e tc_lock order.  The notification\npath uses that pinned tcon directly and drops the reference when done.\n\nRegistration and unregister messages now use the live tcon passed by the\ncaller instead of a cached tcon in the registration.  The final unregister\nsend is folded into cifs_swn_unregister() while the registration is still\nprotected by cifs_swnreg_idr_mutex.  This removes the previous\nfind/drop/reacquire raw-pointer window.  The release path only removes the\nidr entry and frees the stable identity strings.\n\nThis preserves the intended one-registration/many-tcon behavior: a\nregistration id represents a net/share pair, and notify handling acts on a\nlive representative selected at use time.  It also preserves CLIENT_MOVE\nordering for the representative tcon because the old-IP unregister is sent\nbefore cifs_swn_register() sends the new-IP register.",
  "id": "GHSA-gww6-qc28-623p",
  "modified": "2026-07-25T12:31:34Z",
  "published": "2026-07-25T12:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64401"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0700f946659d0ab2352ec8a9b1c6fc74b13a27d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51d18db392e5386a7bb9e816d611f14e600cca3c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91b8a58c6ac15c7db6518f696389933282f88da7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/945b4a4a54497db1dcb2f20ef801a84e884dac21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa3c0cab4b28c5007ec570c63e1d6ad6943ed0fd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ec457f9afe5ae9538bdcd58fd4cb442b9787e183"
    }
  ],
  "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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64401 (GCVE-0-2026-64401)

GHSA-GWW6-QC28-623P

Tags

Sightings

Nomenclature