CVE-2026-72356 (GCVE-0-2026-72356)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:43
VLAI
Title
cifs: Fix missing credit release on failure in cifs_issue_read()
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix missing credit release on failure in cifs_issue_read() Fix missing release of credits in the failure path in cifs_issue_read() lest retrying the subreq just overwrites the credits value.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 69c3c023af25edb5433a2db824d3e7cc328f0183 , < b9ee1f0347bf56d019ca28ddff090234bb45b05c (git)
Affected: 69c3c023af25edb5433a2db824d3e7cc328f0183 , < 86652704a7fd41a5a8459027e08640bbd1952826 (git)
Affected: 69c3c023af25edb5433a2db824d3e7cc328f0183 , < 3a303f985c6bec8787c2ad4a16b39c14c5bcd765 (git)
Affected: 69c3c023af25edb5433a2db824d3e7cc328f0183 , < c16b8c4cfb4fe2244cc33e469a93c1ab8684146b (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/file.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "6.10"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix missing credit release on failure in cifs_issue_read()\n\nFix missing release of credits in the failure path in cifs_issue_read()\nlest retrying the subreq just overwrites the credits value."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is in the CIFS/SMB client read path reached over TCP/445 when netfs issues reads; a malicious or compromised remote SMB server can provoke replayable async_readv failures (-EAGAIN/-ECONNABORTED) after credits are reserved, matching prior client-side CIFS credit CVEs scored as Network.\nAC:L - The remote server controls both sides of the retry: it can reset the connection or force reconnects to return replayable errors, and netfs reissues the same subrequest deterministically; no race or memory-layout condition outside attacker control is required.\nPR:N - The attacker is the remote SMB peer and needs no account, credentials, or local privileges on the victim; exploitation occurs during normal read/writeback I/O on an already-established CIFS mount (fstab, autofs, Azure Files, enterprise NAS).\nUI:N - Once a CIFS mount exists, the server triggers the flaw by its responses to client-initiated reads with no further victim interaction; mounting is a deployment precondition, not an action required at exploit time per kernel CNA convention for client filesystem bugs.\nS:U - Impact is confined to SMB credit/in_flight accounting and I/O scheduling within the client kernel; it does not cross VM, IOMMU, or sandbox security boundaries.\nC:N - The flaw leaks SMB protocol credits and misaccounts counters; it does not read or disclose kernel memory, user data, or pointers, and provides no information-disclosure primitive.\nI:N - No memory corruption, type confusion, or arbitrary write occurs; the only effect is permanently losing credits from the server pool when a failed read subrequest is retried without releasing them first.\nA:H - Each leaked credit permanently depletes server-\u003ecredits; repeated retries exhaust the pool until smb2_wait_mtu_credits blocks all CIFS I/O on that connection in uninterruptible waits, causing system-wide hang/DoS for processes using the mount."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:43:14.352Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/b9ee1f0347bf56d019ca28ddff090234bb45b05c"
        },
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          "url": "https://git.kernel.org/stable/c/86652704a7fd41a5a8459027e08640bbd1952826"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a303f985c6bec8787c2ad4a16b39c14c5bcd765"
        },
        {
          "url": "https://git.kernel.org/stable/c/c16b8c4cfb4fe2244cc33e469a93c1ab8684146b"
        }
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      "title": "cifs: Fix missing credit release on failure in cifs_issue_read()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72356",
    "datePublished": "2026-08-15T05:55:57.464Z",
    "dateReserved": "2026-08-09T03:40:39.921Z",
    "dateUpdated": "2026-08-17T05:43:14.352Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-09-21",
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        "descriptions": [
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix missing credit release on failure in cifs_issue_read()\n\nFix missing release of credits in the failure path in cifs_issue_read()\nlest retrying the subreq just overwrites the credits value."
          }
        ],
        "id": "CVE-2026-72356",
        "lastModified": "2026-08-17T06:18:39.780",
        "metrics": {
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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        "vulnStatus": "Received"
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    "redhat_vex": {
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      "current_release_date": "2026-08-18T10:50:07+00:00",
      "cve": "CVE-2026-72356",
      "id": "CVE-2026-72356",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cifs: Fix missing credit release on failure in cifs_issue_read()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72356.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:26:38Z",
      "cve": "CVE-2026-72356",
      "id": "CVE-2026-72356",
      "initial_release_date": "2026-08-27T16:53:23Z",
      "product_status:known_affected": "29",
      "product_status:known_not_affected": "333",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72356",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72356.json",
      "version": "5"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • 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.


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