Vulnerability-Lookup

GHSA-FVFJ-X9C7-958J

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-72356"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:09Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-fvfj-x9c7-958j",
  "modified": "2026-08-17T06:33:25Z",
  "published": "2026-08-15T06:32:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72356"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a303f985c6bec8787c2ad4a16b39c14c5bcd765"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86652704a7fd41a5a8459027e08640bbd1952826"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9ee1f0347bf56d019ca28ddff090234bb45b05c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c16b8c4cfb4fe2244cc33e469a93c1ab8684146b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:43

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

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/b9ee1f0347bf56d01…
https://git.kernel.org/stable/c/86652704a7fd41a5a…
https://git.kernel.org/stable/c/3a303f985c6bec878…
https://git.kernel.org/stable/c/c16b8c4cfb4fe2244…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 69c3c023af25edb5433a2db824d3e7cc328f0183 , < b9ee1f0347bf56d019ca28ddff090234bb45b05c (git) Affected: 69c3c023af25edb5433a2db824d3e7cc328f0183 , < 86652704a7fd41a5a8459027e08640bbd1952826 (git) Affected: 69c3c023af25edb5433a2db824d3e7cc328f0183 , < 3a303f985c6bec8787c2ad4a16b39c14c5bcd765 (git) Affected: 69c3c023af25edb5433a2db824d3e7cc328f0183 , < c16b8c4cfb4fe2244cc33e469a93c1ab8684146b (git)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/file.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b9ee1f0347bf56d019ca28ddff090234bb45b05c",
              "status": "affected",
              "version": "69c3c023af25edb5433a2db824d3e7cc328f0183",
              "versionType": "git"
            },
            {
              "lessThan": "86652704a7fd41a5a8459027e08640bbd1952826",
              "status": "affected",
              "version": "69c3c023af25edb5433a2db824d3e7cc328f0183",
              "versionType": "git"
            },
            {
              "lessThan": "3a303f985c6bec8787c2ad4a16b39c14c5bcd765",
              "status": "affected",
              "version": "69c3c023af25edb5433a2db824d3e7cc328f0183",
              "versionType": "git"
            },
            {
              "lessThan": "c16b8c4cfb4fe2244cc33e469a93c1ab8684146b",
              "status": "affected",
              "version": "69c3c023af25edb5433a2db824d3e7cc328f0183",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/file.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b9ee1f0347bf56d019ca28ddff090234bb45b05c"
        },
        {
          "url": "https://git.kernel.org/stable/c/86652704a7fd41a5a8459027e08640bbd1952826"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a303f985c6bec8787c2ad4a16b39c14c5bcd765"
        },
        {
          "url": "https://git.kernel.org/stable/c/c16b8c4cfb4fe2244cc33e469a93c1ab8684146b"
        }
      ],
      "title": "cifs: Fix missing credit release on failure in cifs_issue_read()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-FVFJ-X9C7-958J

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

Tags

Sightings

Nomenclature