Vulnerability-Lookup

FKIE_CVE-2026-64260

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-30 15:00

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: fuse-uring: Avoid queue->stopped races and set/read that value under lock There are several readers of queue->stopped that check the value under lock, but fuse_uring_commit_fetch() did not and actually the value was not set under the lock in fuse_uring_abort_end_requests() either. Especially in fuse_uring_commit_fetch it is important to check under a lock, because due to races 'struct fuse_req' might be freed with fuse_request_end, but another thread/cpu might already do teardown work.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/39c8e925b207afceffaa5382416ed405e0223a03
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4021a3a79eee551d95fe1e1e7c1b195d34ba8c08
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b70a3aca16934c196f92abb17b01c1647b9bb63c

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/fuse/dev_uring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "39c8e925b207afceffaa5382416ed405e0223a03",
              "status": "affected",
              "version": "4a9bfb9b6850fec0685447aed280533cf980de70",
              "versionType": "git"
            },
            {
              "lessThan": "4021a3a79eee551d95fe1e1e7c1b195d34ba8c08",
              "status": "affected",
              "version": "4a9bfb9b6850fec0685447aed280533cf980de70",
              "versionType": "git"
            },
            {
              "lessThan": "b70a3aca16934c196f92abb17b01c1647b9bb63c",
              "status": "affected",
              "version": "4a9bfb9b6850fec0685447aed280533cf980de70",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/fuse/dev_uring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: Avoid queue-\u003estopped races and set/read that value under lock\n\nThere are several readers of queue-\u003estopped that check the value\nunder lock, but fuse_uring_commit_fetch() did not and actually\nthe value was not set under the lock in fuse_uring_abort_end_requests()\neither. Especially in fuse_uring_commit_fetch it is important\nto check under a lock, because due to races \u0027struct fuse_req\u0027\nmight be freed with fuse_request_end, but another thread/cpu\nmight already do teardown work."
    }
  ],
  "id": "CVE-2026-64260",
  "lastModified": "2026-07-30T15:00:27.343",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-25T10:17:06.137",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/39c8e925b207afceffaa5382416ed405e0223a03"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4021a3a79eee551d95fe1e1e7c1b195d34ba8c08"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b70a3aca16934c196f92abb17b01c1647b9bb63c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

CVE-2026-64260 (GCVE-0-2026-64260)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-08-05 12:40

Title

fuse-uring: Avoid queue->stopped races and set/read that value under lock

Summary

Severity

7.8 (High)


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

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/39c8e925b207afcef…
https://git.kernel.org/stable/c/4021a3a79eee551d9…
https://git.kernel.org/stable/c/b70a3aca16934c196…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4a9bfb9b6850fec0685447aed280533cf980de70 , < 39c8e925b207afceffaa5382416ed405e0223a03 (git) Affected: 4a9bfb9b6850fec0685447aed280533cf980de70 , < 4021a3a79eee551d95fe1e1e7c1b195d34ba8c08 (git) Affected: 4a9bfb9b6850fec0685447aed280533cf980de70 , < b70a3aca16934c196f92abb17b01c1647b9bb63c (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/fuse/dev_uring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "39c8e925b207afceffaa5382416ed405e0223a03",
              "status": "affected",
              "version": "4a9bfb9b6850fec0685447aed280533cf980de70",
              "versionType": "git"
            },
            {
              "lessThan": "4021a3a79eee551d95fe1e1e7c1b195d34ba8c08",
              "status": "affected",
              "version": "4a9bfb9b6850fec0685447aed280533cf980de70",
              "versionType": "git"
            },
            {
              "lessThan": "b70a3aca16934c196f92abb17b01c1647b9bb63c",
              "status": "affected",
              "version": "4a9bfb9b6850fec0685447aed280533cf980de70",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/fuse/dev_uring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: Avoid queue-\u003estopped races and set/read that value under lock\n\nThere are several readers of queue-\u003estopped that check the value\nunder lock, but fuse_uring_commit_fetch() did not and actually\nthe value was not set under the lock in fuse_uring_abort_end_requests()\neither. Especially in fuse_uring_commit_fetch it is important\nto check under a lock, because due to races \u0027struct fuse_req\u0027\nmight be freed with fuse_request_end, but another thread/cpu\nmight already do teardown work."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is reached locally by submitting IORING_OP_URING_CMD/FUSE_IO_URING_CMD_COMMIT_AND_FETCH operations on an attached /dev/fuse descriptor.\nAC:L - Once FUSE-over-io-uring is enabled, the attacker controls both race participants by issuing commit SQEs while concurrently aborting or unmounting the connection.\nPR:L - An ordinary user can create a FUSE mount through FS_USERNS_MOUNT and user namespaces, submit commands through /dev/fuse, and access the user-owned fusectl abort control without init-namespace capabilities.\nUI:N - The attacker can create the mount, generate FUSE requests, submit commits, and trigger teardown without another user\u0027s participation.\nS:U - This is a standard local kernel privilege-escalation condition within the kernel\u0027s security authority, not a guest-to-host or IOMMU boundary escape.\nC:H - The race causes a fuse_req use-after-free and double-end with stale list, pointer, and refcount accesses, which can be leveraged to disclose arbitrary kernel memory.\nI:H - Teardown writes through stale list pointers, flags, error fields, and refcounts and can corrupt or double-free a reallocated fuse_req, enabling arbitrary kernel writes or control-flow hijacking.\nA:H - The use-after-free, list corruption, and double-ending of requests can cause an oops, panic, deadlock, or complete system compromise."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:40:21.406Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/39c8e925b207afceffaa5382416ed405e0223a03"
        },
        {
          "url": "https://git.kernel.org/stable/c/4021a3a79eee551d95fe1e1e7c1b195d34ba8c08"
        },
        {
          "url": "https://git.kernel.org/stable/c/b70a3aca16934c196f92abb17b01c1647b9bb63c"
        }
      ],
      "title": "fuse-uring: Avoid queue-\u003estopped races and set/read that value under lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64260",
    "datePublished": "2026-07-25T08:49:11.395Z",
    "dateReserved": "2026-07-19T15:36:31.774Z",
    "dateUpdated": "2026-08-05T12:40:21.406Z",
    "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.

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FKIE_CVE-2026-64260

CVE-2026-64260 (GCVE-0-2026-64260)

Tags

Sightings

Nomenclature