Vulnerability-Lookup

FKIE_CVE-2026-64266

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-08-17 05:17

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: re-lock request before returning from fuse_ref_folio() fuse_ref_folio() unlocks the request but does not re-lock it before returning. fuse_chan_abort() can end the request and the async end callback (eg fuse_writepage_free()) can free the args while the subsequent copy chain logic after fuse_ref_folio() accesses them, leading to use-after-free issues. Fix this by locking the request in fuse_ref_folio() before returning.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/fuse/dev.c"
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: re-lock request before returning from fuse_ref_folio()\n\nfuse_ref_folio() unlocks the request but does not re-lock it before\nreturning. fuse_chan_abort() can end the request and the async end\ncallback (eg fuse_writepage_free()) can free the args while the\nsubsequent copy chain logic after fuse_ref_folio() accesses them,\nleading to use-after-free issues.\n\nFix this by locking the request in fuse_ref_folio() before returning."
    }
  ],
  "id": "CVE-2026-64266",
  "lastModified": "2026-08-17T05:17:25.407",
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
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          "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",
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        "type": "Secondary"
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  "published": "2026-07-25T10:17:06.783",
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          "lang": "en",
          "value": "CWE-416"
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      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-64266 (GCVE-0-2026-64266)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-08-17 04:52

Title

fuse: re-lock request before returning from fuse_ref_folio()

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 mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/1f9156714592356b4…
https://git.kernel.org/stable/c/5630da218a45ba80f…
https://git.kernel.org/stable/c/1ca605cfa59377f01…
https://git.kernel.org/stable/c/0e4a5a000123d8123…
https://git.kernel.org/stable/c/e6aa539720c3d8def…
https://git.kernel.org/stable/c/be353caffa8640f5e…
https://git.kernel.org/stable/c/65a1c2551f7e16085…
https://git.kernel.org/stable/c/b5befa80fdbe287a9…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c3021629a0d820247ee12b6c5192a1d5380e21c6 , < 1f9156714592356b4fda57beac7eab9c2a462dd3 (git) Affected: c3021629a0d820247ee12b6c5192a1d5380e21c6 , < 5630da218a45ba80f0aba0846cbe8aa655da122b (git) Affected: c3021629a0d820247ee12b6c5192a1d5380e21c6 , < 1ca605cfa59377f0143fb35b5b01360f37d1b7c4 (git) Affected: c3021629a0d820247ee12b6c5192a1d5380e21c6 , < 0e4a5a000123d81234e27a2f8187688cf608f755 (git) Affected: c3021629a0d820247ee12b6c5192a1d5380e21c6 , < e6aa539720c3d8def69683ed0c07cf9faea4e8be (git) Affected: c3021629a0d820247ee12b6c5192a1d5380e21c6 , < be353caffa8640f5e25fb3714ce8b0cef5e410e5 (git) Affected: c3021629a0d820247ee12b6c5192a1d5380e21c6 , < 65a1c2551f7e16085acbb54aedde1feaa559ba7a (git) Affected: c3021629a0d820247ee12b6c5192a1d5380e21c6 , < b5befa80fdbe287a98480effed9564712924add5 (git)
Linux	Linux	Affected: 2.6.35 Unaffected: 0 , < 2.6.35 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/fuse/dev.c"
          ],
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        }
      ],
      "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 - A local attacker reaches the flaw by serving a self-created FUSE mount and invoking splice() on its associated /dev/fuse descriptor.\nAC:L - The attacker controls writeback generation, splice processing, and concurrent connection abort, allowing repeated attempts at the race without an uncontrollable prerequisite.\nPR:L - FUSE supports user-namespace mounts, and an unprivileged mount owner can operate /dev/fuse and abort their own connection without init-namespace root.\nUI:N - The attacker can create and exercise their own FUSE connection without any victim action.\nS:U - Exploitation compromises the kernel within the same operating-system security authority and does not inherently cross a virtualization boundary.\nC:H - The freed argument and folio arrays are subsequently dereferenced, permitting attacker-influenced stale folio pointers and potential arbitrary kernel-memory disclosure through pipe buffers.\nI:H - Heap reclamation can replace the freed folio pointers and loop metadata, enabling attacker-directed memory or refcount operations that may support arbitrary writes and kernel code execution.\nA:H - The repeatable use-after-free and invalid folio operations can cause an oops, panic, or other complete system failure."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:52:20.108Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3"
        },
        {
          "url": "https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755"
        },
        {
          "url": "https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be"
        },
        {
          "url": "https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a"
        },
        {
          "url": "https://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5"
        }
      ],
      "title": "fuse: re-lock request before returning from fuse_ref_folio()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64266",
    "datePublished": "2026-07-25T08:49:15.142Z",
    "dateReserved": "2026-07-19T15:36:31.775Z",
    "dateUpdated": "2026-08-17T04:52:20.108Z",
    "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

FKIE_CVE-2026-64266

CVE-2026-64266 (GCVE-0-2026-64266)

Tags

Sightings

Nomenclature