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CVE-2026-80858 (GCVE-0-2026-80858)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:55 – Updated: 2026-09-11 09:57
VLAI
Title
fuse: publish io-uring queues with release semantics
Summary
In the Linux kernel, the following vulnerability has been resolved: fuse: publish io-uring queues with release semantics fuse_uring_create_queue() initializes a fuse_ring_queue and then publishes the pointer into ring->queues[qid] with WRITE_ONCE() under the fch->lock. There are several readers that may concurrently be fetching that pointer locklessly and then deferencing it. WRITE_ONCE() doesn't ensure ordering of the queue's field initialization before the ring->queues[qid] pointer assignment. The queue must be published with smp_store_release() so the field initialization is guaranteed to happen before. Readers in paths where the read may happen concurrently with the store need to use READ_ONCE() because any race involving a plain access is undefined.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 24fe962c86f55347385933a1b06ca71b60854690 , < a5bb215dbc34b4c6a5e144ea1416bf66450d519f (git)
Affected: 24fe962c86f55347385933a1b06ca71b60854690 , < a1bb359c443d048fe5dfd6ca9caf4e3897f3e9aa (git)
Affected: 24fe962c86f55347385933a1b06ca71b60854690 , < 42df916e5a5f8fb4b60c8cefb54318d1ec02c580 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "fs/fuse/dev_uring.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: publish io-uring queues with release semantics\n\nfuse_uring_create_queue() initializes a fuse_ring_queue and then\npublishes the pointer into ring-\u003equeues[qid] with WRITE_ONCE() under the\nfch-\u003elock. There are several readers that may concurrently be fetching\nthat pointer locklessly and then deferencing it.\n\nWRITE_ONCE() doesn\u0027t ensure ordering of the queue\u0027s field\ninitialization before the ring-\u003equeues[qid] pointer assignment. The\nqueue must be published with smp_store_release() so the field\ninitialization is guaranteed to happen before.\n\nReaders in paths where the read may happen concurrently with the store\nneed to use READ_ONCE() because any race involving a plain access is\nundefined."
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    "datePublished": "2026-09-04T15:55:12.442Z",
    "dateReserved": "2026-08-26T14:34:25.797Z",
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    "state": "PUBLISHED"
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          }
        ],
        "id": "CVE-2026-80858",
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        "metrics": {},
        "published": "2026-09-04T16:18:14.940",
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      "cve": "CVE-2026-80858",
      "id": "CVE-2026-80858",
      "initial_release_date": "2026-09-05T00:25:58Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80858",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80858.json",
      "version": "3"
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}



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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.
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  • 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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