CVE-2026-64265 (GCVE-0-2026-64265)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-27 04:59
VLAI
Title
fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req
Summary
In the Linux kernel, the following vulnerability has been resolved: fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req When fuse_resend() moves a request from fpq->processing back to fiq->pending, it sets FR_PENDING and clears FR_SENT but does not remove the requests intr_entry from fiq->interrupts. If the request had FR_INTERRUPTED set from a prior signal, intr_entry remains dangling on fiq->interrupts. When the requesting task then receives a fatal signal, fuse_remove_pending_req() sees FR_PENDING=1, removes the request from fiq->pending and frees it via the refcount path, also without cleaning intr_entry. The stale intr_entry causes use-after-free when fuse_read_interrupt() iterates fiq->interrupts: - list_del_init(&req->intr_entry) -> UAF write on freed slab - req->in.h.unique -> UAF read, data leaked to userspace Remove intr_entry from fiq->interrupts in fuse_resend() for interrupted requests before they are placed back on fiq->pending. Add a WARN_ON if the intr_entry is not empty on request destruction.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 760eac73f9f69aa28fcb3050b4946c2dcc656d12 , < 1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c (git)
Affected: 760eac73f9f69aa28fcb3050b4946c2dcc656d12 , < 7366e6f4d2b4c7002b13fb01219e83679dad4127 (git)
Affected: 760eac73f9f69aa28fcb3050b4946c2dcc656d12 , < 893479015cb6442fd389d3b553ab3036c9541715 (git)
Affected: 760eac73f9f69aa28fcb3050b4946c2dcc656d12 , < f8fce75fedf73ac72aa09163deb8f4291fdcaad2 (git)
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Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (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-rc1 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: clear intr_entry in fuse_resend and fuse_remove_pending_req\n\nWhen fuse_resend() moves a request from fpq-\u003eprocessing back to\nfiq-\u003epending, it sets FR_PENDING and clears FR_SENT but does not\nremove the requests intr_entry from fiq-\u003einterrupts.  If the\nrequest had FR_INTERRUPTED set from a prior signal, intr_entry\nremains dangling on fiq-\u003einterrupts.  When the requesting task\nthen receives a fatal signal, fuse_remove_pending_req() sees\nFR_PENDING=1, removes the request from fiq-\u003epending and frees it\nvia the refcount path, also without cleaning intr_entry.  The\nstale intr_entry causes use-after-free when fuse_read_interrupt()\niterates fiq-\u003einterrupts:\n  - list_del_init(\u0026req-\u003eintr_entry) -\u003e UAF write on freed slab\n  - req-\u003ein.h.unique -\u003e UAF read, data leaked to userspace\n\nRemove intr_entry from fiq-\u003einterrupts in fuse_resend() for\ninterrupted requests before they are placed back on fiq-\u003epending.\n\nAdd a WARN_ON if the intr_entry is not empty on request destruction."
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    "datePublished": "2026-07-25T08:49:14.548Z",
    "dateReserved": "2026-07-19T15:36:31.774Z",
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:47:01Z",
      "cve": "CVE-2026-64265",
      "id": "CVE-2026-64265",
      "initial_release_date": "2026-07-25T16:47:01Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64265",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64265.json",
      "version": "2"
    }
  }
}



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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.
  • 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.


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