fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req

{
  "id": "043b131e16834c53fc8fa2f64ef8dde33fa5b4412f7a06914d14923d5858de1c",
  "url": "https://osv.dev/vulnerability/CVE-2026-64265",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-64265",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.96",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.39",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-64265",
      "aliases": [
        "CVE-2026-64265"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "760eac73f9f69aa28fcb3050b4946c2dcc656d12"
                },
                {
                  "fixed": "1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c"
                },
                {
                  "fixed": "7366e6f4d2b4c7002b13fb01219e83679dad4127"
                },
                {
                  "fixed": "893479015cb6442fd389d3b553ab3036c9541715"
                },
                {
                  "fixed": "f8fce75fedf73ac72aa09163deb8f4291fdcaad2"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64265.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.9.0"
                },
                {
                  "fixed": "6.12.96"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.39"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64265.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.981262503Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c",
        "https://git.kernel.org/stable/c/7366e6f4d2b4c7002b13fb01219e83679dad4127",
        "https://git.kernel.org/stable/c/893479015cb6442fd389d3b553ab3036c9541715",
        "https://git.kernel.org/stable/c/f8fce75fedf73ac72aa09163deb8f4291fdcaad2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64265.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64265",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64265.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64265",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514012,
  "published_at": "2026-07-25T08:49:14.548+00:00"
}