binfmt_misc: restore write access when removing an entry

{
  "id": "0214414cb9d910b5e42e5d1a86777892923aa3d4a07875eb718e2c3935b5b634",
  "url": "https://osv.dev/vulnerability/CVE-2026-74487",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "binfmt_misc: restore write access when removing an entry",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: binfmt_misc: restore write access when removing an entry Registering an entry with the MISC_FMT_OPEN_FILE flag opens the interpreter via open_exec() which denies write access to it for as long as the entry exists. Removing the entry closes the interpreter file via filp_close() but never restores write access, leaving the inode's i_writecount permanently negative. Opening the interpreter for writing keeps failing with ETXTBSY long after the entry is gone until the inode is evicted from the inode cache. Commit 90f601b497d7 (\"binfmt_misc: restore write access before closing files opened by open_exec()\") fixed the same imbalance in the error path of bm_register_write() but the actual removal path has been leaking the write denial since the introduction of the flag. Restore write access in put_binfmt_handler() before closing the interpreter file.",
    "evidence": "osv:CVE-2026-74487",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.10.266",
            "evidence": "/affected/1/ranges"
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            "value": "5.15.217",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.1.184",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "value": "6.12.105",
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            "value": "7.1.8",
            "evidence": "/affected/1/ranges"
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        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-74487",
      "aliases": [
        "CVE-2026-74487"
      ],
      "affected": [
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                  "fixed": "13efc628fdf641d901bdba07caa1c558e1bed046"
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                {
                  "fixed": "f1cf67f6be0babc73afa4ee0e27bdedffeeeb095"
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                {
                  "fixed": "a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8"
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                  "fixed": "fdc1d702bf3001586221fa07e598e876a0a854c5"
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              "type": "ECOSYSTEM",
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                  "introduced": "4.8.0"
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                {
                  "fixed": "5.10.266"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:29.391742106Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/13efc628fdf641d901bdba07caa1c558e1bed046",
        "https://git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b",
        "https://git.kernel.org/stable/c/7873f987213695e3564c8c259e6db283e4739472",
        "https://git.kernel.org/stable/c/a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8",
        "https://git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa",
        "https://git.kernel.org/stable/c/dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c",
        "https://git.kernel.org/stable/c/f1cf67f6be0babc73afa4ee0e27bdedffeeeb095",
        "https://git.kernel.org/stable/c/fdc1d702bf3001586221fa07e598e876a0a854c5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74487.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74487",
        "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/2026/74xxx/CVE-2026-74487.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74487",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 496362,
  "published_at": "2026-08-15T12:27:18.236+00:00"
}