FKIE_CVE-2026-74487

Vulnerability from fkie_nvd - Published: 2026-08-15 13:17 - Updated: 2026-08-23 13:16
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/13efc628fdf641d901bdba07caa1c558e1bed046
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7873f987213695e3564c8c259e6db283e4739472
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1cf67f6be0babc73afa4ee0e27bdedffeeeb095
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fdc1d702bf3001586221fa07e598e876a0a854c5
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/binfmt_misc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7873f987213695e3564c8c259e6db283e4739472",
              "status": "affected",
              "version": "948b701a607f123df92ed29084413e5dd8cda2ed",
              "versionType": "git"
            },
            {
              "lessThan": "13efc628fdf641d901bdba07caa1c558e1bed046",
              "status": "affected",
              "version": "948b701a607f123df92ed29084413e5dd8cda2ed",
              "versionType": "git"
            },
            {
              "lessThan": "f1cf67f6be0babc73afa4ee0e27bdedffeeeb095",
              "status": "affected",
              "version": "948b701a607f123df92ed29084413e5dd8cda2ed",
              "versionType": "git"
            },
            {
              "lessThan": "dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c",
              "status": "affected",
              "version": "948b701a607f123df92ed29084413e5dd8cda2ed",
              "versionType": "git"
            },
            {
              "lessThan": "a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8",
              "status": "affected",
              "version": "948b701a607f123df92ed29084413e5dd8cda2ed",
              "versionType": "git"
            },
            {
              "lessThan": "fdc1d702bf3001586221fa07e598e876a0a854c5",
              "status": "affected",
              "version": "948b701a607f123df92ed29084413e5dd8cda2ed",
              "versionType": "git"
            },
            {
              "lessThan": "3b522487a3a9162b1b519eefde7998d103e3e07b",
              "status": "affected",
              "version": "948b701a607f123df92ed29084413e5dd8cda2ed",
              "versionType": "git"
            },
            {
              "lessThan": "db1856ea9196cf6e015d12199a34c0b9313c7bfa",
              "status": "affected",
              "version": "948b701a607f123df92ed29084413e5dd8cda2ed",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/binfmt_misc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.266",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.153",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.105",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinfmt_misc: restore write access when removing an entry\n\nRegistering an entry with the MISC_FMT_OPEN_FILE flag opens the\ninterpreter via open_exec() which denies write access to it for as\nlong as the entry exists. Removing the entry closes the interpreter\nfile via filp_close() but never restores write access, leaving the\ninode\u0027s i_writecount permanently negative. Opening the interpreter\nfor writing keeps failing with ETXTBSY long after the entry is gone\nuntil the inode is evicted from the inode cache.\n\nCommit 90f601b497d7 (\"binfmt_misc: restore write access before\nclosing files opened by open_exec()\") fixed the same imbalance in the\nerror path of bm_register_write() but the actual removal path has\nbeen leaking the write denial since the introduction of the flag.\n\nRestore write access in put_binfmt_handler() before closing the\ninterpreter file."
    }
  ],
  "id": "CVE-2026-74487",
  "lastModified": "2026-08-23T13:16:44.750",
  "metrics": {},
  "published": "2026-08-15T13:17:53.593",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/13efc628fdf641d901bdba07caa1c558e1bed046"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7873f987213695e3564c8c259e6db283e4739472"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f1cf67f6be0babc73afa4ee0e27bdedffeeeb095"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fdc1d702bf3001586221fa07e598e876a0a854c5"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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