CVE-2026-74487 (GCVE-0-2026-74487)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-11-06 17:05
VLAI
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 16:58 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < 7873f987213695e3564c8c259e6db283e4739472 (git)
Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < 13efc628fdf641d901bdba07caa1c558e1bed046 (git)
Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < f1cf67f6be0babc73afa4ee0e27bdedffeeeb095 (git)
Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c (git)
Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8 (git)
Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < fdc1d702bf3001586221fa07e598e876a0a854c5 (git)
Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < 3b522487a3a9162b1b519eefde7998d103e3e07b (git)
Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < db1856ea9196cf6e015d12199a34c0b9313c7bfa (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.153 , ≤ 6.6.* (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "product_status:recommended": "252",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74487",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-74487.json",
      "version": "15"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-74487",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-11-06T16:58:10.653549Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-11-06T16:58:12.505Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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            {
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              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
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                },
                {
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                },
                {
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                },
                {
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                },
                {
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                {
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                {
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                {
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            },
            {
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              ],
              "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"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.266",
                      "versionStartIncluding": "4.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.217",
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                      "vulnerable": true
                    },
                    {
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                      "versionEndExcluding": "6.1.184",
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                    },
                    {
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                      "versionEndExcluding": "6.6.153",
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                    },
                    {
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                    },
                    {
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                      "versionStartIncluding": "4.8",
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                    {
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                      "versionStartIncluding": "4.8",
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                    {
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                      "vulnerable": true
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                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "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."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-23T12:47:26.657Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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            },
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            },
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              "url": "https://git.kernel.org/stable/c/dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c"
            },
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            },
            {
              "url": "https://git.kernel.org/stable/c/fdc1d702bf3001586221fa07e598e876a0a854c5"
            },
            {
              "url": "https://git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b"
            },
            {
              "url": "https://git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa"
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          ],
          "title": "binfmt_misc: restore write access when removing an entry",
          "x_generator": {
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          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-74487",
        "datePublished": "2026-08-15T12:27:18.236Z",
        "dateReserved": "2026-08-15T05:44:03.905Z",
        "dateUpdated": "2026-11-06T17:05:47.321Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • 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.
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Vulnerability timeline

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