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

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-23 12:47
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.
Assigner
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)
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    "datePublished": "2026-08-15T12:27:18.236Z",
    "dateReserved": "2026-08-15T05:44:03.905Z",
    "dateUpdated": "2026-08-23T12:47:26.657Z",
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-21T08:45:41+00:00",
      "cve": "CVE-2026-74487",
      "id": "CVE-2026-74487",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: binfmt_misc: restore write access when removing an entry",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74487.json",
      "version": "3"
    }
  }
}



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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

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.