GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-74486 (GCVE-0-2026-74486)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-23 12:47
VLAI
Title
binfmt_misc: use exe_file_deny_write_access() for the interpreter clone
Summary
In the Linux kernel, the following vulnerability has been resolved: binfmt_misc: use exe_file_deny_write_access() for the interpreter clone For MISC_FMT_OPEN_FILE entries load_misc_binary() clones the registered interpreter file and denies write access to the clone via plain deny_write_access(). The clone is installed as bprm->interpreter and later released by the exec machinery through exe_file_allow_write_access() which skips the i_writecount increment for files with FMODE_FSNOTIFY_HSM set. The deny and allow side can therefore come to different conclusions when pre-content watches are in play: if a pre-content watch is added to the interpreter after registration every subsequent exec through that entry takes a write denial on the clone that is never paired with a write allowance, driving the interpreter inode's i_writecount further down with each exec and leaving the interpreter unwritable even after the entry and all its users are gone. Take the write denial via exe_file_deny_write_access() so both sides of the pairing base their decision on the same file mode, and propagate failure instead of silently ignoring it: an interpreter that is concurrently open for writing now fails the exec with ETXTBSY, exactly like an interpreter freshly opened via open_exec() would.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5b432413f7bbbc8b935138490a57be05c1921684 , < c65eb018c12179b5e2c7afe1f0956298576fecec (git)
Affected: bb4715098d8e340bbbdd3a874b31f89867c8067e , < 2bd860b7e752a51185960143cab9fec7bf32c84e (git)
Affected: c152be5adc0975c75cc4f50891c9072d52d60b47 , < eea4b7c7711b1e425272d23352af157f45f4c3e3 (git)
Affected: bf5ed2ef5cdb7b47ce606e3d48ea6eb803b31503 , < 2fdf8b07bee5ef99ec77773a6be05fbb8ee5cdb9 (git)
Affected: 483217fd6f7ccd98b3ed2531a54f75ed144b4499 , < f1e7ea3c8e070f19771cdaef55bbeda1359ad490 (git)
Affected: 0357ef03c94ef835bd44a0658b8edb672a9dbf51 , < 255a758697da87a205e072e0cfc35897b8f743b1 (git)
Affected: 0357ef03c94ef835bd44a0658b8edb672a9dbf51 , < f0edbaf487e4653a680a7abb91c1df94cb7886aa (git)
Affected: 0357ef03c94ef835bd44a0658b8edb672a9dbf51 , < fa5990ca8fd917003e526036bcc50413edb9722c (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (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.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "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": "c65eb018c12179b5e2c7afe1f0956298576fecec",
              "status": "affected",
              "version": "5b432413f7bbbc8b935138490a57be05c1921684",
              "versionType": "git"
            },
            {
              "lessThan": "2bd860b7e752a51185960143cab9fec7bf32c84e",
              "status": "affected",
              "version": "bb4715098d8e340bbbdd3a874b31f89867c8067e",
              "versionType": "git"
            },
            {
              "lessThan": "eea4b7c7711b1e425272d23352af157f45f4c3e3",
              "status": "affected",
              "version": "c152be5adc0975c75cc4f50891c9072d52d60b47",
              "versionType": "git"
            },
            {
              "lessThan": "2fdf8b07bee5ef99ec77773a6be05fbb8ee5cdb9",
              "status": "affected",
              "version": "bf5ed2ef5cdb7b47ce606e3d48ea6eb803b31503",
              "versionType": "git"
            },
            {
              "lessThan": "f1e7ea3c8e070f19771cdaef55bbeda1359ad490",
              "status": "affected",
              "version": "483217fd6f7ccd98b3ed2531a54f75ed144b4499",
              "versionType": "git"
            },
            {
              "lessThan": "255a758697da87a205e072e0cfc35897b8f743b1",
              "status": "affected",
              "version": "0357ef03c94ef835bd44a0658b8edb672a9dbf51",
              "versionType": "git"
            },
            {
              "lessThan": "f0edbaf487e4653a680a7abb91c1df94cb7886aa",
              "status": "affected",
              "version": "0357ef03c94ef835bd44a0658b8edb672a9dbf51",
              "versionType": "git"
            },
            {
              "lessThan": "fa5990ca8fd917003e526036bcc50413edb9722c",
              "status": "affected",
              "version": "0357ef03c94ef835bd44a0658b8edb672a9dbf51",
              "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": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "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": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinfmt_misc: use exe_file_deny_write_access() for the interpreter clone\n\nFor MISC_FMT_OPEN_FILE entries load_misc_binary() clones the\nregistered interpreter file and denies write access to the clone via\nplain deny_write_access(). The clone is installed as\nbprm-\u003einterpreter and later released by the exec machinery through\nexe_file_allow_write_access() which skips the i_writecount increment\nfor files with FMODE_FSNOTIFY_HSM set.\n\nThe deny and allow side can therefore come to different conclusions\nwhen pre-content watches are in play: if a pre-content watch is added\nto the interpreter after registration every subsequent exec through\nthat entry takes a write denial on the clone that is never paired\nwith a write allowance, driving the interpreter inode\u0027s i_writecount\nfurther down with each exec and leaving the interpreter unwritable\neven after the entry and all its users are gone.\n\nTake the write denial via exe_file_deny_write_access() so both sides\nof the pairing base their decision on the same file mode, and\npropagate failure instead of silently ignoring it: an interpreter\nthat is concurrently open for writing now fails the exec with\nETXTBSY, exactly like an interpreter freshly opened via open_exec()\nwould."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:47:25.566Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c65eb018c12179b5e2c7afe1f0956298576fecec"
        },
        {
          "url": "https://git.kernel.org/stable/c/2bd860b7e752a51185960143cab9fec7bf32c84e"
        },
        {
          "url": "https://git.kernel.org/stable/c/eea4b7c7711b1e425272d23352af157f45f4c3e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/2fdf8b07bee5ef99ec77773a6be05fbb8ee5cdb9"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1e7ea3c8e070f19771cdaef55bbeda1359ad490"
        },
        {
          "url": "https://git.kernel.org/stable/c/255a758697da87a205e072e0cfc35897b8f743b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f0edbaf487e4653a680a7abb91c1df94cb7886aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa5990ca8fd917003e526036bcc50413edb9722c"
        }
      ],
      "title": "binfmt_misc: use exe_file_deny_write_access() for the interpreter clone",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74486",
    "datePublished": "2026-08-15T12:27:17.609Z",
    "dateReserved": "2026-08-15T05:44:03.905Z",
    "dateUpdated": "2026-08-23T12:47:25.566Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74486",
      "date": "2026-09-04",
      "epss": "0.00177",
      "percentile": "0.07279"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74486\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T13:17:53.497\",\"lastModified\":\"2026-08-23T13:16:44.640\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbinfmt_misc: use exe_file_deny_write_access() for the interpreter clone\\n\\nFor MISC_FMT_OPEN_FILE entries load_misc_binary() clones the\\nregistered interpreter file and denies write access to the clone via\\nplain deny_write_access(). The clone is installed as\\nbprm-\u003einterpreter and later released by the exec machinery through\\nexe_file_allow_write_access() which skips the i_writecount increment\\nfor files with FMODE_FSNOTIFY_HSM set.\\n\\nThe deny and allow side can therefore come to different conclusions\\nwhen pre-content watches are in play: if a pre-content watch is added\\nto the interpreter after registration every subsequent exec through\\nthat entry takes a write denial on the clone that is never paired\\nwith a write allowance, driving the interpreter inode\u0027s i_writecount\\nfurther down with each exec and leaving the interpreter unwritable\\neven after the entry and all its users are gone.\\n\\nTake the write denial via exe_file_deny_write_access() so both sides\\nof the pairing base their decision on the same file mode, and\\npropagate failure instead of silently ignoring it: an interpreter\\nthat is concurrently open for writing now fails the exec with\\nETXTBSY, exactly like an interpreter freshly opened via open_exec()\\nwould.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/binfmt_misc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5b432413f7bbbc8b935138490a57be05c1921684\",\"lessThan\":\"c65eb018c12179b5e2c7afe1f0956298576fecec\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb4715098d8e340bbbdd3a874b31f89867c8067e\",\"lessThan\":\"2bd860b7e752a51185960143cab9fec7bf32c84e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c152be5adc0975c75cc4f50891c9072d52d60b47\",\"lessThan\":\"eea4b7c7711b1e425272d23352af157f45f4c3e3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bf5ed2ef5cdb7b47ce606e3d48ea6eb803b31503\",\"lessThan\":\"2fdf8b07bee5ef99ec77773a6be05fbb8ee5cdb9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"483217fd6f7ccd98b3ed2531a54f75ed144b4499\",\"lessThan\":\"f1e7ea3c8e070f19771cdaef55bbeda1359ad490\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0357ef03c94ef835bd44a0658b8edb672a9dbf51\",\"lessThan\":\"255a758697da87a205e072e0cfc35897b8f743b1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0357ef03c94ef835bd44a0658b8edb672a9dbf51\",\"lessThan\":\"f0edbaf487e4653a680a7abb91c1df94cb7886aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0357ef03c94ef835bd44a0658b8edb672a9dbf51\",\"lessThan\":\"fa5990ca8fd917003e526036bcc50413edb9722c\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/binfmt_misc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/255a758697da87a205e072e0cfc35897b8f743b1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2bd860b7e752a51185960143cab9fec7bf32c84e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2fdf8b07bee5ef99ec77773a6be05fbb8ee5cdb9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c65eb018c12179b5e2c7afe1f0956298576fecec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eea4b7c7711b1e425272d23352af157f45f4c3e3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f0edbaf487e4653a680a7abb91c1df94cb7886aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1e7ea3c8e070f19771cdaef55bbeda1359ad490\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fa5990ca8fd917003e526036bcc50413edb9722c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-01T10:42:43+00:00",
      "cve": "CVE-2026-74486",
      "id": "CVE-2026-74486",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: binfmt_misc: use exe_file_deny_write_access() for the interpreter clone",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74486.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.