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CVE-2026-23221 (GCVE-0-2026-23221)

Vulnerability from cvelistv5 – Published: 2026-02-18 14:53 – Updated: 2026-05-11 22:02
VLAI
Title
bus: fsl-mc: fix use-after-free in driver_override_show()
Summary
In the Linux kernel, the following vulnerability has been resolved: bus: fsl-mc: fix use-after-free in driver_override_show() The driver_override_show() function reads the driver_override string without holding the device_lock. However, driver_override_store() uses driver_set_override(), which modifies and frees the string while holding the device_lock. This can result in a concurrent use-after-free if the string is freed by the store function while being read by the show function. Fix this by holding the device_lock around the read operation.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d , < c71dfb7833db7af652ee8f65011f14c97c47405d (git)
Affected: 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d , < c424e72cfa67e7e1477035058a8a659f2c0ea637 (git)
Affected: 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d , < b1983840287303e0dfb401b1b6cecc5ea7471e90 (git)
Affected: 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d , < dd8ba8c0c3f3916d4ee1e3a09da9cd5caff5d227 (git)
Affected: 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d , < 1d6bd6183e723a7b256ff34bbb5b498b5f4f2ec0 (git)
Affected: 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d , < a2ae33e1c6361e960a4d00f7cf75d880b54f9528 (git)
Affected: 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d , < 148891e95014b5dc5878acefa57f1940c281c431 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.15.201 , ≤ 5.15.* (semver)
Unaffected: 6.1.164 , ≤ 6.1.* (semver)
Unaffected: 6.6.127 , ≤ 6.6.* (semver)
Unaffected: 6.12.74 , ≤ 6.12.* (semver)
Unaffected: 6.18.11 , ≤ 6.18.* (semver)
Unaffected: 6.19.1 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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        }
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However, driver_override_store() uses\\ndriver_set_override(), which modifies and frees the string while holding\\nthe device_lock.\\n\\nThis can result in a concurrent use-after-free if the string is freed\\nby the store function while being read by the show function.\\n\\nFix this by holding the device_lock around the read operation.\"},{\"lang\":\"es\",\"value\":\"Se ha resuelto la siguiente vulnerabilidad en el kernel de Linux:\\n\\nbus: fsl-mc: correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en driver_override_show()\\n\\nLa funci\u00f3n driver_override_show() lee la cadena driver_override sin mantener el device_lock. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:27:43+00:00",
      "cve": "CVE-2026-23221",
      "id": "CVE-2026-23221",
      "initial_release_date": "2026-02-18T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bus: fsl-mc: fix use-after-free in driver_override_show()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23221.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:31:11Z",
      "cve": "CVE-2026-23221",
      "id": "CVE-2026-23221",
      "initial_release_date": "2026-02-19T00:26:35Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "561",
      "product_status:known_not_affected": "91",
      "product_status:recommended": "272",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23221",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23221.json",
      "version": "26"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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