CVE-2026-89854

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Fix cs84xx use-after-free on host teardown qla84xx_put_chip() drops the last reference to ha->cs84xx and frees it via __qla84xx_chip_release() without clearing ha->cs84xx. During teardown it ran before scsi_remove_host(), which is what removes the 84xx_fw_version host sysfs attribute. A concurrent read of that attribute in the window between the two calls executes qla24xx_84xx_fw_version_show(), which dereferences the freed ha->cs84xx, resulting in a use-after-free. Move qla84xx_put_chip() to after scsi_remove_host() in both qla2x00_remove_one() and qla2x00_disable_board_on_pci_error(). Once scsi_remove_host() returns, the sysfs attribute is gone and kernfs has drained any in-flight show(), so no reader can touch cs84xx; the put still runs before the host and ha are freed.

Severity

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-16 11:16:53.180000

Last modified

2026-10-19 09:18:29.693000

View original CVE JSON

{
  "id": "CVE-2026-89854",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-16T11:16:53.180",
  "lastModified": "2026-10-19T09:18:29.693",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: qla2xxx: Fix cs84xx use-after-free on host teardown\n\nqla84xx_put_chip() drops the last reference to ha->cs84xx and frees it via\n__qla84xx_chip_release() without clearing ha->cs84xx. During teardown it ran\nbefore scsi_remove_host(), which is what removes the 84xx_fw_version host\nsysfs attribute. A concurrent read of that attribute in the window between\nthe two calls executes qla24xx_84xx_fw_version_show(), which dereferences\nthe freed ha->cs84xx, resulting in a use-after-free.\n\nMove qla84xx_put_chip() to after scsi_remove_host() in both\nqla2x00_remove_one() and qla2x00_disable_board_on_pci_error(). Once\nscsi_remove_host() returns, the sysfs attribute is gone and kernfs has\ndrained any in-flight show(), so no reader can touch cs84xx; the put still\nruns before the host and ha are freed."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/scsi/qla2xxx/qla_os.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "lessThan": "8c1ebcade6aac58137f2645b579894301febabf3",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "lessThan": "1d8bbc4344b9367d9d54731475d745fbc9ea28f2",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "lessThan": "2c3b17ee53f034936f7398dbf4d143e608b7c35c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "lessThan": "ae09260be7454ed7630a913f147591a25e3a9d09",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "lessThan": "fcf0804dfe05862007189ac9dc4dc2063be36de1",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "lessThan": "8286a9095fb59751fba171afa2b4f590271c87d5",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "lessThan": "122bf170c94a3797531b12fee580639a5dc893ed",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "lessThan": "33d102102d925357c5fd172dd6672a27d74b3215",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/scsi/qla2xxx/qla_os.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "3.14",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "3.14",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.270",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.221",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.188",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.110",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.51",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.5",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/122bf170c94a3797531b12fee580639a5dc893ed",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1d8bbc4344b9367d9d54731475d745fbc9ea28f2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2c3b17ee53f034936f7398dbf4d143e608b7c35c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/33d102102d925357c5fd172dd6672a27d74b3215",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8286a9095fb59751fba171afa2b4f590271c87d5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8c1ebcade6aac58137f2645b579894301febabf3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ae09260be7454ed7630a913f147591a25e3a9d09",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fcf0804dfe05862007189ac9dc4dc2063be36de1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}