CVE-2026-89854 (GCVE-0-2026-89854)
Vulnerability from cvelistv5
Published
2026-09-16 10:31
Modified
2026-10-19 08:53
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: fe1b806f4f7172b1eae18ddeebb7d8fb351043f7
Version: fe1b806f4f7172b1eae18ddeebb7d8fb351043f7
Version: fe1b806f4f7172b1eae18ddeebb7d8fb351043f7
Version: fe1b806f4f7172b1eae18ddeebb7d8fb351043f7
Version: fe1b806f4f7172b1eae18ddeebb7d8fb351043f7
Version: fe1b806f4f7172b1eae18ddeebb7d8fb351043f7
Version: fe1b806f4f7172b1eae18ddeebb7d8fb351043f7
Version: fe1b806f4f7172b1eae18ddeebb7d8fb351043f7
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/qla2xxx/qla_os.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8c1ebcade6aac58137f2645b579894301febabf3",
              "status": "affected",
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "versionType": "git"
            },
            {
              "lessThan": "1d8bbc4344b9367d9d54731475d745fbc9ea28f2",
              "status": "affected",
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "versionType": "git"
            },
            {
              "lessThan": "2c3b17ee53f034936f7398dbf4d143e608b7c35c",
              "status": "affected",
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "versionType": "git"
            },
            {
              "lessThan": "ae09260be7454ed7630a913f147591a25e3a9d09",
              "status": "affected",
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "versionType": "git"
            },
            {
              "lessThan": "fcf0804dfe05862007189ac9dc4dc2063be36de1",
              "status": "affected",
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "versionType": "git"
            },
            {
              "lessThan": "8286a9095fb59751fba171afa2b4f590271c87d5",
              "status": "affected",
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "versionType": "git"
            },
            {
              "lessThan": "122bf170c94a3797531b12fee580639a5dc893ed",
              "status": "affected",
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "versionType": "git"
            },
            {
              "lessThan": "33d102102d925357c5fd172dd6672a27d74b3215",
              "status": "affected",
              "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/qla2xxx/qla_os.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.14"
            },
            {
              "lessThan": "3.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003ecs84xx and frees it via\n__qla84xx_chip_release() without clearing ha-\u003ecs84xx. 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-\u003ecs84xx, 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is reached from qla24xx_84xx_fw_version_show() on the SCSI host sysfs attribute while qla2x00_remove_one() tears down a QLogic ISP8432 (84xx) HBA. That is a local sysfs/PCI-unbind path, not a network or Fibre Channel frame handler.\nAC:L - An attacker can loop-read /sys/class/scsi_host/hostN/84xx_fw_version while teardown runs. qla84xx_put_chip() freed cs84xx before scsi_remove_host(), leaving a large window through timer stop, DMA free, workqueue destroy, and fc_remove_host(). The attacker controls the sysfs side and can retry.\nPR:L - 84xx_fw_version is DEVICE_ATTR(..., S_IRUGO) with no capable() check in qla24xx_84xx_fw_version_show(), so an unprivileged local user can read it. Per CNA driver-removal UAF precedent, concurrent PCI unbind or rmmod does not require the attacker to hold init-namespace root.\nUI:N - The attacker performs their own sysfs reads against 84xx_fw_version and can race routine driver unbind, rmmod, or PCI hot-remove. No separate victim action such as mounting a filesystem or confirming a prompt is required.\nS:U - The use-after-free corrupts the host kernel heap object qla_chip_state_84xx within the same kernel security authority. It is not a VM escape, IOMMU/DMA isolation bypass, or sandbox breakout.\nC:H - qla84xx_put_chip() kfree()s ha-\u003ecs84xx without clearing the pointer; a concurrent show() dereferences ha-\u003ecs84xx-\u003eop_fw_version. This kernel heap UAF lets a reused object be read, enabling arbitrary kernel information disclosure.\nI:H - If the reused object\u0027s op_fw_version is zero, show() calls qla84xx_verify_chip(), which takes ha-\u003ecs84xx-\u003eaccess_lock and writes op_fw_version on the freed object. Heap spraying that UAF yields arbitrary write and control-flow hijack primitives.\nA:H - Dereferencing the freed cs84xx pointer from sysfs context oopses or panics the kernel even when the UAF is not fully converted into a read/write primitive, so availability impact is complete."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:53:47.075Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8c1ebcade6aac58137f2645b579894301febabf3"
        },
        {
          "url": "https://git.kernel.org/stable/c/1d8bbc4344b9367d9d54731475d745fbc9ea28f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c3b17ee53f034936f7398dbf4d143e608b7c35c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae09260be7454ed7630a913f147591a25e3a9d09"
        },
        {
          "url": "https://git.kernel.org/stable/c/fcf0804dfe05862007189ac9dc4dc2063be36de1"
        },
        {
          "url": "https://git.kernel.org/stable/c/8286a9095fb59751fba171afa2b4f590271c87d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/122bf170c94a3797531b12fee580639a5dc893ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/33d102102d925357c5fd172dd6672a27d74b3215"
        }
      ],
      "title": "scsi: qla2xxx: Fix cs84xx use-after-free on host teardown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89854",
    "datePublished": "2026-09-16T10:31:27.906Z",
    "dateReserved": "2026-09-11T19:38:34.770Z",
    "dateUpdated": "2026-10-19T08:53:47.075Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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