{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89854", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.770Z", "datePublished": "2026-09-16T10:31:27.906Z", "dateUpdated": "2026-10-19T08:53:47.075Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:53:47.075Z" }, "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." } ], "metrics": [ { "cvssV3_1": { "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" }, "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->cs84xx without clearing the pointer; a concurrent show() dereferences ha->cs84xx->op_fw_version. This kernel heap UAF lets a reused object be read, enabling arbitrary kernel information disclosure.\nI:H - If the reused object's op_fw_version is zero, show() calls qla84xx_verify_chip(), which takes ha->cs84xx->access_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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/scsi/qla2xxx/qla_os.c" ], "versions": [ { "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7", "lessThan": "8c1ebcade6aac58137f2645b579894301febabf3", "status": "affected", "versionType": "git" }, { "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7", "lessThan": "1d8bbc4344b9367d9d54731475d745fbc9ea28f2", "status": "affected", "versionType": "git" }, { "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7", "lessThan": "2c3b17ee53f034936f7398dbf4d143e608b7c35c", "status": "affected", "versionType": "git" }, { "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7", "lessThan": "ae09260be7454ed7630a913f147591a25e3a9d09", "status": "affected", "versionType": "git" }, { "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7", "lessThan": "fcf0804dfe05862007189ac9dc4dc2063be36de1", "status": "affected", "versionType": "git" }, { "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7", "lessThan": "8286a9095fb59751fba171afa2b4f590271c87d5", "status": "affected", "versionType": "git" }, { "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7", "lessThan": "122bf170c94a3797531b12fee580639a5dc893ed", "status": "affected", "versionType": "git" }, { "version": "fe1b806f4f7172b1eae18ddeebb7d8fb351043f7", "lessThan": "33d102102d925357c5fd172dd6672a27d74b3215", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/scsi/qla2xxx/qla_os.c" ], "versions": [ { "version": "3.14", "status": "affected" }, { "version": "0", "lessThan": "3.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.3" } ] } ] } ], "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" } } } }