{"api_version":"1","generated_at":"2026-09-17T13:39:24+00:00","cve":"CVE-2026-89854","urls":{"html":"https://cve.report/CVE-2026-89854","api":"https://cve.report/api/cve/CVE-2026-89854.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89854","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89854"},"summary":{"title":"scsi: qla2xxx: Fix cs84xx use-after-free on host teardown","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-16 11:16:53","updated_at":"2026-09-16 15:18:13"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/2c3b17ee53f034936f7398dbf4d143e608b7c35c","name":"https://git.kernel.org/stable/c/2c3b17ee53f034936f7398dbf4d143e608b7c35c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8c1ebcade6aac58137f2645b579894301febabf3","name":"https://git.kernel.org/stable/c/8c1ebcade6aac58137f2645b579894301febabf3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ae09260be7454ed7630a913f147591a25e3a9d09","name":"https://git.kernel.org/stable/c/ae09260be7454ed7630a913f147591a25e3a9d09","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1d8bbc4344b9367d9d54731475d745fbc9ea28f2","name":"https://git.kernel.org/stable/c/1d8bbc4344b9367d9d54731475d745fbc9ea28f2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fcf0804dfe05862007189ac9dc4dc2063be36de1","name":"https://git.kernel.org/stable/c/fcf0804dfe05862007189ac9dc4dc2063be36de1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8286a9095fb59751fba171afa2b4f590271c87d5","name":"https://git.kernel.org/stable/c/8286a9095fb59751fba171afa2b4f590271c87d5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/122bf170c94a3797531b12fee580639a5dc893ed","name":"https://git.kernel.org/stable/c/122bf170c94a3797531b12fee580639a5dc893ed","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/33d102102d925357c5fd172dd6672a27d74b3215","name":"https://git.kernel.org/stable/c/33d102102d925357c5fd172dd6672a27d74b3215","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89854","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89854","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 8c1ebcade6aac58137f2645b579894301febabf3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 1d8bbc4344b9367d9d54731475d745fbc9ea28f2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 2c3b17ee53f034936f7398dbf4d143e608b7c35c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 ae09260be7454ed7630a913f147591a25e3a9d09 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 fcf0804dfe05862007189ac9dc4dc2063be36de1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 8286a9095fb59751fba171afa2b4f590271c87d5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 122bf170c94a3797531b12fee580639a5dc893ed git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 33d102102d925357c5fd172dd6672a27d74b3215 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.270 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.51 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.5 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"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-rc1","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-rc1","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->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":{"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->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."}]}],"providerMetadata":{"dateUpdated":"2026-09-16T14:39:19.342Z","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":"2026-09-16T14:39:19.342Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 11:16:53","lastModifiedDate":"2026-09-16 15:18:13","problem_types":[],"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}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89854","Ordinal":"1","Title":"scsi: qla2xxx: Fix cs84xx use-after-free on host teardown","CVE":"CVE-2026-89854","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89854","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"scsi: qla2xxx: Fix cs84xx use-after-free on host teardown"}]}}}