CVE-2026-89854

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.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/122bf170c94a3797531b12fee580639a5dc893ed
https://git.kernel.org/stable/c/1d8bbc4344b9367d9d54731475d745fbc9ea28f2
https://git.kernel.org/stable/c/2c3b17ee53f034936f7398dbf4d143e608b7c35c
https://git.kernel.org/stable/c/33d102102d925357c5fd172dd6672a27d74b3215
https://git.kernel.org/stable/c/8286a9095fb59751fba171afa2b4f590271c87d5
https://git.kernel.org/stable/c/8c1ebcade6aac58137f2645b579894301febabf3
https://git.kernel.org/stable/c/ae09260be7454ed7630a913f147591a25e3a9d09
https://git.kernel.org/stable/c/fcf0804dfe05862007189ac9dc4dc2063be36de1

Configurations

No configuration.

History

16 Sep 2026, 15:18

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.8

Information

Published : 2026-09-16 11:16

Updated : 2026-09-16 15:18

NVD link : CVE-2026-89854

Mitre link : CVE-2026-89854

CVE.ORG link : CVE-2026-89854

JSON object : View

Products Affected

No product.

CWE

No CWE.

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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."}], "lastModified": "2026-09-16T15:18:13.367", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}