CVE-2026-89854 (CVSS 7.8)

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Other References

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

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89854? +

CVE-2026-89854 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2026-89854? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-89854

Description

CVSS v3.1 Score

References

Other References

Frequently Asked Questions

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