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CVE-2026-89854

HIGHCVSS 7.8/10

Last modified

CVE-2026-89854 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.

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.

Metrics

CVSS 3.1
7.8/10

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

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= fe1b806f4f7172b1eae18ddeebb7d8fb351043f7, < 8c1ebcade6aac58137f2645b579894301febabf3; >= fe1b806f4f7172b1eae18ddeebb7d8fb351043f7, < 1d8bbc4344b9367d9d54731475d745fbc9ea28f2; >= fe1b806f4f7172b1eae18ddeebb7d8fb351043f7, < 2c3b17ee53f034936f7398dbf4d143e608b7c35c; >= fe1b806f4f7172b1eae18ddeebb7d8fb351043f7, < ae09260be7454ed7630a913f147591a25e3a9d09; >= fe1b806f4f7172b1eae18ddeebb7d8fb351043f7, < fcf0804dfe05862007189ac9dc4dc2063be36de1; >= fe1b806f4f7172b1eae18ddeebb7d8fb351043f7, < 8286a9095fb59751fba171afa2b4f590271c87d5; >= fe1b806f4f7172b1eae18ddeebb7d8fb351043f7, < 122bf170c94a3797531b12fee580639a5dc893ed; >= fe1b806f4f7172b1eae18ddeebb7d8fb351043f7, < 33d102102d925357c5fd172dd6672a27d74b3215
LinuxLinux3.14

References

Timeline

Published
Last Modified
Status
Received

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.
How severe is CVE-2026-89854?
CVE-2026-89854 has a CVSS score of 7.8/10 (HIGH severity).
How do I fix CVE-2026-89854?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST