CVE-2026-89854
scsi: qla2xxx: Fix cs84xx use-after-free on host teardown
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.
INFO
Published Date :
Sept. 16, 2026, 11:16 a.m.
Last Modified :
Sept. 16, 2026, 3:18 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Move qla84xx_put_chip() after scsi_remove_host().
- Apply patches to the Linux kernel.
References to Advisories, Solutions, and Tools
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CVE-2026-89854.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-89854 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-89854
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 16, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 16, 2026
Action Type Old Value New Value Added 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89854.json">CVE-2026-89854</a> Added Reference https://git.kernel.org/stable/c/122bf170c94a3797531b12fee580639a5dc893ed Added Reference https://git.kernel.org/stable/c/1d8bbc4344b9367d9d54731475d745fbc9ea28f2 Added Reference https://git.kernel.org/stable/c/2c3b17ee53f034936f7398dbf4d143e608b7c35c Added Reference https://git.kernel.org/stable/c/33d102102d925357c5fd172dd6672a27d74b3215 Added Reference https://git.kernel.org/stable/c/8286a9095fb59751fba171afa2b4f590271c87d5 Added Reference https://git.kernel.org/stable/c/8c1ebcade6aac58137f2645b579894301febabf3 Added Reference https://git.kernel.org/stable/c/ae09260be7454ed7630a913f147591a25e3a9d09 Added Reference https://git.kernel.org/stable/c/fcf0804dfe05862007189ac9dc4dc2063be36de1