scsi: qla2xxx: Fix cs84xx use-after-free on host teardown

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89854
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:16:53 UTC
Updated2026-09-16 15:18:13 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 8c1ebcade6aac58137f2645b579894301febabf3 git Not specified
CNA Linux Linux affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 1d8bbc4344b9367d9d54731475d745fbc9ea28f2 git Not specified
CNA Linux Linux affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 2c3b17ee53f034936f7398dbf4d143e608b7c35c git Not specified
CNA Linux Linux affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 ae09260be7454ed7630a913f147591a25e3a9d09 git Not specified
CNA Linux Linux affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 fcf0804dfe05862007189ac9dc4dc2063be36de1 git Not specified
CNA Linux Linux affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 8286a9095fb59751fba171afa2b4f590271c87d5 git Not specified
CNA Linux Linux affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 122bf170c94a3797531b12fee580639a5dc893ed git Not specified
CNA Linux Linux affected fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 33d102102d925357c5fd172dd6672a27d74b3215 git Not specified
CNA Linux Linux affected 3.14 Not specified
CNA Linux Linux unaffected 3.14 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2c3b17ee53f034936f7398dbf4d143e608b7c35c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8c1ebcade6aac58137f2645b579894301febabf3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ae09260be7454ed7630a913f147591a25e3a9d09 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1d8bbc4344b9367d9d54731475d745fbc9ea28f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fcf0804dfe05862007189ac9dc4dc2063be36de1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8286a9095fb59751fba171afa2b4f590271c87d5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/122bf170c94a3797531b12fee580639a5dc893ed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/33d102102d925357c5fd172dd6672a27d74b3215 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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