Linux Kernel up to 7.2.4 qla2xxx qla84xx_put_chip use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.00

Summaryinfo

A vulnerability described as very critical has been identified in Linux Kernel up to 7.2.4. The impacted element is the function qla84xx_put_chip of the component qla2xxx. Executing a manipulation can lead to use after free. This vulnerability is handled as CVE-2026-89854. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.2.4. This vulnerability affects the function qla84xx_put_chip of the component qla2xxx. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-89854 since 09/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/16/2026).

Upgrading to version 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5 or 7.3-rc1 eliminates this vulnerability. Applying the patch 8c1ebcade6aac58137f2645b579894301febabf3/1d8bbc4344b9367d9d54731475d745fbc9ea28f2/2c3b17ee53f034936f7398dbf4d143e608b7c35c/ae09260be7454ed7630a913f147591a25e3a9d09/fcf0804dfe05862007189ac9dc4dc2063be36de1/8286a9095fb59751fba171afa2b4f590271c87d5/122bf170c94a3797531b12fee580639a5dc893ed/33d102102d925357c5fd172dd6672a27d74b3215 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

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Name

Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.270/5.15.221/6.1.188/6.6.157/6.12.110/6.18.51/7.2.5/7.3-rc1
Patch: 8c1ebcade6aac58137f2645b579894301febabf3/1d8bbc4344b9367d9d54731475d745fbc9ea28f2/2c3b17ee53f034936f7398dbf4d143e608b7c35c/ae09260be7454ed7630a913f147591a25e3a9d09/fcf0804dfe05862007189ac9dc4dc2063be36de1/8286a9095fb59751fba171afa2b4f590271c87d5/122bf170c94a3797531b12fee580639a5dc893ed/33d102102d925357c5fd172dd6672a27d74b3215

Timelineinfo

09/11/2026 CVE reserved
09/16/2026 +5 days Advisory disclosed
09/16/2026 +0 days VulDB entry created
09/16/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-89854 (🔒)
GCVE (CVE): GCVE-0-2026-89854
GCVE (VulDB): GCVE-100-405676

Entryinfo

Created: 09/16/2026 13:40
Changes: 09/16/2026 13:40 (59)
Complete: 🔍
Cache ID: 216::103

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