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CVE-2026-89854

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 · fixed in 8c1ebcade6aac58137f2645b579894301febabf3; From fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 · fixed in 1d8bbc4344b9367d9d54731475d745fbc9ea28f2; From fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 · fixed in 2c3b17ee53f034936f7398dbf4d143e608b7c35c; From fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 · fixed in ae09260be7454ed7630a913f147591a25e3a9d09; From fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 · fixed in fcf0804dfe05862007189ac9dc4dc2063be36de1; From fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 · fixed in 8286a9095fb59751fba171afa2b4f590271c87d5; From fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 · fixed in 122bf170c94a3797531b12fee580639a5dc893ed; From fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 · fixed in 33d102102d925357c5fd172dd6672a27d74b3215

  • Linux Linux

    3.14

  • KernelLinux

    From 3.14.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.51; From 6.19.0 · fixed in 7.2.5

References 8

git.kernel.org