CyberRota Analysis
AI-GeneratedA use-after-free vulnerability exists in the Linux kernel's SCSI qla2xxx driver, specifically related to the handling of the cs84xx chip during host teardown. This flaw can lead to potential exploitation if a concurrent read occurs on the host's sysfs attribute after the chip reference has been freed, potentially allowing unauthorized access to memory. Organizations using affected Linux systems, particularly those relying on SCSI qla2xxx drivers, should prioritize patching to mitigate the risk of exploitation.
Original NVD 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.