CVE-2026-89891

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

media: em28xx: fix use-after-free of dev_next->devlist on disconnect

When a device with has_dual_ts=1 is probed and the is_audio_only path

is taken, both dev and dev->dev_next are added to the global

em28xx_devlist via em28xx_init_extension(). However, during disconnect,

em28xx_close_extension(dev) only calls list_del(&dev->devlist), leaving

dev->dev_next->devlist still linked in the global list. When dev_next is

subsequently freed via kref_put(), its devlist entry becomes a dangling

pointer in em28xx_devlist. The next device probe that calls

em28xx_init_extension() triggers a list corruption BUG when list_add_tail

detects the freed node.

This bug was exposed by commit a368ecde8a50 ("USB: core: Fix duplicate

endpoint bug by clearing reserved bits in the descriptor") which clears

reserved bits in bEndpointAddress during endpoint parsing. This causes

fuzzed endpoint addresses like 0xf3 to be normalized to 0x83, which

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References