CVE-2026-89891
UnknownSummary
In the Linux kernel media em28xx driver, when a device with has_dual_ts=1 takes the is_audio_only path, both dev and dev->dev_next are added to the global em28xx_devlist. During disconnect, em28xx_close_extension(dev) only removes dev->devlist, leaving dev->dev_next->devlist linked in the global list, which after dev_next is freed leads to a dangling pointer and list corruption.
Risk Assessment
Kernel list corruption can lead to system panic or potential exploitation for privilege escalation.
Recommendation
Update the Linux kernel to a version with the fix that removes dev->dev_next->devlist from the global list in em28xx_close_extension() before the device is freed.
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Original NVD description (English source)
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 em28xx interprets as a vendor audio endpoint, enabling the is_audio_only + has_dual_ts code path that was previously unreachable with such descriptors. Fix this by removing dev->dev_next->devlist from the global list in em28xx_close_extension() before the device is freed.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS