Answer in brief
CVE-2026-89891 records a Unknown severity vulnerability in media: em28xx: fix use-after-free of dev_next->devlist on disconnect. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f410b4093fdd4d8f4644d3d486afe3040eceef7b <f61720346fdcc1a2deec59a2f6cbb0cc20d1dc18 || >=f410b4093fdd4d8f4644d3d486afe3040eceef7b <1ed575b1991f68569eb589b7747d3bc26aa6a8a2 || >=f410b4093fdd4d8f4644d3d486afe3040eceef7b <da4b07da6281e39ce4c01e1227e036f3bf600e14 || >=f410b4093fdd4d8f4644d3d486afe3040eceef7b <20aacd87550be297dc39a3f9532dcfff91586510 || >=f410b4093fdd4d8f4644d3d486afe3040eceef7b <20c2c65f3d9f7c278dc9750531d3201ac8bf78b7 || >=f410b4093fdd4d8f4644d3d486afe3040eceef7b <0782807552b6aff41b4656c6c9076a3231d3e79d || >=f410b4093fdd4d8f4644d3d486afe3040eceef7b <16cb1ee17e093175b4d9ae33202f68e5b108cca2 || >=f410b4093fdd4d8f4644d3d486afe3040eceef7b <826915b6b65e2d3251e7248ea54289a22d748c84 | f61720346fdcc1a2deec59a2f6cbb0cc20d1dc18, 1ed575b1991f68569eb589b7747d3bc26aa6a8a2, da4b07da6281e39ce4c01e1227e036f3bf600e14, 20aacd87550be297dc39a3f9532dcfff91586510, 20c2c65f3d9f7c278dc9750531d3201ac8bf78b7, 0782807552b6aff41b4656c6c9076a3231d3e79d, 16cb1ee17e093175b4d9ae33202f68e5b108cca2, 826915b6b65e2d3251e7248ea54289a22d748c84 |
| Linux/Linuxgeneric | 4.17 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
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.
Quoted source text, attributed separately from HOL analysis.