Answer in brief
CVE-2026-89736 records a High severity (CVSS 7.8) vulnerability in usb: gadget: u_audio: Fix use-after-free on sound card disconnect. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), 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.
CVSS is 7.8. 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), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=6c67ed9ad9b83e453e808f9b31a931a20a25629b <c74ff0b1a0fca53d3ac185873c87d6a719b30a47 || >=6c67ed9ad9b83e453e808f9b31a931a20a25629b <4e747c864a88537e18b1ffc19a1954c9686bb8e1 || >=6c67ed9ad9b83e453e808f9b31a931a20a25629b <79a92896e2bb9471550c56fc23d8d93592f04c27 || >=6c67ed9ad9b83e453e808f9b31a931a20a25629b <858965947081d10d41d9a1010a540d3d5eea958b || 3e016ef2e72da93a2ea7afbb45de1b481b44d761 || 3256e152b645fc1e788ba44c2d8ced690113e3e6 || 0eda2004f38d95ef5715d62be884cd344260535b || 33f341c1fc60e172a3515c51bdabee11e83d1ee9 || b131989797f7287d7fdadb2bababc05a15d44750 || 3bc7324e4911351e39c54a62e6ca46321cb10faf || 43ca70753dfffd517d2af126da28690f8f615605 || >=4.14.312 <4.15 || >=4.19.280 <4.20 || >=5.4.240 <5.5 || >=5.10.177 <5.11 || >=5.15.105 <5.16 || >=6.1.22 <6.2 || >=6.2.9 <6.3 | c74ff0b1a0fca53d3ac185873c87d6a719b30a47, 4e747c864a88537e18b1ffc19a1954c9686bb8e1, 79a92896e2bb9471550c56fc23d8d93592f04c27, 858965947081d10d41d9a1010a540d3d5eea958b, 4.15, 4.20, 5.5, 5.11, 5.16, 6.2, 6.3 |
| Linux/Linuxgeneric | 6.3 | Not reported |
| Linux/Linuxgeneric | >=33f341c1fc60e172a3515c51bdabee11e83d1ee9 <a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82 || >=b131989797f7287d7fdadb2bababc05a15d44750 <f983793f03148b097977f200298db215cd2d4438 || >=3bc7324e4911351e39c54a62e6ca46321cb10faf <6f46762196f04464e1050a9ee94e72b917db9010 || >=6c67ed9ad9b83e453e808f9b31a931a20a25629b <891a8d11f4d5eb50b2ce7570f4f98204a7a57493 || >=6c67ed9ad9b83e453e808f9b31a931a20a25629b <c74ff0b1a0fca53d3ac185873c87d6a719b30a47 || >=6c67ed9ad9b83e453e808f9b31a931a20a25629b <4e747c864a88537e18b1ffc19a1954c9686bb8e1 || >=6c67ed9ad9b83e453e808f9b31a931a20a25629b <79a92896e2bb9471550c56fc23d8d93592f04c27 || >=6c67ed9ad9b83e453e808f9b31a931a20a25629b <858965947081d10d41d9a1010a540d3d5eea958b || 3e016ef2e72da93a2ea7afbb45de1b481b44d761 || 3256e152b645fc1e788ba44c2d8ced690113e3e6 || 0eda2004f38d95ef5715d62be884cd344260535b || 43ca70753dfffd517d2af126da28690f8f615605 || >=5.10.177 <5.10.270 || >=5.15.105 <5.15.221 || >=6.1.22 <6.1.188 || >=4.14.312 <4.15 || >=4.19.280 <4.20 || >=5.4.240 <5.5 || >=6.2.9 <6.3 | a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82, f983793f03148b097977f200298db215cd2d4438, 6f46762196f04464e1050a9ee94e72b917db9010, 891a8d11f4d5eb50b2ce7570f4f98204a7a57493, c74ff0b1a0fca53d3ac185873c87d6a719b30a47, 4e747c864a88537e18b1ffc19a1954c9686bb8e1, 79a92896e2bb9471550c56fc23d8d93592f04c27, 858965947081d10d41d9a1010a540d3d5eea958b, 5.10.270, 5.15.221, 6.1.188, 4.15, 4.20, 5.5, 6.3 |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_audio: Fix use-after-free on sound card disconnect g_audio_cleanup() invokes snd_card_free_when_closed() to initiate sound card teardown and immediately frees the underlying struct snd_uac_chip context. However, snd_card_free_when_closed() returns asynchronously while ALSA control elements (kctls) remain open in userspace. When userspace control applications access or close these open file descriptors, kctl callbacks attempt to dereference kctl->private_data pointing to &uac->c_prm or &uac->p_prm within the freed uac structure, resulting in a use-after-free (UAF) memory corruption. Fix this issue by deferring the destruction of struct snd_uac_chip until all references to the ALSA sound card are released. Register a custom card->private_free callback (u_audio_card_free) during g_audio_setup() that frees uac and its associated playback/capture request and ring buffers only when the sound card reference count drops to zero.
Quoted source text, attributed separately from HOL analysis.