Answer in brief
CVE-2025-39997 records a Unknown severity vulnerability in ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (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), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=06513dd6d32c37d0364db8488cfdf3e14da238a8 <e63f049c7764b615d1d50cb486745fa63372b42d || >=efaf61052b8ff9ee8968912fbaf02c2847c78ede <e16985513e89466a236d2a7c202783b4dd0c5a46 || >=647410a7da46067953a53c0d03f8680eff570959 <dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba || >=c611b9e55174e439dcd85a72969b43a95f3827a4 <647d6b8d22be12842fde6ed0c56859ebc615f21e || >=0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 <af600e7f5526d16146b3ae99f6ad57bfea79ca33 || >=0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 <353d8c715cc951a980728133c9dd64ca5a0a186c || >=0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 <9f2c0ac1423d5f267e7f1d1940780fc764b0fee3 || 62066758d2ae169278e5d6aea5995b1b6f6ddeb5 || >=6.1.167 <6.1.175 || >=6.15.3 <6.16 | e63f049c7764b615d1d50cb486745fa63372b42d, e16985513e89466a236d2a7c202783b4dd0c5a46, dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba, 647d6b8d22be12842fde6ed0c56859ebc615f21e, af600e7f5526d16146b3ae99f6ad57bfea79ca33, 353d8c715cc951a980728133c9dd64ca5a0a186c, 9f2c0ac1423d5f267e7f1d1940780fc764b0fee3, 6.1.175, 6.16 |
| Linux/Linuxgeneric | 6.16 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Oct 15, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free The previous commit 0718a78f6a9f ("ALSA: usb-audio: Kill timer properly at removal") patched a UAF issue caused by the error timer. However, because the error timer kill added in this patch occurs after the endpoint delete, a race condition to UAF still occurs, albeit rarely. Additionally, since kill-cleanup for urb is also missing, freed memory can be accessed in interrupt context related to urb, which can cause UAF. Therefore, to prevent this, error timer and urb must be killed before freeing the heap memory.
Quoted source text, attributed separately from HOL analysis.