CVE-2025-40275
ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd
Reported by linux · Published December 6, 2025
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd In snd_usb_create_streams(), for UAC version 3 devices, the Interface Association Descriptor (IAD) is retrieved via usb_ifnum_to_if(). If this call fails, a fallback routine attempts to obtain the IAD from the next interface and sets a BADD profile. However, snd_usb_mixer_controls_badd() assumes that the IAD retrieved from usb_ifnum_to_if() is always valid, without performing a NULL check. This can lead to a NULL pointer dereference when usb_ifnum_to_if() fails to find the interface descriptor. This patch adds a NULL pointer check after calling usb_ifnum_to_if() in snd_usb_mixer_controls_badd() to prevent the dereference. This issue was discovered by syzkaller, which triggered the bug by sending a crafted USB device descriptor.
EPSS 0.19% · 9.3th percentile
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| linux_kernel | linux | 6.18, 6.17.9, 6.12.59, 6.6.117, 6.1.159, 5.15.197, 5.10.247, 5.4.302 |
| Linux | Linux | cbdbfc756f2990942138ed0138da9303b4dbf9ff, c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6, 9f282104627be5fbded3102ff9004f753c55a063, 85568535893600024d7d8794f4f8b6428b521e0c, 632108ec072ad64c8c83db6e16a7efee29ebfb74, 57f607c112966c21240c424b33e2cb71e121dcf0, 2762d3ea9c929ca4094541ca517c317ffa94625b, 23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 17156f23e93c0f59e06dd2aaffd06221341caaee, 17156f23e93c0f59e06dd2aaffd06221341caaee, 17156f23e93c0f59e06dd2aaffd06221341caaee |
| Linux | Linux | 4.18, 0, 5.4.302 |
| linux | linux_kernel | 4.18, 4.18, 4.18 |
| Linux | Linux | 17156f23e93c0f59e06dd2aaffd06221341caaee, 17156f23e93c0f59e06dd2aaffd06221341caaee, 17156f23e93c0f59e06dd2aaffd06221341caaee |
Timeline
- Dec 6, 2025 CVE Published
- Dec 7, 2025 EPSS Score (30 in total, the first dated here)
- Mar 29, 2026 Distribution Patch (182 in total, the first dated here)
- Mar 29, 2026 Security Advisory (221 in total, the first dated here)
- Jun 8, 2026 Coalition ESS Score
- Jun 17, 2026 CVE Updated
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