CVE-2025-40275
Description
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.
How to fix
- Linux Linux23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4, c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6, 9f282104627be5fbded3102ff9004f753c55a063, 2762d3ea9c929ca4094541ca517c317ffa94625b, 57f607c112966c21240c424b33e2cb71e121dcf0, cbdbfc756f2990942138ed0138da9303b4dbf9ff, 85568535893600024d7d8794f4f8b6428b521e0c, 632108ec072ad64c8c83db6e16a7efee29ebfb74 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 17156f23e93c0f59e06dd2aaffd06221341caaee ≤ v < 23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4, 17156f23e93c0f59e06dd2aaffd06221341caaee ≤ v < c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6, 17156f23e93c0f59e06dd2aaffd06221341caaee ≤ v < 9f282104627be5fbded3102ff9004f753c55a063, 17156f23e93c0f59e06dd2aaffd06221341caaee ≤ v < 2762d3ea9c929ca4094541ca517c317ffa94625b, 17156f23e93c0f59e06dd2aaffd06221341caaee ≤ v < 57f607c112966c21240c424b33e2cb71e121dcf0, 17156f23e93c0f59e06dd2aaffd06221341caaee ≤ v < cbdbfc756f2990942138ed0138da9303b4dbf9ff, 17156f23e93c0f59e06dd2aaffd06221341caaee ≤ v < 85568535893600024d7d8794f4f8b6428b521e0c, 17156f23e93c0f59e06dd2aaffd06221341caaee ≤ v < 632108ec072ad64c8c83db6e16a7efee29ebfb74, 4.18 | 23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4, c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6, 9f282104627be5fbded3102ff9004f753c55a063, 2762d3ea9c929ca4094541ca517c317ffa94625b, 57f607c112966c21240c424b33e2cb71e121dcf0, cbdbfc756f2990942138ed0138da9303b4dbf9ff, 85568535893600024d7d8794f4f8b6428b521e0c, 632108ec072ad64c8c83db6e16a7efee29ebfb74 |
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