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CVE-2025-40275

UnknownEPSS 0.17%

Last modified

CVE-2025-40275 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.17%

6.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 17156f23e93c0f59e06dd2aaffd06221341caaee, < 23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4; >= 17156f23e93c0f59e06dd2aaffd06221341caaee, < c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6; >= 17156f23e93c0f59e06dd2aaffd06221341caaee, < 9f282104627be5fbded3102ff9004f753c55a063; >= 17156f23e93c0f59e06dd2aaffd06221341caaee, < 2762d3ea9c929ca4094541ca517c317ffa94625b; >= 17156f23e93c0f59e06dd2aaffd06221341caaee, < 57f607c112966c21240c424b33e2cb71e121dcf0; >= 17156f23e93c0f59e06dd2aaffd06221341caaee, < cbdbfc756f2990942138ed0138da9303b4dbf9ff; >= 17156f23e93c0f59e06dd2aaffd06221341caaee, < 85568535893600024d7d8794f4f8b6428b521e0c; >= 17156f23e93c0f59e06dd2aaffd06221341caaee, < 632108ec072ad64c8c83db6e16a7efee29ebfb74
LinuxLinux4.18

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is CVE-2025-40275?
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 severe is CVE-2025-40275?
Severity scoring for CVE-2025-40275 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2025-40275?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST