ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 5 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.18 and later | 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.59, 6.17.9, 6.18 | Patch available | CNA |
- Linux VendorLinux Affected 4.18 and later Fixed in 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.59, 6.17.9, 6.18 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.59, 6.17.9, 6.18
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-40275
- 2026-10-03 Alias added: GHSA-x49w-vx84-7x88
References
Other 8
- https://git.kernel.org/stable/c/23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4
- https://git.kernel.org/stable/c/c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6
- https://git.kernel.org/stable/c/9f282104627be5fbded3102ff9004f753c55a063
- https://git.kernel.org/stable/c/2762d3ea9c929ca4094541ca517c317ffa94625b
- https://git.kernel.org/stable/c/57f607c112966c21240c424b33e2cb71e121dcf0
- https://git.kernel.org/stable/c/cbdbfc756f2990942138ed0138da9303b4dbf9ff
- https://git.kernel.org/stable/c/85568535893600024d7d8794f4f8b6428b521e0c
- https://git.kernel.org/stable/c/632108ec072ad64c8c83db6e16a7efee29ebfb74
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Sources
- CVE-2025-40275 · CVE Program
- CVE-2025-40275 · NVD
- FIRST EPSS
- GHSA-x49w-vx84-7x88 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-40275 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences