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CVE-2025-40275— ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ALSA usb-audio未检查usb_ifnum_to_if返回值，可能导致空指针取消引用。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 17156f23e93c0f59e06dd2aaffd06221341caaee< 23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4 affected
17156f23e93c0f59e06dd2aaffd06221341caaee< c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6 affected
17156f23e93c0f59e06dd2aaffd06221341caaee< 9f282104627be5fbded3102ff9004f753c55a063 affected
17156f23e93c0f59e06dd2aaffd06221341caaee< 2762d3ea9c929ca4094541ca517c317ffa94625b affected
17156f23e93c0f59e06dd2aaffd06221341caaee< 57f607c112966c21240c424b33e2cb71e121dcf0 affected
17156f23e93c0f59e06dd2aaffd06221341caaee< cbdbfc756f2990942138ed0138da9303b4dbf9ff affected
17156f23e93c0f59e06dd2aaffd06221341caaee< 85568535893600024d7d8794f4f8b6428b521e0c affected
17156f23e93c0f59e06dd2aaffd06221341caaee< 632108ec072ad64c8c83db6e16a7efee29ebfb74 affected
… +10 more rows
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I. Basic Information for CVE-2025-40275

Vulnerability Information
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Vulnerability Title
ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ALSA usb-audio未检查usb_ifnum_to_if返回值，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 17156f23e93c0f59e06dd2aaffd06221341caaee ~ 23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4 -
Linux Linux 4.18 -

II. Public POCs for CVE-2025-40275

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III. Intelligence Information for CVE-2025-40275

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Same Patch Batch · Linux · 2025-12-06 · 23 CVEs total

CVE-2025-40282 8.8 HIGH Bluetooth: 6lowpan: reset link-local header on ipv6 recv path
CVE-2025-40273 8.8 HIGH NFSD: free copynotify stateid in nfs4_free_ol_stateid()
CVE-2025-40269 7.8 HIGH ALSA: usb-audio: Fix potential overflow of PCM transfer buffer
CVE-2025-40284 7.8 HIGH Bluetooth: MGMT: cancel mesh send timer when hdev removed
CVE-2025-40283 7.8 HIGH Bluetooth: btusb: reorder cleanup in btusb_disconnect to avoid UAF
CVE-2025-40270 7.8 HIGH mm, swap: fix potential UAF issue for VMA readahead
CVE-2025-40280 7.8 HIGH tipc: Fix use-after-free in tipc_mon_reinit_self().
CVE-2025-40271 7.8 HIGH fs/proc: fix uaf in proc_readdir_de()
CVE-2025-40272 7.8 HIGH mm/secretmem: fix use-after-free race in fault handler
CVE-2025-40277 7.8 HIGH drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE
CVE-2025-40274 7.8 HIGH KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying
CVE-2025-40285 7.5 HIGH smb/server: fix possible refcount leak in smb2_sess_setup()
CVE-2025-40276 7.3 HIGH drm/panthor: Flush shmem writes before mapping buffers CPU-uncached
CVE-2025-40278 net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak
CVE-2025-40267 io_uring/rw: ensure allocated iovec gets cleared for early failure
CVE-2025-40268 cifs: client: fix memory leak in smb3_fs_context_parse_param
CVE-2025-40289 drm/amdgpu: hide VRAM sysfs attributes on GPUs without VRAM
CVE-2025-40279 net: sched: act_connmark: initialize struct tc_ife to fix kernel leak
CVE-2025-40281 sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto
CVE-2025-40286 smb/server: fix possible memory leak in smb2_read()

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40275

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