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CVE-2025-40269— ALSA: usb-audio: Fix potential overflow of PCM transfer buffer

EPSS 0.13% · P33
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I. Basic Information for CVE-2025-40269

Vulnerability Information
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Vulnerability Title
ALSA: usb-audio: Fix potential overflow of PCM transfer buffer
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix potential overflow of PCM transfer buffer The PCM stream data in USB-audio driver is transferred over USB URB packet buffers, and each packet size is determined dynamically. The packet sizes are limited by some factors such as wMaxPacketSize USB descriptor. OTOH, in the current code, the actually used packet sizes are determined only by the rate and the PPS, which may be bigger than the size limit above. This results in a buffer overflow, as reported by syzbot. Basically when the limit is smaller than the calculated packet size, it implies that something is wrong, most likely a weird USB descriptor. So the best option would be just to return an error at the parameter setup time before doing any further operations. This patch introduces such a sanity check, and returns -EINVAL when the packet size is greater than maxpacksize. The comparison with ep->packsize[1] alone should suffice since it's always equal or greater than ep->packsize[0].
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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未正确限制PCM传输缓冲区大小，可能导致缓冲区溢出。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 02c56650f3c118d3752122996d96173d26bb13aa ~ 480a1490c595a242f27493a4544b3efb21b29f6a -
LinuxLinux 5.8 -

II. Public POCs for CVE-2025-40269

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III. Intelligence Information for CVE-2025-40269

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

CVE-2025-40278net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak
CVE-2025-40267io_uring/rw: ensure allocated iovec gets cleared for early failure
CVE-2025-40268cifs: client: fix memory leak in smb3_fs_context_parse_param
CVE-2025-40270mm, swap: fix potential UAF issue for VMA readahead
CVE-2025-40271fs/proc: fix uaf in proc_readdir_de()
CVE-2025-40272mm/secretmem: fix use-after-free race in fault handler
CVE-2025-40273NFSD: free copynotify stateid in nfs4_free_ol_stateid()
CVE-2025-40274KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying
CVE-2025-40275ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd
CVE-2025-40276drm/panthor: Flush shmem writes before mapping buffers CPU-uncached
CVE-2025-40277drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE
CVE-2025-40289drm/amdgpu: hide VRAM sysfs attributes on GPUs without VRAM
CVE-2025-40279net: sched: act_connmark: initialize struct tc_ife to fix kernel leak
CVE-2025-40280tipc: Fix use-after-free in tipc_mon_reinit_self().
CVE-2025-40281sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto
CVE-2025-40282Bluetooth: 6lowpan: reset link-local header on ipv6 recv path
CVE-2025-40283Bluetooth: btusb: reorder cleanup in btusb_disconnect to avoid UAF
CVE-2025-40284Bluetooth: MGMT: cancel mesh send timer when hdev removed
CVE-2025-40285smb/server: fix possible refcount leak in smb2_sess_setup()
CVE-2025-40286smb/server: fix possible memory leak in smb2_read()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40269

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