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

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未正确限制PCM传输缓冲区大小，可能导致缓冲区溢出。

CVSS 7.8 · High EPSS 0.18% · P7

Affected Version Matrix 34

VendorProduct Version RangeStatus
Linux Linux 02c56650f3c118d3752122996d96173d26bb13aa< 480a1490c595a242f27493a4544b3efb21b29f6a affected
5ef30e443e6d3654cccecec99cf481a69a0a6d3b< ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41 affected
99703c921864a318e3e8aae74fde071b1ff35bea< 282aba56713bbc58155716b55ca7222b2d9cf3c8 affected
2d50acd7dbd0682a56968ad9551341d7fc5b6eaf< c4dc012b027c9eb101583011089dea14d744e314 affected
aba41867dd66939d336fdf604e4d73b805d8039f< e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360 affected
d288dc74f8cf95cb7ae0aaf245b7128627a49bf3< d67dde02049e632ba58d3c44a164a74b6a737154 affected
f0bd62b64016508938df9babe47f65c2c727d25c< 6a5da3fa80affc948923f20a4e086177f505e86e affected
f0bd62b64016508938df9babe47f65c2c727d25c< 217d47255a2ec8b246f2725f5db9ac3f1d4109d7 affected
… +26 more rows
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 02c56650f3c118d3752122996d96173d26bb13aa ~ 480a1490c595a242f27493a4544b3efb21b29f6a -
Linux Linux 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-2025-40282 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-2025-40270 7.8 HIGH mm, swap: fix potential UAF issue for VMA readahead
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-2025-40271 7.8 HIGH fs/proc: fix uaf in proc_readdir_de()
CVE-2025-40280 7.8 HIGH tipc: Fix use-after-free in tipc_mon_reinit_self().
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-2025-40275 ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd
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-2025-40269

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