CVE-2025-40269

ALSA: usb-audio: Fix potential overflow of PCM transfer buffer

State: Published
Severity: 7.8 High
Published: Dec 6, 2025
Updated: Aug 5, 2026
Reserved: Apr 16, 2025

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].

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	02c56650f3c118d3752122996d96173d26bb13aa to before 480a1490c595a242f27493a4544b3efb21b29f6aAffected 5ef30e443e6d3654cccecec99cf481a69a0a6d3b to before ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41Affected 99703c921864a318e3e8aae74fde071b1ff35bea to before 282aba56713bbc58155716b55ca7222b2d9cf3c8Affected 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf to before c4dc012b027c9eb101583011089dea14d744e314Affected aba41867dd66939d336fdf604e4d73b805d8039f to before e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360Affected d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 to before d67dde02049e632ba58d3c44a164a74b6a737154Affected f0bd62b64016508938df9babe47f65c2c727d25c to before 6a5da3fa80affc948923f20a4e086177f505e86eAffected f0bd62b64016508938df9babe47f65c2c727d25c to before 217d47255a2ec8b246f2725f5db9ac3f1d4109d7Affected f0bd62b64016508938df9babe47f65c2c727d25c to before ef592bf2232a2daa9fffa8881881fc9957ea56e9Affected f0bd62b64016508938df9babe47f65c2c727d25c to before ece3b981bb6620e47fac826a2156c090b1a936a0Affected f0bd62b64016508938df9babe47f65c2c727d25c to before 98e9d5e33bda8db875cc1a4fe99c192658e45ab6Affected f0bd62b64016508938df9babe47f65c2c727d25c to before d2c04f20ccc6c0d219e6d3038bab45bc66a178adAffected f0bd62b64016508938df9babe47f65c2c727d25c to before 05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddfAffected 4.4.229 to before 4.4.230Affected 4.9.229 to before 4.9.230Affected 4.14.186 to before 4.14.188Affected 4.19.130 to before 4.19.132Affected 5.4.49 to before 5.4.51Affected 5.7.6 to before 5.7.8Affected
LinuxLinux	5.8Affected before 5.8Not affected 4.4.230 through 4.4.Not affected 4.9.230 through 4.9.Not affected 4.14.188 through 4.14.Not affected 4.19.132 through 4.19.Not affected 5.4.51 through 5.4.Not affected 5.7.8 through 5.7.Not affected 5.10.247 through 5.10.Not affected 5.15.197 through 5.15.Not affected 6.1.159 through 6.1.Not affected 6.6.117 through 6.6.Not affected 6.12.59 through 6.12.Not affected 6.17.9 through 6.17.Not affected 6.18 and laterNot affected

Product

Versions

LinuxLinux

02c56650f3c118d3752122996d96173d26bb13aa to before 480a1490c595a242f27493a4544b3efb21b29f6aAffected
5ef30e443e6d3654cccecec99cf481a69a0a6d3b to before ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41Affected
99703c921864a318e3e8aae74fde071b1ff35bea to before 282aba56713bbc58155716b55ca7222b2d9cf3c8Affected
2d50acd7dbd0682a56968ad9551341d7fc5b6eaf to before c4dc012b027c9eb101583011089dea14d744e314Affected
aba41867dd66939d336fdf604e4d73b805d8039f to before e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360Affected
d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 to before d67dde02049e632ba58d3c44a164a74b6a737154Affected
f0bd62b64016508938df9babe47f65c2c727d25c to before 6a5da3fa80affc948923f20a4e086177f505e86eAffected
f0bd62b64016508938df9babe47f65c2c727d25c to before 217d47255a2ec8b246f2725f5db9ac3f1d4109d7Affected
f0bd62b64016508938df9babe47f65c2c727d25c to before ef592bf2232a2daa9fffa8881881fc9957ea56e9Affected
f0bd62b64016508938df9babe47f65c2c727d25c to before ece3b981bb6620e47fac826a2156c090b1a936a0Affected
f0bd62b64016508938df9babe47f65c2c727d25c to before 98e9d5e33bda8db875cc1a4fe99c192658e45ab6Affected
f0bd62b64016508938df9babe47f65c2c727d25c to before d2c04f20ccc6c0d219e6d3038bab45bc66a178adAffected
f0bd62b64016508938df9babe47f65c2c727d25c to before 05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddfAffected
4.4.229 to before 4.4.230Affected
4.9.229 to before 4.9.230Affected
4.14.186 to before 4.14.188Affected
4.19.130 to before 4.19.132Affected
5.4.49 to before 5.4.51Affected
5.7.6 to before 5.7.8Affected

LinuxLinux

5.8Affected
before 5.8Not affected
4.4.230 through 4.4.*Not affected
4.9.230 through 4.9.*Not affected
4.14.188 through 4.14.*Not affected
4.19.132 through 4.19.*Not affected
5.4.51 through 5.4.*Not affected
5.7.8 through 5.7.*Not affected
5.10.247 through 5.10.*Not affected
5.15.197 through 5.15.*Not affected
6.1.159 through 6.1.*Not affected
6.6.117 through 6.6.*Not affected
6.12.59 through 6.12.*Not affected
6.17.9 through 6.17.*Not affected
6.18 and laterNot affected

References

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