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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-40269
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-06 22:15:54 UTC
Updated2026-07-30 06:24:24 UTC
DescriptionIn 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].

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001570000 probability, percentile 0.053610000 (date 2026-07-31)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 02c56650f3c118d3752122996d96173d26bb13aa 480a1490c595a242f27493a4544b3efb21b29f6a git Not specified
CNA Linux Linux affected 5ef30e443e6d3654cccecec99cf481a69a0a6d3b ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41 git Not specified
CNA Linux Linux affected 99703c921864a318e3e8aae74fde071b1ff35bea 282aba56713bbc58155716b55ca7222b2d9cf3c8 git Not specified
CNA Linux Linux affected 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf c4dc012b027c9eb101583011089dea14d744e314 git Not specified
CNA Linux Linux affected aba41867dd66939d336fdf604e4d73b805d8039f e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360 git Not specified
CNA Linux Linux affected d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 d67dde02049e632ba58d3c44a164a74b6a737154 git Not specified
CNA Linux Linux affected f0bd62b64016508938df9babe47f65c2c727d25c 6a5da3fa80affc948923f20a4e086177f505e86e git Not specified
CNA Linux Linux affected f0bd62b64016508938df9babe47f65c2c727d25c 217d47255a2ec8b246f2725f5db9ac3f1d4109d7 git Not specified
CNA Linux Linux affected f0bd62b64016508938df9babe47f65c2c727d25c ef592bf2232a2daa9fffa8881881fc9957ea56e9 git Not specified
CNA Linux Linux affected f0bd62b64016508938df9babe47f65c2c727d25c ece3b981bb6620e47fac826a2156c090b1a936a0 git Not specified
CNA Linux Linux affected f0bd62b64016508938df9babe47f65c2c727d25c 98e9d5e33bda8db875cc1a4fe99c192658e45ab6 git Not specified
CNA Linux Linux affected f0bd62b64016508938df9babe47f65c2c727d25c d2c04f20ccc6c0d219e6d3038bab45bc66a178ad git Not specified
CNA Linux Linux affected f0bd62b64016508938df9babe47f65c2c727d25c 05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf git Not specified
CNA Linux Linux affected 4.4.229 4.4.230 semver Not specified
CNA Linux Linux affected 4.9.229 4.9.230 semver Not specified
CNA Linux Linux affected 4.14.186 4.14.188 semver Not specified
CNA Linux Linux affected 4.19.130 4.19.132 semver Not specified
CNA Linux Linux affected 5.4.49 5.4.51 semver Not specified
CNA Linux Linux affected 5.7.6 5.7.8 semver Not specified
CNA Linux Linux affected 5.8 Not specified
CNA Linux Linux unaffected 5.8 semver Not specified
CNA Linux Linux unaffected 4.4.230 4.4.* semver Not specified
CNA Linux Linux unaffected 4.9.230 4.9.* semver Not specified
CNA Linux Linux unaffected 4.14.188 4.14.* semver Not specified
CNA Linux Linux unaffected 4.19.132 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.51 5.4.* semver Not specified
CNA Linux Linux unaffected 5.7.8 5.7.* semver Not specified
CNA Linux Linux unaffected 5.10.247 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.197 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.159 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.117 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.59 6.12.* semver Not specified
CNA Linux Linux unaffected 6.17.9 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ef592bf2232a2daa9fffa8881881fc9957ea56e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ece3b981bb6620e47fac826a2156c090b1a936a0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/480a1490c595a242f27493a4544b3efb21b29f6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/282aba56713bbc58155716b55ca7222b2d9cf3c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/217d47255a2ec8b246f2725f5db9ac3f1d4109d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/98e9d5e33bda8db875cc1a4fe99c192658e45ab6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d67dde02049e632ba58d3c44a164a74b6a737154 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d2c04f20ccc6c0d219e6d3038bab45bc66a178ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c4dc012b027c9eb101583011089dea14d744e314 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6a5da3fa80affc948923f20a4e086177f505e86e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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