{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74497","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.907Z","datePublished":"2026-08-15T12:27:24.494Z","dateUpdated":"2026-08-19T16:37:55.435Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-19T16:37:55.435Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Clamp frame size in implicit-feedback mode\n\nsnd_usb_handle_sync_urb() scales received sync packet sizes by the sender's\nstride and stores the result directly in out_packet->packet_size[i]. If a\nconnected USB device sends an oversized sync packet, this frame count can\nexceed ep->maxframesize.\n\nThe un-clamped frame count then propagates to the playback endpoint queue,\npotentially driving packet transfers beyond the endpoint's hardware frame\nlimits.\n\nCap the calculated frame count against ep->maxframesize in\nsnd_usb_handle_sync_urb() to prevent oversized packets from entering the\nplayback queue."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached via local ALSA USB-audio PCM syscalls (open/hw_params/prepare/trigger) that start isochronous streaming; once implicit-feedback playback is active, malicious inbound USB sync URB completions invoke snd_usb_handle_sync_urb() without any network path.\nAC:L - A malicious USB audio gadget can deterministically send oversized implicit-feedback sync isochronous packets during active playback; the attacker controls both the device firmware and timing, with no race or uncontrollable memory-layout dependency required.\nPR:N - Exploitation is driven by a connected malicious USB audio device sending crafted isochronous IN packets; the attacker needs no host account, kernel capability, or user-namespace privilege on the victim system once playback is running.\nUI:N - After implicit-feedback USB audio playback is started, the malicious device can continuously inject oversized sync packets without further victim interaction; no additional discretionary user actions are needed beyond normal streaming operation.\nS:U - Impact is confined to host-kernel USB-audio transfer-buffer corruption and crashes within the same kernel security authority; it does not constitute a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - Uncapped frame counts stored in the playback queue propagate into URB preparation, causing out-of-bounds access against kernel-coherent USB DMA transfer buffers and adjacent heap memory, enabling information disclosure from corrupted kernel memory.\nI:H - Oversized packet_size values drive memset/copy and iso_frame_desc lengths beyond allocated URB buffer bounds in prepare_silent_urb() and prepare_playback_urb(), yielding controllable out-of-bounds kernel memory writes and heap corruption.\nA:H - The resulting kernel memory corruption and invalid oversized URB transfers trigger kernel oops/panic and repeatable audio-pipeline failure; related mitigations for this implicit-feedback packet-size mismatch explicitly document crash behavior from the same root cause."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/endpoint.c"],"versions":[{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","lessThan":"2d39fea6d3c19a2f5811d123114d92e3d0115fd1","status":"affected","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","lessThan":"09cf3dbbb4256a43feb91d2f51f274510a9ada47","status":"affected","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","lessThan":"cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be","status":"affected","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","lessThan":"56ac3e7c90f6b45969c3fd07a98fad760ffd6901","status":"affected","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","lessThan":"be97fea7451d758881b95af78e900dd0d58a382a","status":"affected","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","lessThan":"2db4535d6af79276a64449201c5be5feffb31c64","status":"affected","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","lessThan":"53f0aa37eb945f3c983f61d12fc35eb33debb8a9","status":"affected","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","lessThan":"8d7a30c50c2e58a6839634ed0acde14466d1dc61","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/endpoint.c"],"versions":[{"version":"3.8","status":"affected"},{"version":"0","lessThan":"3.8","status":"unaffected","versionType":"semver"},{"version":"5.10.265","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.151","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.103","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.44","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.8","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/2d39fea6d3c19a2f5811d123114d92e3d0115fd1"},{"url":"https://git.kernel.org/stable/c/09cf3dbbb4256a43feb91d2f51f274510a9ada47"},{"url":"https://git.kernel.org/stable/c/cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be"},{"url":"https://git.kernel.org/stable/c/56ac3e7c90f6b45969c3fd07a98fad760ffd6901"},{"url":"https://git.kernel.org/stable/c/be97fea7451d758881b95af78e900dd0d58a382a"},{"url":"https://git.kernel.org/stable/c/2db4535d6af79276a64449201c5be5feffb31c64"},{"url":"https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9"},{"url":"https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61"}],"title":"ALSA: usb-audio: Clamp frame size in implicit-feedback mode","x_generator":{"engine":"bippy-1.2.0"}}}}