{"id":"CVE-2026-74497","state":"PUBLISHED","title":"ALSA: usb-audio: Clamp frame size in implicit-feedback mode","description":"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.","publishedAt":"2026-08-15T12:27:24.494Z","updatedAt":"2026-10-16T19:05:50.570Z","severity":{"score":8.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"2d39fea6d3c19a2f5811d123114d92e3d0115fd1","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"09cf3dbbb4256a43feb91d2f51f274510a9ada47","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"56ac3e7c90f6b45969c3fd07a98fad760ffd6901","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"be97fea7451d758881b95af78e900dd0d58a382a","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"2db4535d6af79276a64449201c5be5feffb31c64","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"53f0aa37eb945f3c983f61d12fc35eb33debb8a9","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"8d7a30c50c2e58a6839634ed0acde14466d1dc61","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/endpoint.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.8","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/endpoint.c"]}],"references":["https://git.kernel.org/stable/c/2d39fea6d3c19a2f5811d123114d92e3d0115fd1","https://git.kernel.org/stable/c/09cf3dbbb4256a43feb91d2f51f274510a9ada47","https://git.kernel.org/stable/c/cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be","https://git.kernel.org/stable/c/56ac3e7c90f6b45969c3fd07a98fad760ffd6901","https://git.kernel.org/stable/c/be97fea7451d758881b95af78e900dd0d58a382a","https://git.kernel.org/stable/c/2db4535d6af79276a64449201c5be5feffb31c64","https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9","https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74497.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74497","state":"PUBLISHED","datePublished":"2026-08-15T12:27:24.494Z","dateUpdated":"2026-10-16T19:05:50.570Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.907Z"},"containers":{"cna":{"title":"ALSA: usb-audio: Clamp frame size in implicit-feedback mode","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"2d39fea6d3c19a2f5811d123114d92e3d0115fd1","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"09cf3dbbb4256a43feb91d2f51f274510a9ada47","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"56ac3e7c90f6b45969c3fd07a98fad760ffd6901","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"be97fea7451d758881b95af78e900dd0d58a382a","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"2db4535d6af79276a64449201c5be5feffb31c64","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"53f0aa37eb945f3c983f61d12fc35eb33debb8a9","versionType":"git"},{"version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","status":"affected","lessThan":"8d7a30c50c2e58a6839634ed0acde14466d1dc61","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/endpoint.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.8","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/endpoint.c"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:37:55.435Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-74497","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:58:20.810517Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:05:50.570Z"}}]}}}