{"api_version":"1","generated_at":"2026-08-26T02:47:45+00:00","cve":"CVE-2026-74497","urls":{"html":"https://cve.report/CVE-2026-74497","api":"https://cve.report/api/cve/CVE-2026-74497.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74497","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74497"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:17:54","updated_at":"2026-08-19 17:21:06"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be","name":"https://git.kernel.org/stable/c/cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/be97fea7451d758881b95af78e900dd0d58a382a","name":"https://git.kernel.org/stable/c/be97fea7451d758881b95af78e900dd0d58a382a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/09cf3dbbb4256a43feb91d2f51f274510a9ada47","name":"https://git.kernel.org/stable/c/09cf3dbbb4256a43feb91d2f51f274510a9ada47","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9","name":"https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/56ac3e7c90f6b45969c3fd07a98fad760ffd6901","name":"https://git.kernel.org/stable/c/56ac3e7c90f6b45969c3fd07a98fad760ffd6901","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2d39fea6d3c19a2f5811d123114d92e3d0115fd1","name":"https://git.kernel.org/stable/c/2d39fea6d3c19a2f5811d123114d92e3d0115fd1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61","name":"https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2db4535d6af79276a64449201c5be5feffb31c64","name":"https://git.kernel.org/stable/c/2db4535d6af79276a64449201c5be5feffb31c64","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74497","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74497","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 28acb12014fb0c3e1edfdab1b1e3e266cf651550 2d39fea6d3c19a2f5811d123114d92e3d0115fd1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 28acb12014fb0c3e1edfdab1b1e3e266cf651550 09cf3dbbb4256a43feb91d2f51f274510a9ada47 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 28acb12014fb0c3e1edfdab1b1e3e266cf651550 cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 28acb12014fb0c3e1edfdab1b1e3e266cf651550 56ac3e7c90f6b45969c3fd07a98fad760ffd6901 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.216 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.151 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.103 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74497","cve":"CVE-2026-74497","epss":"0.001420000","percentile":"0.039840000","score_date":"2026-08-19","updated_at":"2026-08-20 00:13:08"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["sound/usb/endpoint.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2d39fea6d3c19a2f5811d123114d92e3d0115fd1","status":"affected","version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","versionType":"git"},{"lessThan":"09cf3dbbb4256a43feb91d2f51f274510a9ada47","status":"affected","version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","versionType":"git"},{"lessThan":"cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be","status":"affected","version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","versionType":"git"},{"lessThan":"56ac3e7c90f6b45969c3fd07a98fad760ffd6901","status":"affected","version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","versionType":"git"},{"lessThan":"be97fea7451d758881b95af78e900dd0d58a382a","status":"affected","version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","versionType":"git"},{"lessThan":"2db4535d6af79276a64449201c5be5feffb31c64","status":"affected","version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","versionType":"git"},{"lessThan":"53f0aa37eb945f3c983f61d12fc35eb33debb8a9","status":"affected","version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","versionType":"git"},{"lessThan":"8d7a30c50c2e58a6839634ed0acde14466d1dc61","status":"affected","version":"28acb12014fb0c3e1edfdab1b1e3e266cf651550","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["sound/usb/endpoint.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.8"},{"lessThan":"3.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.265","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.216","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.183","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.151","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.103","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.44","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.265","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.216","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.183","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.151","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"3.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"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":{"dateUpdated":"2026-08-19T16:37:55.435Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74497","datePublished":"2026-08-15T12:27:24.494Z","dateReserved":"2026-08-15T05:44:03.907Z","dateUpdated":"2026-08-19T16:37:55.435Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:17:54","lastModifiedDate":"2026-08-19 17:21:06","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74497","Ordinal":"1","Title":"ALSA: usb-audio: Clamp frame size in implicit-feedback mode","CVE":"CVE-2026-74497","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74497","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ALSA: usb-audio: Clamp frame size in implicit-feedback mode"}]}}}