{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72446","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.930Z","datePublished":"2026-08-15T05:56:56.470Z","dateUpdated":"2026-08-17T05:44:17.542Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:44:17.542Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: qcom: reject stream disable with no active interface\n\nhandle_uaudio_stream_req() resolves an interface index with\ninfo_idx_from_ifnum(), which returns -EINVAL when no interface matches.\nThe enable branch and the response: cleanup label both guard against a\nnegative index, but the disable branch does not: it forms\ninfo = &uadev[pcm_card_num].info[info_idx] and dereferences it.\n\nuadev[].info is a pointer allocated only when a stream is first enabled,\nso a negative info_idx on the disable path is unsafe in two ways:\n\n - If the card was never enabled, .info is NULL and &info[-EINVAL] is a\n   wild pointer; reading info->data_ep_pipe faults (kernel oops).\n\n - If the card was enabled at least once (.info allocated) and the\n   disable names an interface that does not match, &info[-EINVAL] points\n   before the allocation; info->data_ep_pipe / info->sync_ep_pipe are an\n   out-of-bounds slab read and, when non-zero, an out-of-bounds 4-byte\n   write (both pipe fields are cleared to 0). That is memory corruption,\n   not just a NULL dereference.\n\nThe request is reachable from unprivileged local userspace over\nAF_QIPCRTR. Reject a disable request with no resolved interface, matching\nthe guard the enable path already has."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires sending a crafted QMI stream-disable request via the AF_QIPCRTR local socket API into the kernel-registered UAUDIO QMI server; it is not reachable over the network or by plugging in USB alone.\nAC:L - An attacker can deterministically trigger the bug by sending enable=0 with a valid usb_token for a probed USB-audio card when no matching interface exists; no race or attacker-uncontrollable memory layout is required.\nPR:L - AF_QIPCRTR permits unprivileged local userspace to deliver QMI requests to the registered service without root or CAP_NET_ADMIN, and the fix commit explicitly states the path is reachable from unprivileged userspace.\nUI:N - Exploitation is a direct programmatic QMI disable request and does not require the victim to mount filesystems, open files, or perform any interactive action at trigger time.\nS:U - The flaw corrupts kernel heap memory within the same kernel security authority; it does not by itself cross a VM, IOMMU, or sandbox boundary to another security domain.\nC:H - When a card was previously enabled, a failed interface lookup yields a negative index that performs an out-of-bounds slab read of endpoint pipe fields before the allocated intf_info array, enabling kernel memory disclosure.\nI:H - The same out-of-bounds path can perform up to two conditional 4-byte writes clearing data_ep_pipe and sync_ep_pipe in adjacent slab memory, constituting exploitable kernel heap corruption rather than a benign crash.\nA:H - If the card was never enabled, info is NULL and indexing with -EINVAL dereferences a wild pointer reading data_ep_pipe, causing a kernel oops/panic and complete local denial of service."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/qcom/qc_audio_offload.c"],"versions":[{"version":"326bbc348298ab0946c5560defe024a5f6ef28bb","lessThan":"25a867aa5e67a84333fa6e5c21292c5bcff86b90","status":"affected","versionType":"git"},{"version":"326bbc348298ab0946c5560defe024a5f6ef28bb","lessThan":"a22356d1f731553e99aa2707dbd38c659bdd28d8","status":"affected","versionType":"git"},{"version":"326bbc348298ab0946c5560defe024a5f6ef28bb","lessThan":"bdb640be82e645e2828731648f485224d0c2587b","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/qcom/qc_audio_offload.c"],"versions":[{"version":"6.16","status":"affected"},{"version":"0","lessThan":"6.16","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","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":"6.16","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/25a867aa5e67a84333fa6e5c21292c5bcff86b90"},{"url":"https://git.kernel.org/stable/c/a22356d1f731553e99aa2707dbd38c659bdd28d8"},{"url":"https://git.kernel.org/stable/c/bdb640be82e645e2828731648f485224d0c2587b"}],"title":"ALSA: usb-audio: qcom: reject stream disable with no active interface","x_generator":{"engine":"bippy-1.2.0"}}}}