{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93280", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T16:02:15.098Z", "datePublished": "2026-09-24T15:52:22.253Z", "dateUpdated": "2026-10-19T09:08:34.610Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:08:34.610Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngreybus: audio: bound the topology section sizes against the fetched size\n\ngb_audio_gb_get_topology() fetches a topology blob of a module-supplied\nsize, and gbaudio_tplg_parse_data() then walks it by adding the\nmodule-supplied size_dais, size_controls and size_widgets fields to\nform the control, widget and route section offsets. Those le32 sizes\nare never checked against the fetched blob, so a module reporting a\nsmall topology size but large section sizes makes the offsets point\npast the allocation, and parsing reads out of bounds.\n\nReject a topology whose section sizes do not fit within the fetched\nsize before it is parsed." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The malformed bytes are size_dais/size_controls/size_widgets in the GB_AUDIO_TYPE_GET_TOPOLOGY response that gb_audio_probe() fetches via gb_audio_gb_get_topology()→gb_operation_sync(); on BeaglePlay that Greybus payload is delivered by hdlc_rx_greybus_frame() from the CC1352 802.15.4 SVC, so a radio-range module supplies the blob, not a routable IP peer.\nAC:L - A module that returns a small GET_TOPOLOGY_SIZE and then oversized le32 size_* fields makes gbaudio_tplg_process_header() compute control_offset/widget_offset past the kzalloc() blob on every gb_audio_probe(); the attacker fully controls those fields and no race or uninfluenced host state is required.\nPR:N - gb_svc_process_module_inserted()→gb_module_add()→gb_interface_enable()→greybus_probe()→gb_audio_probe() runs with no capable() or host-uid check, and CAP authentication is a separate optional ioctl, not a gate on this path; the attacking module needs no Linux account.\nUI:N - gb_audio_probe() itself calls gb_audio_gb_get_topology() and gbaudio_tplg_parse_data() as soon as a GREYBUS_CLASS_AUDIO bundle is registered; no victim ioctl, ALSA open, or mount is required.\nS:U - The over-read and snprintf() stores corrupt the host kernel topology allocation and adjacent slab inside the same kernel authority; this is not a KVM/Xen guest-to-host escape or an IOMMU/DMA bypass.\nC:H - gbaudio_tplg_process_kcontrols() and gbaudio_tplg_create_widget() read gb_audio_control/widget fields from the OOB offset, and gb_generate_enum_strings() walks names with an unbounded while (*data != '\\0') past the blob, disclosing adjacent kernel heap (and those strings can later appear as ALSA enum names).\nI:H - With curr/w pointing past the topology object, snprintf(curr->name, sizeof(curr->name), \"GB %d %s\", ...) in gbaudio_tplg_process_kcontrols() and snprintf(w->name, ...) in gbaudio_tplg_create_widget() perform 32-byte out-of-bounds writes at an attacker-chosen size_dais+size_controls offset, a heap write primitive.\nA:H - Walking those OOB control/widget pointers and the unbounded enum-name scan can fault on an unmapped page during gb_audio_probe() and oops the kernel; the module can re-insert to repeat it." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/staging/greybus/audio_gb.c" ], "versions": [ { "version": "184992e305f1de3a3d5fa446da3a2bc76be7c54a", "lessThan": "ba86de9f7b0d7903d2df5ea2373e34d8ca3fc43e", "status": "affected", "versionType": "git" }, { "version": "184992e305f1de3a3d5fa446da3a2bc76be7c54a", "lessThan": "dd5593aee0a0fb353e1164aff7b65e563fe1f232", "status": "affected", "versionType": "git" }, { "version": "184992e305f1de3a3d5fa446da3a2bc76be7c54a", "lessThan": "6f764363b3173d805be11e59a8f23ecee2d420d5", "status": "affected", "versionType": "git" }, { "version": "184992e305f1de3a3d5fa446da3a2bc76be7c54a", "lessThan": "52daf9de692ebac813d110eb1e677dc0e1f4a5ab", "status": "affected", "versionType": "git" }, { "version": "184992e305f1de3a3d5fa446da3a2bc76be7c54a", "lessThan": "d0f6eaba60705bacd9bb4ce48eab50ef3f546777", "status": "affected", "versionType": "git" }, { "version": "184992e305f1de3a3d5fa446da3a2bc76be7c54a", "lessThan": "c9191f2e2f35f1209eb2dc24b31129dd47b48c16", "status": "affected", "versionType": "git" }, { "version": "184992e305f1de3a3d5fa446da3a2bc76be7c54a", "lessThan": "cfcc5a41a9664eb68023aae4cd0d485b256bd7c7", "status": "affected", "versionType": "git" }, { "version": "184992e305f1de3a3d5fa446da3a2bc76be7c54a", "lessThan": "33d8c7b794d2a30637c9d3fcb478f1d3222bef1e", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/staging/greybus/audio_gb.c" ], "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "lessThan": "4.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "4.9", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ba86de9f7b0d7903d2df5ea2373e34d8ca3fc43e" }, { "url": "https://git.kernel.org/stable/c/dd5593aee0a0fb353e1164aff7b65e563fe1f232" }, { "url": "https://git.kernel.org/stable/c/6f764363b3173d805be11e59a8f23ecee2d420d5" }, { "url": "https://git.kernel.org/stable/c/52daf9de692ebac813d110eb1e677dc0e1f4a5ab" }, { "url": "https://git.kernel.org/stable/c/d0f6eaba60705bacd9bb4ce48eab50ef3f546777" }, { "url": "https://git.kernel.org/stable/c/c9191f2e2f35f1209eb2dc24b31129dd47b48c16" }, { "url": "https://git.kernel.org/stable/c/cfcc5a41a9664eb68023aae4cd0d485b256bd7c7" }, { "url": "https://git.kernel.org/stable/c/33d8c7b794d2a30637c9d3fcb478f1d3222bef1e" } ], "title": "greybus: audio: bound the topology section sizes against the fetched size", "x_generator": { "engine": "bippy-1.2.0" } } } }