{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-38628", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-18T19:36:34.946Z", "datePublished": "2024-06-21T10:18:19.558Z", "dateUpdated": "2026-08-05T11:33:16.721Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:33:16.721Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_audio: Fix race condition use of controls after free during gadget unbind.\n\nHang on to the control IDs instead of pointers since those are correctly\nhandled with locks." } ], "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 - The free side of the race is driven by local gadget teardown (`configfs` UDC unbind / `afunc_unbind` → `g_audio_cleanup`) and by the userspace close of the ALSA control fd that gates the deferred `snd_card_free_when_closed()`, while the use side is reachable locally through `dummy_hcd`/`raw-gadget` acting as an in-software USB host. This matches established kernel.org scoring for USB gadget bind/unbind use-after-frees (e.g. CVE-2025-38555, CVE-2026-63894).\nAC:L - The attacker controls both sides of the race — the moment of the free (unbind plus closing the last `/dev/snd/control*` descriptor, which is what actually triggers `snd_card_do_free()` and releases the kcontrols) and the moment of the use (UAC volume/mute `SET_CUR` transfers, altsetting changes, or bus suspend) — so it can be retried and won reliably.\nPR:L - An unprivileged local user can hold and release the ALSA control descriptor to pin the exact instant the kcontrols are freed and can drive the USB-side control transfers via the loopback host stack, consistent with the PR:L assigned to other gadget teardown use-after-frees reached through the same configfs path.\nUI:N - The attacker performs every step itself — unbind, fd close, and the UAC control traffic — with no action required from any other user.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `snd_kcontrol` is read after free and its `id` field (including the 64-byte name) is copied into a `snd_ctl_event` delivered to userspace readers of the control device, leaking groomable freed slab contents; a controlled use-after-free read of this kind is a general kernel memory disclosure primitive.\nI:H - `set_active()` and `u_audio_set_volume/mute()` acquire `prm->lock` and write `prm->active`/`volume`/`mute` into the already-`kfree()`d `snd_uac_chip`, and `snd_ctl_notify()` performs list insertion on the freed `snd_card`, giving write-after-free and list-corruption primitives that can be leveraged for control-flow hijacking.\nA:H - Use of freed kcontrol, `snd_card`, and `snd_uac_chip` objects — including spinlock operations and list walks on freed memory — reliably produces KASAN splats, list corruption, and kernel panics." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/gadget/function/u_audio.c" ], "versions": [ { "version": "02de698ca8123782c0c6fb8ed99080e2f032b0d2", "lessThan": "89e66809684485590ea0b32c3178e42cba36ac09", "status": "affected", "versionType": "git" }, { "version": "02de698ca8123782c0c6fb8ed99080e2f032b0d2", "lessThan": "453d3fa9266e53f85377b911c19b9a4563fa88c0", "status": "affected", "versionType": "git" }, { "version": "02de698ca8123782c0c6fb8ed99080e2f032b0d2", "lessThan": "bea73b58ab67fe581037ad9cdb93c2557590c068", "status": "affected", "versionType": "git" }, { "version": "02de698ca8123782c0c6fb8ed99080e2f032b0d2", "lessThan": "1b739388aa3f8dfb63a9fca777e6dfa6912d0464", "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/usb/gadget/function/u_audio.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.93", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.33", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.4", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "5.15", "versionEndExcluding": "6.1.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.9.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/89e66809684485590ea0b32c3178e42cba36ac09" }, { "url": "https://git.kernel.org/stable/c/453d3fa9266e53f85377b911c19b9a4563fa88c0" }, { "url": "https://git.kernel.org/stable/c/bea73b58ab67fe581037ad9cdb93c2557590c068" }, { "url": "https://git.kernel.org/stable/c/1b739388aa3f8dfb63a9fca777e6dfa6912d0464" } ], "title": "usb: gadget: u_audio: Fix race condition use of controls after free during gadget unbind.", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-362", "lang": "en", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-24T15:20:09.528911Z", "id": "CVE-2024-38628", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-05T16:32:35.156Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:12:26.065Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/89e66809684485590ea0b32c3178e42cba36ac09", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/453d3fa9266e53f85377b911c19b9a4563fa88c0", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/bea73b58ab67fe581037ad9cdb93c2557590c068", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/1b739388aa3f8dfb63a9fca777e6dfa6912d0464", "tags": [ "x_transferred" ] } ] } ] } }