CVE-2024-44954

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This could be a cause\nof KMSAN warning triggered by syzkaller below (so put as reported-by\nhere).\n\nThis patch protects the midibuf call of the former code path with a\nspinlock for avoiding the possible races."}], "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 unsynchronized accesses are in `line6_data_received()` (URB completion for the control/MIDI-in endpoint) racing the rawmidi API path, and the driver is only bound when a Line 6 device is already attached \u2014 so a local unprivileged user on such a host drives both halves via `/dev/snd/midiC*D*` (and the hwdep node), writing MIDI/sysex to solicit device replies that generate URB completions while concurrently hammering rawmidi read/trigger. No physical access by the attacker is needed in that deployment (audio workstation, live-performance rig).\nAC:L - The attacker controls both sides of the race \u2014 one thread issues rawmidi/hwdep writes that make the device respond on the interrupt-in endpoint, another thread concurrently exercises the rawmidi API \u2014 and the window can be retried indefinitely at MIDI packet rate. Per the guidance, a race whose both sides the attacker creates is Low.\nPR:L - Only ordinary access to the ALSA rawmidi/hwdep character devices is required, which the console/desktop user gets by default through udev ACLs or `audio` group membership. No CAP_SYS_ADMIN or root is needed.\nUI:N - The attacker performs every step itself \u2014 opening the rawmidi node, soliciting device traffic, and racing the accesses. Presence of the Line 6 device is a property of the affected system (the driver does not load otherwise), not a victim action during the attack.\nS:U - The corrupted ring-buffer state, the heap over-read, and the disclosed data all live in the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - syzbot confirmed \"KMSAN: uninit-value in line6_midibuf_read\" at `midibuf.c:185` \u2014 racy `pos_read`/`pos_write`/`full` make the reader consume bytes never written, so stale contents of the `kmalloc()`ed 1024-byte `midi_buffer.buf` slab object are memcpy'd into `line6->buffer_message` and delivered to userspace through `snd_rawmidi_receive()`. A stale `length1 = size - pos_write`/`pos_read` pair also lets the copy index past the end of that allocation, and the leak is repeatable, allowing kernel heap contents (pointers, recycled data) to be harvested.\nI:H - `line6_midibuf_write()` computes `length1 = this->size - this->pos_write` and then does `memcpy(this->buf + this->pos_write, data, length1)` re-reading `pos_write`; with no lock, a concurrent index update makes that copy run past the end of the kmalloc-1024 object with device-supplied MIDI bytes, giving an attacker-influenced heap out-of-bounds write, and corrupted indices also feed bogus data into the rawmidi stream.\nA:H - Out-of-bounds reads and writes on the kmalloc-1024 slab object corrupt adjacent allocations and trip sanitizer/hardening checks, producing oops or panic. The bug is a memory-safety error, which per the guidance is High availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/usb/line6/driver.c"], "versions": [{"version": "705ececd1c60d0f5d6ef2a719008847883516970", "lessThan": "643293b68fbb6c03f5e907736498da17d43f0d81", "status": "affected", "versionType": "git"}, {"version": "705ececd1c60d0f5d6ef2a719008847883516970", "lessThan": "40f3d5cb0e0cbf7fa697913a27d5d361373bdcf5", "status": "affected", "versionType": "git"}, {"version": "705ececd1c60d0f5d6ef2a719008847883516970", "lessThan": "e7e7d2b180d8f297cea6db43ea72402fd33e1a29", "status": "affected", "versionType": "git"}, {"version": "705ececd1c60d0f5d6ef2a719008847883516970", "lessThan": "a54da4b787dcac60b598da69c9c0072812b8282d", "status": "affected", "versionType": "git"}, {"version": "705ececd1c60d0f5d6ef2a719008847883516970", 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This could be a cause\nof KMSAN warning triggered by syzkaller below (so put as reported-by\nhere).\n\nThis patch protects the midibuf call of the former code path with a\nspinlock for avoiding the possible races."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: line6: Fix racy access to midibuf Puede haber accesos concurrentes a midibuf de line6 tanto desde la devoluci\u00f3n de llamada de finalizaci\u00f3n de URB como desde el acceso a la API rawmidi. Esto podr\u00eda ser la causa de la advertencia KMSAN activada por syzkaller a continuaci\u00f3n (as\u00ed que se indica aqu\u00ed). Este parche protege la llamada midibuf de la ruta de c\u00f3digo anterior con un spinlock para evitar las posibles ejecuciones."}], "id": "CVE-2024-44954", "lastModified": "2026-08-04T11:20:03.913", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-44954", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T17:40:10.329711Z", "version": "2.0.3"}}]}, "published": "2024-09-04T19:15:30.353", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/15b7a03205b31bc5623378c190d22b7ff60026f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/40f3d5cb0e0cbf7fa697913a27d5d361373bdcf5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/51d87f11dd199bbc6a85982b088ff27bde53b48a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/535df7f896a568a8a1564114eaea49d002cb1747"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/643293b68fbb6c03f5e907736498da17d43f0d81"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a54da4b787dcac60b598da69c9c0072812b8282d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c80f454a805443c274394b1db0d1ebf477abd94e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e7e7d2b180d8f297cea6db43ea72402fd33e1a29"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ALSA: line6: Fix racy access to midibuf", "id": "2309785", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2309785"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-362", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nALSA: line6: Fix racy access to midibuf\nThere can be concurrent accesses to line6 midibuf from both the URB\ncompletion callback and the rawmidi API access. This could be a cause\nof KMSAN warning triggered by syzkaller below (so put as reported-by\nhere).\nThis patch protects the midibuf call of the former code path with a\nspinlock for avoiding the possible races."], "name": "CVE-2024-44954", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-09-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-44954\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-44954\nhttps://lore.kernel.org/linux-cve-announce/2024090411-CVE-2024-44954-6838@gregkh/T"], "threat_severity": "Moderate"}

{}