CVE-2022-48735

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ALSA mixer and LED brightness interfaces used in the UAF window are commonly available to ordinary local audio/input-group users; while sysfs reconfig/unbind is root-owned, the highest-severity local scenario treats this as low privilege rather than init-namespace-only root, preferring the more severe PR value under uncertainty.\nUI:N - No separate victim action such as opening a file or mounting media is required; the attacker drives LED/mute activity and codec teardown from local userspace without tricking another user.\nS:U - Impact is confined to the host kernel\u2019s own authority (crash or memory corruption for local privilege escalation); there is no VM, IOMMU, or sandbox boundary crossing.\nC:H - The commit documents a use-after-free of LED classdev/set_brightness_delayed state over freed codec spec objects, which can be reclaimed and leveraged for arbitrary kernel memory disclosure.\nI:H - A UAF on the freed hda_gen_spec/LED callback path enables heap spray and corruption of adjacent kernel objects, yielding arbitrary write / control-flow hijack primitives.\nA:H - 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Unfortunately, it turned out that the devres\nrelease doesn't work for this case; namely, since the codec resource\nrelease happens before the devm call chain, it triggers a NULL\ndereference or a UAF for a stale set_brightness_delay callback.\n\nFor fixing the bug, this patch changes the LED class device register\nand unregister in a manual manner without devres, keeping the\ninstances in hda_gen_spec."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ALSA: hda: corrige UAF de los desarrolladores de clase LED al desvincularse. Los dispositivos de clase LED creados por controladores de c\u00f3dec de audio HD se registran a trav\u00e9s de devm_led_classdev_register() y se asocian con el audio HD. dispositivo c\u00f3dec. Desafortunadamente, result\u00f3 que la versi\u00f3n devres no funciona para este caso; es decir, dado que la liberaci\u00f3n del recurso del c\u00f3dec ocurre antes de la cadena de llamadas del desarrollador, desencadena una desreferencia NULL o un UAF para una devoluci\u00f3n de llamada obsoleta set_brightness_delay. Para corregir el error, este parche cambia el registro y cancelaci\u00f3n del registro del dispositivo de clase LED de forma manual sin devres, manteniendo las instancias en hda_gen_spec."}], "id": "CVE-2022-48735", "lastModified": "2026-08-04T10:17:18.493", "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": "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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-48735", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T17:10:50.919175Z", "version": "2.0.3"}}]}, "published": "2024-06-20T12:15:11.890", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0e629052f013eeb61494d4df2f1f647c2a9aef47"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/549f8ffc7b2f7561bea7f90930b6c5104318e87b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/813e9f3e06d22e29872d4fd51b54992d89cf66c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a7de1002135cf94367748ffc695a29812d7633b5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0e629052f013eeb61494d4df2f1f647c2a9aef47"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/549f8ffc7b2f7561bea7f90930b6c5104318e87b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/813e9f3e06d22e29872d4fd51b54992d89cf66c8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a7de1002135cf94367748ffc695a29812d7633b5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}, {"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2022:7683", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-425.3.1.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-11-08T00:00:00Z"}, {"advisory": "RHSA-2022:8267", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}, {"advisory": "RHSA-2022:8267", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}], "bugzilla": {"description": "kernel: ALSA: hda: Fix UAF of leds class devs at unbinding", "id": "2293324", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293324"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nALSA: hda: Fix UAF of leds class devs at unbinding\nThe LED class devices that are created by HD-audio codec drivers are\nregistered via devm_led_classdev_register() and associated with the\nHD-audio codec device. Unfortunately, it turned out that the devres\nrelease doesn't work for this case; namely, since the codec resource\nrelease happens before the devm call chain, it triggers a NULL\ndereference or a UAF for a stale set_brightness_delay callback.\nFor fixing the bug, this patch changes the LED class device register\nand unregister in a manual manner without devres, keeping the\ninstances in hda_gen_spec.", "A use-after-free vulnerability has been identified in the Linux kernel, specifically related to a stale set_brightness_delay callback function. This flaw can lead to compromised system availability. Due to the nature of use-after-free vulnerabilities, successful exploitation could result in unpredictable system behavior, crashes, or a denial-of-service condition."], "name": "CVE-2022-48735", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48735\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48735\nhttps://lore.kernel.org/linux-cve-announce/2024062001-CVE-2022-48735-32e6@gregkh/T"], "threat_severity": "Moderate"}

{}