250 lines
13 KiB
JSON
250 lines
13 KiB
JSON
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"cveId": "CVE-2022-48735",
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"dateReserved": "2024-06-20T11:09:39.053Z",
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"datePublished": "2024-06-20T11:13:22.065Z",
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"dateUpdated": "2026-08-05T08:52:02.428Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: hda: Fix UAF of leds class devs at unbinding\n\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.\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."
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"value": "AV:L - The bug is reached only through local HD-audio codec teardown (sysfs reconfig/clear, driver unbind, or module unload) and local LED/ALSA mute paths; it is not reachable from network packets or adjacent wireless frames.\nAC:L - On systems with HDA mute/micmute LED classdevs, unbinding deterministically frees codec->spec before delayed LED unregister/set_brightness work runs, and an attacker who can toggle mute LEDs controls the concurrent UAF side with no external timing dependency.\nPR:L - 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’s 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 - Even without full exploitation, the teardown path NULL-dereferences or UAFs in LED brightness callbacks and causes a kernel oops/panic, fully impacting availability."
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