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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: core: Fix NULL module pointer assignment at card init\n\nThe commit 81033c6b584b (\"ALSA: core: Warn on empty module\")\nintroduced a WARN_ON() for a NULL module pointer passed at snd_card\nobject creation, and it also wraps the code around it with \u0027#ifdef\nMODULE\u0027.  This works in most cases, but the devils are always in\ndetails.  \"MODULE\" is defined when the target code (i.e. the sound\ncore) is built as a module; but this doesn\u0027t mean that the caller is\nalso built-in or not.  Namely, when only the sound core is built-in\n(CONFIG_SND=y) while the driver is a module (CONFIG_SND_USB_AUDIO=m),\nthe passed module pointer is ignored even if it\u0027s non-NULL, and\ncard-\u003emodule remains as NULL.  This would result in the missing module\nreference up/down at the device open/close, leading to a race with the\ncode execution after the module removal.\n\nFor addressing the bug, move the assignment of card-\u003emodule again out\nof ifdef.  The WARN_ON() is still wrapped with ifdef because the\nmodule can be really NULL when all sound drivers are built-in.\n\nNote that we keep \u0027ifdef MODULE\u0027 for WARN_ON(), otherwise it would\nlead to a false-positive NULL module check.  Admittedly it won\u0027t catch\nperfectly, i.e. no check is performed when CONFIG_SND=y.  But, it\u0027s no\nreal problem as it\u0027s only for debugging, and the condition is pretty\nrare."
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              "value": "AV:L - Exploitation requires opening a local ALSA device node (/dev/snd/pcmC*D*, controlC*, hwC*D*, timer, or an OSS/proc equivalent); there is no network-reachable path into snd_card_init or the affected open handlers.\nAC:L - The affected configuration (CONFIG_SND=y with a driver built as a module) is a shipped mainline defconfig, and the attacker deterministically creates the dangling state simply by holding an fd open \u2014 no memory-layout luck or unwinnable race is needed for the stale function-pointer call on release.\nPR:L - Only ordinary access to /dev/snd is needed, which is granted to the logged-in local user via session ACLs or the audio group on desktops and to the audio/media UID on Android \u2014 no capability is required to open the device and defeat the module-reference interlock.\nUI:N - No victim must be tricked into any action; the module removal that triggers the use-after-free occurs autonomously during routine driver updates, power-management, and hotplug scripts, and the attacker\u0027s own open() is what removes the safety interlock.\nS:U - The corruption and its consequences are confined to the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The card, substream, kcontrol and hwdep objects retain pointers into freed module text and data, so reads through those stale pointers disclose whatever now occupies the reclaimed module region, and a use-after-free of this class is leverageable into arbitrary kernel memory disclosure.\nI:H - Release and teardown perform indirect calls through substream-\u003eops and card-\u003eprivate_free into freed module memory that can be reallocated with attacker-influenced content, yielding a control-flow hijack primitive rather than a simple fault.\nA:H - Even without weaponization, dereferencing freed module text on close reliably oopses or panics the kernel, and the attacker can arrange this repeatedly."
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    "dateReserved": "2024-06-18T19:36:34.934Z",
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