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vuln-cve/data/2024/27xxx/CVE-2024-27043.json
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{
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"cveMetadata": {
"cveId": "CVE-2024-27043",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-02-19T14:20:24.212Z",
"datePublished": "2024-05-01T12:54:11.197Z",
"dateUpdated": "2026-08-05T11:29:10.999Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: edia: dvbdev: fix a use-after-free\n\nIn dvb_register_device, *pdvbdev is set equal to dvbdev, which is freed\nin several error-handling paths. However, *pdvbdev is not set to NULL\nafter dvbdev's deallocation, causing use-after-frees in many places,\nfor example, in the following call chain:\n\nbudget_register\n |-> dvb_dmxdev_init\n |-> dvb_register_device\n |-> dvb_dmxdev_release\n |-> dvb_unregister_device\n |-> dvb_remove_device\n |-> dvb_device_put\n |-> kref_put\n\nWhen calling dvb_unregister_device, dmxdev->dvbdev (i.e. *pdvbdev in\ndvb_register_device) could point to memory that had been freed in\ndvb_register_device. Thereafter, this pointer is transferred to\nkref_put and triggering a use-after-free."
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"value": "AV:L - The vulnerable code is in dvb-core adapter registration, reached through local device probe/re-probe of a DVB adapter, with the error condition (kmalloc failure or DVB minor exhaustion) driven by a local unprivileged process inducing memory/resource pressure. No network or adjacent-network path exists, but the trigger does not require physical access on systems where a local user can force a re-probe of an already-present tuner.\nAC:L - There is no race the attacker must lose; the attacker controls both sides — memory pressure to force the GFP_KERNEL failure paths, and registration attempts to hit them, plus the deterministic MAX_DVB_MINORS exhaustion path under CONFIG_DVB_DYNAMIC_MINORS. Per the UAF guidance, a use-after-free with attacker-influenceable triggering conditions is Low.\nPR:L - A basic unprivileged local account suffices to generate the memory pressure that forces the error paths and to drive repeated registration attempts; no CAP_SYS_ADMIN or root in the init namespace is required to reach dvb-core's registration failure handling.\nUI:N - No victim action is needed — the attacker drives both the allocation failure and the device registration attempt themselves, and the stale pointer is consumed automatically by the driver's own error-unwind path.\nS:U - The corruption is confined to kernel heap and kernel static data within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The dangling struct dvb_device is dereferenced after free (dmxdev->dvbdev->users, ->wait_queue, ->minor), so heap-spray reallocation of that slab object gives the attacker control over the freed contents and, via the list_del unlink and wait-queue callback primitives, a route to arbitrary kernel memory disclosure.\nI:H - The use-after-free yields multiple write primitives: list_del() on freed memory is a classic write-what-where unlink, dvb_minors[dvbdev->minor] = NULL writes at an attacker-chosen offset from a static array, and kref_put() double-frees the object — collectively sufficient for control-flow hijack and privilege escalation.\nA:H - Even without full exploitation, dereferencing and kfree()ing already-freed memory reliably produces slab corruption, a double free, and out-of-bounds writes, resulting in kernel oops or panic."
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