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                "id": "CVE-2022-48847",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatch_queue: Fix filter limit check\n\nIn watch_queue_set_filter(), there are a couple of places where we check\nthat the filter type value does not exceed what the type_filter bitmap\ncan hold.  One place calculates the number of bits by:\n\n   if (tf[i].type \u003e= sizeof(wfilter-\u003etype_filter) * 8)\n\nwhich is fine, but the second does:\n\n   if (tf[i].type \u003e= sizeof(wfilter-\u003etype_filter) * BITS_PER_LONG)\n\nwhich is not.  This can lead to a couple of out-of-bounds writes due to\na too-large type:\n\n (1) __set_bit() on wfilter-\u003etype_filter\n (2) Writing more elements in wfilter-\u003efilters[] than we allocated.\n\nFix this by just using the proper WATCH_TYPE__NR instead, which is the\nnumber of types we actually know about.\n\nThe bug may cause an oops looking something like:\n\n  BUG: KASAN: slab-out-of-bounds in watch_queue_set_filter+0x659/0x740\n  Write of size 4 at addr ffff88800d2c66bc by task watch_queue_oob/611\n  ...\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x45/0x59\n   print_address_description.constprop.0+0x1f/0x150\n   ...\n   kasan_report.cold+0x7f/0x11b\n   ...\n   watch_queue_set_filter+0x659/0x740\n   ...\n   __x64_sys_ioctl+0x127/0x190\n   do_syscall_64+0x43/0x90\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n  Allocated by task 611:\n   kasan_save_stack+0x1e/0x40\n   __kasan_kmalloc+0x81/0xa0\n   watch_queue_set_filter+0x23a/0x740\n   __x64_sys_ioctl+0x127/0x190\n   do_syscall_64+0x43/0x90\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n  The buggy address belongs to the object at ffff88800d2c66a0\n   which belongs to the cache kmalloc-32 of size 32\n  The buggy address is located 28 bytes inside of\n   32-byte region [ffff88800d2c66a0, ffff88800d2c66c0)"
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - The bug is reached through local syscalls only: pipe2(O_NOTIFICATION_PIPE) followed by ioctl(IOC_WATCH_QUEUE_SET_FILTER) into pipe_ioctl \u2192 watch_queue_set_filter; there is no network or adjacent-protocol path.\nAC:L - An attacker fully controls the filter type and payload fields and can reliably trigger the mismatched bounds check (type in [128,1023] on 64-bit); CONFIG_WATCH_QUEUE is enabled on major distros such as Ubuntu and Fedora, and no victim-controlled conditions are required.\nPR:L - Creating a notification pipe and setting its filter require only an unprivileged local account; neither pipe2(O_NOTIFICATION_PIPE) nor IOC_WATCH_QUEUE_SET_FILTER performs capability or privilege checks.\nUI:N - Exploitation needs no victim action; the attacker issues the pipe2/ioctl sequence themselves.\nS:U - Impact stays within the host kernel authority (local privilege escalation via slab corruption); this is not a VM/IOMMU/sandbox boundary escape.\nC:H - The heap out-of-bounds write with attacker-controlled contents corrupts adjacent slab objects and has been demonstrated as a privilege-escalation primitive, enabling arbitrary kernel memory disclosure.\nI:H - Attacker-controlled OOB writes via filters[] and __set_bit provide a strong integrity primitive; a public exploit achieved root on Fedora 35 by corrupting adjacent kmalloc-32 objects.\nA:H - The same corruption causes kernel oopses (KASAN slab-out-of-bounds) and can panic or hang the system, as shown in the original report and exploit."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-48847",
    "datePublished": "2024-07-16T12:25:15.804Z",
    "dateReserved": "2024-07-16T11:38:08.911Z",
    "dateUpdated": "2026-08-05T08:52:37.538Z",
    "state": "PUBLISHED"
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