250 lines
13 KiB
JSON
250 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2022-48847",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-07-16T11:38:08.911Z",
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"datePublished": "2024-07-16T12:25:15.804Z",
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"dateUpdated": "2026-08-05T08:52:37.538Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:52:37.538Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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 >= sizeof(wfilter->type_filter) * 8)\n\nwhich is fine, but the second does:\n\n if (tf[i].type >= sizeof(wfilter->type_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->type_filter\n (2) Writing more elements in wfilter->filters[] 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 <TASK>\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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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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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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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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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 → 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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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/linux/watch_queue.h",
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"kernel/watch_queue.c"
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],
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"versions": [
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"status": "affected",
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"status": "affected",
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{
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"product": "Linux",
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"defaultStatus": "affected",
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"programFiles": [
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"include/linux/watch_queue.h",
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"kernel/watch_queue.c"
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],
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"versions": [
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{
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"version": "5.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.106",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.29",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.16.15",
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"lessThanOrEqual": "5.16.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.17",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"url": "https://git.kernel.org/stable/c/648895da69ced90ca770fd941c3d9479a9d72c16"
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}
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"id": "CVE-2022-48847",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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"version": "2.0.3",
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"dateUpdated": "2024-09-11T17:34:09.039Z"
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