340 lines
19 KiB
JSON
340 lines
19 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-2021-47118",
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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": "2024-03-04T18:12:48.838Z",
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"datePublished": "2024-03-15T20:14:25.116Z",
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"dateUpdated": "2026-05-11T13:48:23.853Z"
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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": "2026-05-11T13:48:23.853Z"
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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\npid: take a reference when initializing `cad_pid`\n\nDuring boot, kernel_init_freeable() initializes `cad_pid` to the init\ntask's struct pid. Later on, we may change `cad_pid` via a sysctl, and\nwhen this happens proc_do_cad_pid() will increment the refcount on the\nnew pid via get_pid(), and will decrement the refcount on the old pid\nvia put_pid(). As we never called get_pid() when we initialized\n`cad_pid`, we decrement a reference we never incremented, can therefore\nfree the init task's struct pid early. As there can be dangling\nreferences to the struct pid, we can later encounter a use-after-free\n(e.g. when delivering signals).\n\nThis was spotted when fuzzing v5.13-rc3 with Syzkaller, but seems to\nhave been around since the conversion of `cad_pid` to struct pid in\ncommit 9ec52099e4b8 (\"[PATCH] replace cad_pid by a struct pid\") from the\npre-KASAN stone age of v2.6.19.\n\nFix this by getting a reference to the init task's struct pid when we\nassign it to `cad_pid`.\n\nFull KASAN splat below.\n\n ==================================================================\n BUG: KASAN: use-after-free in ns_of_pid include/linux/pid.h:153 [inline]\n BUG: KASAN: use-after-free in task_active_pid_ns+0xc0/0xc8 kernel/pid.c:509\n Read of size 4 at addr ffff23794dda0004 by task syz-executor.0/273\n\n CPU: 1 PID: 273 Comm: syz-executor.0 Not tainted 5.12.0-00001-g9aef892b2d15 #1\n Hardware name: linux,dummy-virt (DT)\n Call trace:\n ns_of_pid include/linux/pid.h:153 [inline]\n task_active_pid_ns+0xc0/0xc8 kernel/pid.c:509\n do_notify_parent+0x308/0xe60 kernel/signal.c:1950\n exit_notify kernel/exit.c:682 [inline]\n do_exit+0x2334/0x2bd0 kernel/exit.c:845\n do_group_exit+0x108/0x2c8 kernel/exit.c:922\n get_signal+0x4e4/0x2a88 kernel/signal.c:2781\n do_signal arch/arm64/kernel/signal.c:882 [inline]\n do_notify_resume+0x300/0x970 arch/arm64/kernel/signal.c:936\n work_pending+0xc/0x2dc\n\n Allocated by task 0:\n slab_post_alloc_hook+0x50/0x5c0 mm/slab.h:516\n slab_alloc_node mm/slub.c:2907 [inline]\n slab_alloc mm/slub.c:2915 [inline]\n kmem_cache_alloc+0x1f4/0x4c0 mm/slub.c:2920\n alloc_pid+0xdc/0xc00 kernel/pid.c:180\n copy_process+0x2794/0x5e18 kernel/fork.c:2129\n kernel_clone+0x194/0x13c8 kernel/fork.c:2500\n kernel_thread+0xd4/0x110 kernel/fork.c:2552\n rest_init+0x44/0x4a0 init/main.c:687\n arch_call_rest_init+0x1c/0x28\n start_kernel+0x520/0x554 init/main.c:1064\n 0x0\n\n Freed by task 270:\n slab_free_hook mm/slub.c:1562 [inline]\n slab_free_freelist_hook+0x98/0x260 mm/slub.c:1600\n slab_free mm/slub.c:3161 [inline]\n kmem_cache_free+0x224/0x8e0 mm/slub.c:3177\n put_pid.part.4+0xe0/0x1a8 kernel/pid.c:114\n put_pid+0x30/0x48 kernel/pid.c:109\n proc_do_cad_pid+0x190/0x1b0 kernel/sysctl.c:1401\n proc_sys_call_handler+0x338/0x4b0 fs/proc/proc_sysctl.c:591\n proc_sys_write+0x34/0x48 fs/proc/proc_sysctl.c:617\n call_write_iter include/linux/fs.h:1977 [inline]\n new_sync_write+0x3ac/0x510 fs/read_write.c:518\n vfs_write fs/read_write.c:605 [inline]\n vfs_write+0x9c4/0x1018 fs/read_write.c:585\n ksys_write+0x124/0x240 fs/read_write.c:658\n __do_sys_write fs/read_write.c:670 [inline]\n __se_sys_write fs/read_write.c:667 [inline]\n __arm64_sys_write+0x78/0xb0 fs/read_write.c:667\n __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]\n invoke_syscall arch/arm64/kernel/syscall.c:49 [inline]\n el0_svc_common.constprop.1+0x16c/0x388 arch/arm64/kernel/syscall.c:129\n do_el0_svc+0xf8/0x150 arch/arm64/kernel/syscall.c:168\n el0_svc+0x28/0x38 arch/arm64/kernel/entry-common.c:416\n el0_sync_handler+0x134/0x180 arch/arm64/kernel/entry-common.c:432\n el0_sync+0x154/0x180 arch/arm64/kernel/entry.S:701\n\n The buggy address belongs to the object at ffff23794dda0000\n which belongs to the cache pid of size 224\n The buggy address is located 4 bytes inside of\n 224-byte region [ff\n---truncated---"
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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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"init/main.c"
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],
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"versions": [
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{
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"version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "764c2e892d1fe895392aff62fb353fdce43bb529",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "f86c80515a8a3703e0ca2e56deb50fc2879c5ea4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "4dbd8808a591b49b717862e6e0081bcf14a87788",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "d106f05432e60f9f62d456ef017687f5c73cb414",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "2cd6eedfa6344f5ef5c3dac3aee57a39b5b46dff",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "7178be006d495ffb741c329012da289b62dddfe6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "b8ff869f20152fbe66b6c2e2715d26a2f9897cca",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
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"lessThan": "0711f0d7050b9e07c44bc159bbc64ac0a1022c7f",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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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"init/main.c"
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],
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"versions": [
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{
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"version": "2.6.19",
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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": "2.6.19",
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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": "4.4.272",
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"lessThanOrEqual": "4.4.*",
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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": "4.9.272",
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"lessThanOrEqual": "4.9.*",
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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": "4.14.236",
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"lessThanOrEqual": "4.14.*",
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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": "4.19.194",
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"lessThanOrEqual": "4.19.*",
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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": "5.4.125",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.43",
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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": "5.12.10",
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"lessThanOrEqual": "5.12.*",
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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": "5.13",
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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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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.19",
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"versionEndExcluding": "4.4.272"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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"versionEndExcluding": "4.19.194"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
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},
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]
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/764c2e892d1fe895392aff62fb353fdce43bb529"
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},
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{
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"url": "https://git.kernel.org/stable/c/f86c80515a8a3703e0ca2e56deb50fc2879c5ea4"
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},
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{
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"url": "https://git.kernel.org/stable/c/4dbd8808a591b49b717862e6e0081bcf14a87788"
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},
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{
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"url": "https://git.kernel.org/stable/c/d106f05432e60f9f62d456ef017687f5c73cb414"
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},
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{
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"url": "https://git.kernel.org/stable/c/2cd6eedfa6344f5ef5c3dac3aee57a39b5b46dff"
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},
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{
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"url": "https://git.kernel.org/stable/c/7178be006d495ffb741c329012da289b62dddfe6"
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},
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{
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"url": "https://git.kernel.org/stable/c/b8ff869f20152fbe66b6c2e2715d26a2f9897cca"
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},
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{
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"url": "https://git.kernel.org/stable/c/0711f0d7050b9e07c44bc159bbc64ac0a1022c7f"
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}
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],
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"title": "pid: take a reference when initializing `cad_pid`",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2024-08-04T05:24:39.826Z"
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},
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/764c2e892d1fe895392aff62fb353fdce43bb529",
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"url": "https://git.kernel.org/stable/c/d106f05432e60f9f62d456ef017687f5c73cb414",
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"url": "https://git.kernel.org/stable/c/7178be006d495ffb741c329012da289b62dddfe6",
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"tags": [
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{
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"url": "https://git.kernel.org/stable/c/b8ff869f20152fbe66b6c2e2715d26a2f9897cca",
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"tags": [
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"url": "https://git.kernel.org/stable/c/0711f0d7050b9e07c44bc159bbc64ac0a1022c7f",
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"tags": [
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]
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2021-47118",
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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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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-09-10T15:55:32.497500Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-11T17:33:25.590Z"
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}
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}
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]
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}
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} |