221 lines
11 KiB
JSON
221 lines
11 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-2021-47461",
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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": "2024-05-22T06:20:56.197Z",
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"datePublished": "2024-05-22T06:23:22.373Z",
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"dateUpdated": "2026-08-05T08:47:57.329Z"
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},
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:47:57.329Z"
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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\nuserfaultfd: fix a race between writeprotect and exit_mmap()\n\nA race is possible when a process exits, its VMAs are removed by\nexit_mmap() and at the same time userfaultfd_writeprotect() is called.\n\nThe race was detected by KASAN on a development kernel, but it appears\nto be possible on vanilla kernels as well.\n\nUse mmget_not_zero() to prevent the race as done in other userfaultfd\noperations."
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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 only via the local userfaultfd(2) syscall and UFFDIO_WRITEPROTECT ioctl into userfaultfd_writeprotect()/mwriteprotect_range(), not via network packet processing or physical device I/O.\nAC:L - The attacker fully controls both sides of the race by creating a userfaultfd, registering a WP range, sharing the fd (fork/SCM_RIGHTS), exiting the mm owner so exit_mmap() frees VMAs, and concurrently issuing UFFDIO_WRITEPROTECT from the fd holder.\nPR:L - Any unprivileged user can open userfaultfd with UFFD_USER_MODE_ONLY (allowed by default) and use UFFDIO_WRITEPROTECT; CAP_SYS_PTRACE is not required for this path.\nUI:N - The attacker performs the uffd setup, fd sharing, process exit, and ioctl hammering themselves; no separate victim action is required.\nS:U - This is a standard in-kernel VMA use-after-free within the host kernel authority, with no VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - The race is a use-after-free on VMA structures (KASAN-detected) while find_vma/change_protection still touch them; UAF enables reclaim/spray and arbitrary kernel memory disclosure.\nI:H - Use-after-free of VMAs during change_protection allows heap manipulation of VMA state that drives page-table writes, enabling arbitrary write and control-flow hijacking primitives.\nA:H - Concurrent exit_mmap() freeing of VMAs while mwriteprotect_range() walks and modifies them causes kernel oops/panic even when not fully exploited for code execution."
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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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"fs/userfaultfd.c"
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],
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"versions": [
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{
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"version": "63b2d4174c4ad1f40b48d7138e71bcb564c1fe03",
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"defaultStatus": "affected",
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"programFiles": [
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"fs/userfaultfd.c"
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],
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"versions": [
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{
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"version": "5.7",
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"status": "affected"
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{
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"version": "0",
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"lessThan": "5.7",
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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": "5.10.76",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.14.15",
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"lessThanOrEqual": "5.14.*",
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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": "5.15",
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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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"references": [
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"url": "https://git.kernel.org/stable/c/3cda4bfffd4f755645577aaa9e96a606657b4525"
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"url": "https://git.kernel.org/stable/c/149958ecd0627a9f1e9c678c25c665400054cd6a"
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}
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],
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"title": "userfaultfd: fix a race between writeprotect and exit_mmap()",
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"id": "CVE-2021-47461",
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