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-2021-47226",
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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": "2024-04-10T18:59:19.529Z",
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"datePublished": "2024-05-21T14:19:30.864Z",
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"dateUpdated": "2026-08-05T08:46:49.937Z"
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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": "2026-08-05T08:46:49.937Z"
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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\nx86/fpu: Invalidate FPU state after a failed XRSTOR from a user buffer\n\nBoth Intel and AMD consider it to be architecturally valid for XRSTOR to\nfail with #PF but nonetheless change the register state. The actual\nconditions under which this might occur are unclear [1], but it seems\nplausible that this might be triggered if one sibling thread unmaps a page\nand invalidates the shared TLB while another sibling thread is executing\nXRSTOR on the page in question.\n\n__fpu__restore_sig() can execute XRSTOR while the hardware registers\nare preserved on behalf of a different victim task (using the\nfpu_fpregs_owner_ctx mechanism), and, in theory, XRSTOR could fail but\nmodify the registers.\n\nIf this happens, then there is a window in which __fpu__restore_sig()\ncould schedule out and the victim task could schedule back in without\nreloading its own FPU registers. This would result in part of the FPU\nstate that __fpu__restore_sig() was attempting to load leaking into the\nvictim task's user-visible state.\n\nInvalidate preserved FPU registers on XRSTOR failure to prevent this\nsituation from corrupting any state.\n\n[1] Frequent readers of the errata lists might imagine \"complex\n microarchitectural conditions\"."
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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:N/I:H/A:H",
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"baseScore": 7.1,
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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 vulnerable path is reached only via the local rt_sigreturn/sigreturn syscalls into __fpu__restore_sig(); it cannot be triggered by network packets or remote protocols.\nAC:L - An unprivileged attacker can reliably set up both sides of the race (one thread performing sigreturn XRSTOR while a sibling unmaps the buffer/TLB) and retry until the architecturally allowed partial XRSTOR-on-#PF occurs.\nPR:L - Any unprivileged local user can invoke rt_sigreturn and supply a crafted signal frame; no capabilities or root privileges are required.\nUI:N - Exploitation requires only the attacker's own threads and normal scheduling alongside other tasks; no separate victim user action is needed.\nS:U - Impact stays within the kernel's process-management authority (cross-task FPU register corruption on the same OS); this is not a VM/hypervisor or IOMMU boundary escape.\nC:N - The flaw injects attacker-controlled FPU/SIMD state into another task's registers; it does not provide a primitive for the attacker to read victim or kernel memory.\nI:H - Failed XRSTOR can write attacker-chosen user xstate (FP/SSE/AVX and related features) into hardware registers still attributed to a victim task, which then resumes with corrupted, attacker-influenced register state.\nA:H - Corrupting another task's FPU/MXCSR/SIMD state can cause that process to fault, abort, or otherwise fail, enabling cross-process denial of service."
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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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"arch/x86/kernel/fpu/signal.c"
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],
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"versions": [
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{
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"version": "1d731e731c4cd7cbd3b1aa295f0932e7610da82f",
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"lessThan": "a7748e021b9fb7739e3cb88449296539de0b6817",
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"status": "affected",
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"product": "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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"arch/x86/kernel/fpu/signal.c"
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],
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"versions": [
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"version": "5.2",
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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": "5.2",
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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": "5.10.46",
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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": "5.12.13",
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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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"cpeApplicability": [
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"references": [
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"url": "https://git.kernel.org/stable/c/a7748e021b9fb7739e3cb88449296539de0b6817"
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}
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],
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"title": "x86/fpu: Invalidate FPU state after a failed XRSTOR from a user buffer",
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"version": "2.0.3",
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"timestamp": "2024-05-21T15:36:03.024870Z"
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"dateUpdated": "2024-06-04T17:15:21.177Z"
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