434 lines
20 KiB
JSON
434 lines
20 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-2021-47368",
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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": "2024-05-21T14:58:30.810Z",
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"datePublished": "2024-05-21T15:03:34.494Z",
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"dateUpdated": "2026-08-05T08:47:29.151Z"
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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": "2026-08-05T08:47:29.151Z"
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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\nenetc: Fix illegal access when reading affinity_hint\n\nirq_set_affinity_hit() stores a reference to the cpumask_t\nparameter in the irq descriptor, and that reference can be\naccessed later from irq_affinity_hint_proc_show(). Since\nthe cpu_mask parameter passed to irq_set_affinity_hit() has\nonly temporary storage (it's on the stack memory), later\naccesses to it are illegal. Thus reads from the corresponding\nprocfs affinity_hint file can result in paging request oops.\n\nThe issue is fixed by the get_cpu_mask() helper, which provides\na permanent storage for the cpumask_t parameter."
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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:N/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 - Exploitation requires reading the local procfs file /proc/irq/<N>/affinity_hint; the dangling pointer is only dereferenced in irq_affinity_hint_proc_show() and is not reachable from network packet processing.\nAC:L - Once the ENETC interface is up (normal boot/ifup installs the stale hint in enetc_setup_irqs), a single cat of affinity_hint deterministically dereferences the dangling stack pointer with no race or attacker-uncontrolled memory layout to guess.\nPR:L - affinity_hint is created with mode 0444 (S_IRUGO), so any unprivileged local user can read it; the dangling pointer is installed by privileged ifup as part of normal operation, not by the attacker.\nUI:N - The attacker directly reads the procfs entry; no victim action is required because the ENETC interface is already brought up during normal system operation.\nS:U - The stale pointer dereference and resulting leak/oops remain entirely within the kernel's security authority, with no VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - This is a use-after-free read of freed/reused kernel stack memory that cpumask_copy() copies out to unprivileged userspace via seq_printf, enabling repeatable disclosure of kernel stack contents including pointers that can defeat KASLR.\nI:N - The affinity_hint pointer is only stored, read, and cleared; nothing writes through the stale pointer and it is never used as a function pointer, so the attacker gains no kernel-state modification capability.\nA:H - As stated in the fix, reading affinity_hint can cause a paging-request oops when the referenced stack memory has been unmapped (e.g. under VMAP_STACK), and the fault occurs while holding desc->lock with IRQs disabled, which can panic or hang the system."
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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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"drivers/net/ethernet/freescale/enetc/enetc.c"
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],
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"versions": [
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{
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"version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba",
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"lessThan": "4c4c3052911b577920353a7646e4883d5da40c28",
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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": "d4fd0404c1c95b17880f254ebfee3485693fa8ba",
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"status": "affected",
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{
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"status": "affected",
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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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"drivers/net/ethernet/freescale/enetc/enetc.c"
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],
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"versions": [
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{
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"version": "5.1",
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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": "5.1",
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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": "5.4.150",
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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": "5.10.70",
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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": "5.14.9",
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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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{
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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": "5.1",
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"versionEndExcluding": "5.4.150"
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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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}
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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/4c4c3052911b577920353a7646e4883d5da40c28"
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},
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{
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"url": "https://git.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7b"
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},
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{
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"url": "https://git.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270"
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},
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{
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"url": "https://git.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90"
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}
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],
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"title": "enetc: Fix illegal access when reading affinity_hint",
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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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{
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{
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"type": "CWE",
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"cweId": "CWE-400",
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"lang": "en",
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"description": "CWE-400 Uncontrolled Resource Consumption"
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}
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]
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}
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"content": {
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"timestamp": "2024-06-05T20:50:21.709936Z",
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"id": "CVE-2021-47368",
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"options": [
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{
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