{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47368", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T14:58:30.810Z", "datePublished": "2024-05-21T15:03:34.494Z", "dateUpdated": "2026-08-05T08:47:29.151Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:29.151Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires reading the local procfs file /proc/irq//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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/freescale/enetc/enetc.c" ], "versions": [ { "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "lessThan": "4c4c3052911b577920353a7646e4883d5da40c28", "status": "affected", "versionType": "git" }, { "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "lessThan": "6c3f1b741c6c2914ea120e3a5790d3e900152f7b", "status": "affected", "versionType": "git" }, { "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "lessThan": "6f329d9da2a5ae032fcde800a99b118124ed5270", "status": "affected", "versionType": "git" }, { "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "lessThan": "7237a494decfa17d0b9d0076e6cee3235719de90", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/freescale/enetc/enetc.c" ], "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.150", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.70", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.14.9", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.4.150" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.10.70" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.14.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.15" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/4c4c3052911b577920353a7646e4883d5da40c28" }, { "url": "https://git.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7b" }, { "url": "https://git.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270" }, { "url": "https://git.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90" } ], "title": "enetc: Fix illegal access when reading affinity_hint", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-400", "lang": "en", "description": "CWE-400 Uncontrolled Resource Consumption" } ] } ], "affected": [ { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "d4fd0404c1c9", "status": "affected", "lessThan": "4c4c3052911b", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "d4fd0404c1c9", "status": "affected", "lessThan": "6c3f1b741c6c", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "d4fd0404c1c9", "status": "affected", "lessThan": "6f329d9da2a5", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "d4fd0404c1c9", "status": "affected", "lessThan": "7237a494decf", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "5.1", "status": "affected" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "0", "status": "unaffected", "lessThan": "5.1", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "5.4.150", "status": "unaffected", "lessThanOrEqual": "5.4.*", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "5.10.70", "status": "unaffected", "lessThanOrEqual": "5.10.*", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "5.14.9", "status": "unaffected", "lessThanOrEqual": "5.14.*", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "5.15", "status": "unaffected" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-05T20:50:21.709936Z", "id": "CVE-2021-47368", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-05T20:50:27.716Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:08.655Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/4c4c3052911b577920353a7646e4883d5da40c28", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7b", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90", "tags": [ "x_transferred" ] } ] } ] } }