{"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/<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."}]}], "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": 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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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "lessThan": "4c4c3052911b577920353a7646e4883d5da40c28", "versionType": "git"}, {"status": "affected", "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "lessThan": "6c3f1b741c6c2914ea120e3a5790d3e900152f7b", "versionType": "git"}, {"status": "affected", "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "lessThan": "6f329d9da2a5ae032fcde800a99b118124ed5270", "versionType": "git"}, {"status": "affected", "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "lessThan": "7237a494decfa17d0b9d0076e6cee3235719de90", "versionType": "git"}], "programFiles": ["drivers/net/ethernet/freescale/enetc/enetc.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.1"}, {"status": "unaffected", "version": "0", "lessThan": "5.1", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.150", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.70", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.14.9", "versionType": "semver", "lessThanOrEqual": "5.14.*"}, {"status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/ethernet/freescale/enetc/enetc.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.150", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.70", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14.9", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15", "versionStartIncluding": "5.1"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:29.151Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47368", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:47:29.151Z", "dateReserved": "2024-05-21T14:58:30.810Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T15:03:34.494Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/freescale/enetc/enetc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4c4c3052911b577920353a7646e4883d5da40c28", "status": "affected", "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "versionType": "git"}, {"lessThan": "6c3f1b741c6c2914ea120e3a5790d3e900152f7b", "status": "affected", "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "versionType": "git"}, {"lessThan": "6f329d9da2a5ae032fcde800a99b118124ed5270", "status": "affected", "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "versionType": "git"}, {"lessThan": "7237a494decfa17d0b9d0076e6cee3235719de90", "status": "affected", "version": "d4fd0404c1c95b17880f254ebfee3485693fa8ba", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/freescale/enetc/enetc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.1"}, {"lessThan": "5.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.150", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.70", "versionType": "semver"}, {"lessThanOrEqual": "5.14.*", "status": "unaffected", "version": "5.14.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"affectedData": [{"cpes": ["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "linux_kernel", "vendor": "linux", "versions": [{"lessThan": "4c4c3052911b", "status": "affected", "version": "d4fd0404c1c9", "versionType": "custom"}]}, {"cpes": ["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "linux_kernel", "vendor": "linux", "versions": [{"lessThan": "6c3f1b741c6c", "status": "affected", "version": "d4fd0404c1c9", "versionType": "custom"}]}, {"cpes": ["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "linux_kernel", "vendor": "linux", "versions": [{"lessThan": "6f329d9da2a5", "status": "affected", "version": "d4fd0404c1c9", "versionType": "custom"}]}, {"cpes": ["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "linux_kernel", "vendor": "linux", "versions": [{"lessThan": "7237a494decf", "status": "affected", "version": "d4fd0404c1c9", "versionType": "custom"}]}, {"cpes": ["cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "linux_kernel", "vendor": "linux", "versions": [{"status": "affected", "version": "5.1"}]}, {"cpes": ["cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "linux_kernel", "vendor": "linux", "versions": [{"lessThan": "5.1", "status": "unaffected", "version": "0", "versionType": "custom"}]}, {"cpes": ["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "linux_kernel", "vendor": "linux", "versions": [{"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.150", "versionType": "custom"}]}, {"cpes": ["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "linux_kernel", "vendor": "linux", "versions": [{"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.70", "versionType": "custom"}]}, {"cpes": ["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "linux_kernel", "vendor": "linux", "versions": [{"lessThanOrEqual": "5.14.*", "status": "unaffected", "version": "5.14.9", "versionType": "custom"}]}, {"cpes": ["cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "linux_kernel", "vendor": "linux", "versions": [{"status": "unaffected", "version": "5.15"}]}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6C41E865-07A4-4D63-A20A-0BB6C0451FB2", "versionEndExcluding": "5.4.150", "versionStartIncluding": "5.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A2A50090-4483-4F44-9147-BF0B012FBF7E", "versionEndExcluding": "5.10.70", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1B31D6C1-A751-438D-906B-0C56B789D498", "versionEndExcluding": "5.14.9", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*", "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*", "matchCriteriaId": "60134C3A-06E4-48C1-B04F-2903732A4E56", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: enetc: corrige el acceso ilegal al leer affinity_hint irq_set_affinity_hit() almacena una referencia al par\u00e1metro cpumask_t en el descriptor irq, y se puede acceder a esa referencia m\u00e1s tarde desde irq_affinity_hint_proc_show(). Dado que el par\u00e1metro cpu_mask pasado a irq_set_affinity_hit() solo tiene almacenamiento temporal (est\u00e1 en la memoria de la pila), los accesos posteriores a \u00e9l son ilegales. Por lo tanto, las lecturas del archivo procfs affinity_hint correspondiente pueden dar como resultado una solicitud de paginaci\u00f3n. El problema lo soluciona el asistente get_cpu_mask(), que proporciona un almacenamiento permanente para el par\u00e1metro cpumask_t."}], "id": "CVE-2021-47368", "lastModified": "2026-06-17T04:17:18.480", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47368", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-05T20:50:21.709936Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:22.773", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c4c3052911b577920353a7646e4883d5da40c28"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c4c3052911b577920353a7646e4883d5da40c28"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: enetc: Fix illegal access when reading affinity_hint", "id": "2282378", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282378"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nenetc: Fix illegal access when reading affinity_hint\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.\nThe issue is fixed by the get_cpu_mask() helper, which provides\na permanent storage for the cpumask_t parameter."], "name": "CVE-2021-47368", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47368\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47368\nhttps://lore.kernel.org/linux-cve-announce/2024052139-CVE-2021-47368-1290@gregkh/T"], "threat_severity": "Low"}

{}