CVE-2021-47368 (GCVE-0-2021-47368)
Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2026-08-05 08:47
VLAI
EPSS
VEX
Title
enetc: Fix illegal access when reading affinity_hint
Summary
In the Linux kernel, the following vulnerability has been resolved:
enetc: Fix illegal access when reading affinity_hint
irq_set_affinity_hit() stores a reference to the cpumask_t
parameter in the irq descriptor, and that reference can be
accessed later from irq_affinity_hint_proc_show(). Since
the cpu_mask parameter passed to irq_set_affinity_hit() has
only temporary storage (it's on the stack memory), later
accesses to it are illegal. Thus reads from the corresponding
procfs affinity_hint file can result in paging request oops.
The issue is fixed by the get_cpu_mask() helper, which provides
a permanent storage for the cpumask_t parameter.
Severity
7.1 (High)
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-05 20:50 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
12 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
d4fd0404c1c95b17880f254ebfee3485693fa8ba , < 4c4c3052911b577920353a7646e4883d5da40c28
(git)
Affected: d4fd0404c1c95b17880f254ebfee3485693fa8ba , < 6c3f1b741c6c2914ea120e3a5790d3e900152f7b (git) Affected: d4fd0404c1c95b17880f254ebfee3485693fa8ba , < 6f329d9da2a5ae032fcde800a99b118124ed5270 (git) Affected: d4fd0404c1c95b17880f254ebfee3485693fa8ba , < 7237a494decfa17d0b9d0076e6cee3235719de90 (git) |
guessed | |
| Linux | Linux |
Affected:
5.1
Unaffected: 0 , < 5.1 (semver) Unaffected: 5.4.150 , ≤ 5.4.* (semver) Unaffected: 5.10.70 , ≤ 5.10.* (semver) Unaffected: 5.14.9 , ≤ 5.14.* (semver) Unaffected: 5.15 , ≤ * (original_commit_for_fix) |
guessed | |
| linux | linux_kernel |
Affected:
d4fd0404c1c9 , < 4c4c3052911b
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
d4fd0404c1c9 , < 6c3f1b741c6c
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
d4fd0404c1c9 , < 6f329d9da2a5
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
d4fd0404c1c9 , < 7237a494decf
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
5.1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
0 , < 5.1
(custom)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.4.150 , ≤ 5.4.*
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.10.70 , ≤ 5.10.*
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.14.9 , ≤ 5.14.*
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.15
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
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"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\u0027s 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": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires reading the local procfs file /proc/irq/\u003cN\u003e/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\u0027s 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-\u003elock with IRQs disabled, which can panic or hang the system."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T08:47:29.151Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47368",
"datePublished": "2024-05-21T15:03:34.494Z",
"dateReserved": "2024-05-21T14:58:30.810Z",
"dateUpdated": "2026-08-05T08:47:29.151Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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