CVE-2021-47520 (GCVE-0-2021-47520)
Vulnerability from cvelistv5 – Published: 2024-05-24 15:09 – Updated: 2026-08-05 08:48
VLAI
EPSS
VEX
Title
can: pch_can: pch_can_rx_normal: fix use after free
Summary
In the Linux kernel, the following vulnerability has been resolved:
can: pch_can: pch_can_rx_normal: fix use after free
After calling netif_receive_skb(skb), dereferencing skb is unsafe.
Especially, the can_frame cf which aliases skb memory is dereferenced
just after the call netif_receive_skb(skb).
Reordering the lines solves the issue.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-17 18:03 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
b21d18b51b31a24d17f883b678432fbdee3d5675 , < bafe343a885c70dddf358379cf0b2a1c07355d8d
(git)
Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < 3a3c46e2eff0577454860a203be1a8295f4acb76 (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < affbad02bf80380a7403885b9fe4a1587d1bb4f3 (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < 3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < abb4eff3dcd2e583060082a18a8dbf31f02689d4 (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < 703dde112021c93d6e89443c070e7dbd4dea612e (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < 6c73fc931658d8cbc8a1714b326cb31eb71d16a7 (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < 94cddf1e9227a171b27292509d59691819c458db (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.37
Unaffected: 0 , < 2.6.37 (semver) Unaffected: 4.4.295 , ≤ 4.4.* (semver) Unaffected: 4.9.293 , ≤ 4.9.* (semver) Unaffected: 4.14.258 , ≤ 4.14.* (semver) Unaffected: 4.19.221 , ≤ 4.19.* (semver) Unaffected: 5.4.165 , ≤ 5.4.* (semver) Unaffected: 5.10.85 , ≤ 5.10.* (semver) Unaffected: 5.15.8 , ≤ 5.15.* (semver) Unaffected: 5.16 , ≤ * (original_commit_for_fix) |
guessed |
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.165",
"versionStartIncluding": "2.6.37",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.85",
"versionStartIncluding": "2.6.37",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.8",
"versionStartIncluding": "2.6.37",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.16",
"versionStartIncluding": "2.6.37",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: pch_can: pch_can_rx_normal: fix use after free\n\nAfter calling netif_receive_skb(skb), dereferencing skb is unsafe.\nEspecially, the can_frame cf which aliases skb memory is dereferenced\njust after the call netif_receive_skb(skb).\n\nReordering the lines solves the issue."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The UAF is in the pch_can hardware RX path (PCI interrupt \u2192 NAPI \u2192 pch_can_rx_normal), triggered by Classical CAN frames arriving on the shared CAN bus; like Bluetooth/WiFi this is limited to the same physical bus segment, not Internet-routable.\nAC:L - Any received frame reliably hits the bug: can_receive() always consume_skb()s the original skb after delivery, so cf (aliasing skb data) is always dangling when cf-\u003elen is read; the attacker fully controls frame injection on the bus.\nPR:N - Exploitation requires only the ability to inject unauthenticated CAN frames onto the bus attached to the EG20T PCH controller; no local account or capability on the victim Linux system is needed.\nUI:N - No victim action is required beyond the CAN interface already being operational and receiving, which is the normal deployed state for this controller.\nS:U - Impact is confined to the local kernel\u0027s networking/stats path; there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - This is a use-after-free of skb/can_frame memory after netif_receive_skb; UAF of freed heap objects can be leveraged for information disclosure (including via the cf-\u003elen read into observable rx_bytes stats).\nI:H - Use-after-free of the skb backing store enables heap reuse/spray primitives that can be escalated to integrity compromise and control-flow hijacking under standard kernel UAF exploitation models.\nA:H - The deterministic UAF on every RX frame can cause kernel oops/panic (e.g. under KASAN or when the reclaimed page is unmapped), fully disrupting the system."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T08:48:14.519Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d"
},
{
"url": "https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76"
},
{
"url": "https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3"
},
{
"url": "https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa"
},
{
"url": "https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4"
},
{
"url": "https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e"
},
{
"url": "https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7"
},
{
"url": "https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db"
}
],
"title": "can: pch_can: pch_can_rx_normal: fix use after free",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47520",
"datePublished": "2024-05-24T15:09:33.796Z",
"dateReserved": "2024-05-24T15:02:54.824Z",
"dateUpdated": "2026-08-05T08:48:14.519Z",
"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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