CVE-2021-47153 (GCVE-0-2021-47153)
Vulnerability from cvelistv5 – Published: 2024-03-25 09:07 – Updated: 2026-08-05 08:46
VLAI
EPSS
VEX
Title
i2c: i801: Don't generate an interrupt on bus reset
Summary
In the Linux kernel, the following vulnerability has been resolved:
i2c: i801: Don't generate an interrupt on bus reset
Now that the i2c-i801 driver supports interrupts, setting the KILL bit
in a attempt to recover from a timed out transaction triggers an
interrupt. Unfortunately, the interrupt handler (i801_isr) is not
prepared for this situation and will try to process the interrupt as
if it was signaling the end of a successful transaction. In the case
of a block transaction, this can result in an out-of-range memory
access.
This condition was reproduced several times by syzbot:
https://syzkaller.appspot.com/bug?extid=ed71512d469895b5b34e
https://syzkaller.appspot.com/bug?extid=8c8dedc0ba9e03f6c79e
https://syzkaller.appspot.com/bug?extid=c8ff0b6d6c73d81b610e
https://syzkaller.appspot.com/bug?extid=33f6c360821c399d69eb
https://syzkaller.appspot.com/bug?extid=be15dc0b1933f04b043a
https://syzkaller.appspot.com/bug?extid=b4d3fd1dfd53e90afd79
So disable interrupts while trying to reset the bus. Interrupts will
be enabled again for the following transaction.
Severity
7.8 (High)
6 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-25 19:20 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
636752bcb5177a301d0266270661581de8624828 , < f9469082126cebb7337db3992d143f5e4edfe629
(git)
Affected: 636752bcb5177a301d0266270661581de8624828 , < 09c9e79f4c10cfb6b9e0e1b4dd355232e4b5a3b3 (git) Affected: 636752bcb5177a301d0266270661581de8624828 , < dfa8929e117b0228a7765f5c3f5988a4a028f3c6 (git) Affected: 636752bcb5177a301d0266270661581de8624828 , < c70e1ba2e7e65255a0ce004f531dd90dada97a8c (git) Affected: 636752bcb5177a301d0266270661581de8624828 , < 04cc05e3716ae31b17ecdab7bc55c8170def1b8b (git) Affected: 636752bcb5177a301d0266270661581de8624828 , < b523feb7e8e44652f92f3babb953a976e7ccbbef (git) Affected: 636752bcb5177a301d0266270661581de8624828 , < 1f583d3813f204449037cd2acbfc09168171362a (git) Affected: 636752bcb5177a301d0266270661581de8624828 , < e4d8716c3dcec47f1557024add24e1f3c09eb24b (git) |
guessed | |
| Linux | Linux |
Affected:
3.6
Unaffected: 0 , < 3.6 (semver) Unaffected: 4.4.271 , ≤ 4.4.* (semver) Unaffected: 4.9.271 , ≤ 4.9.* (semver) Unaffected: 4.14.235 , ≤ 4.14.* (semver) Unaffected: 4.19.193 , ≤ 4.19.* (semver) Unaffected: 5.4.124 , ≤ 5.4.* (semver) Unaffected: 5.10.42 , ≤ 5.10.* (semver) Unaffected: 5.12.9 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix) |
guessed |
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/i2c/busses/i2c-i801.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "f9469082126cebb7337db3992d143f5e4edfe629",
"status": "affected",
"version": "636752bcb5177a301d0266270661581de8624828",
"versionType": "git"
},
{
"lessThan": "09c9e79f4c10cfb6b9e0e1b4dd355232e4b5a3b3",
"status": "affected",
"version": "636752bcb5177a301d0266270661581de8624828",
"versionType": "git"
},
{
"lessThan": "dfa8929e117b0228a7765f5c3f5988a4a028f3c6",
"status": "affected",
"version": "636752bcb5177a301d0266270661581de8624828",
"versionType": "git"
},
{
"lessThan": "c70e1ba2e7e65255a0ce004f531dd90dada97a8c",
"status": "affected",
"version": "636752bcb5177a301d0266270661581de8624828",
"versionType": "git"
},
{
"lessThan": "04cc05e3716ae31b17ecdab7bc55c8170def1b8b",
"status": "affected",
"version": "636752bcb5177a301d0266270661581de8624828",
"versionType": "git"
},
{
"lessThan": "b523feb7e8e44652f92f3babb953a976e7ccbbef",
"status": "affected",
"version": "636752bcb5177a301d0266270661581de8624828",
"versionType": "git"
},
{
"lessThan": "1f583d3813f204449037cd2acbfc09168171362a",
"status": "affected",
"version": "636752bcb5177a301d0266270661581de8624828",
"versionType": "git"
},
{
"lessThan": "e4d8716c3dcec47f1557024add24e1f3c09eb24b",
"status": "affected",
"version": "636752bcb5177a301d0266270661581de8624828",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/i2c/busses/i2c-i801.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.6"
},
{
"lessThan": "3.6",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.271",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.271",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.235",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.193",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.124",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.13",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.4.271",
"versionStartIncluding": "3.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.9.271",
"versionStartIncluding": "3.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.14.235",
"versionStartIncluding": "3.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.19.193",
"versionStartIncluding": "3.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.124",
"versionStartIncluding": "3.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.42",
"versionStartIncluding": "3.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.12.9",
"versionStartIncluding": "3.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.13",
"versionStartIncluding": "3.6",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: i801: Don\u0027t generate an interrupt on bus reset\n\nNow that the i2c-i801 driver supports interrupts, setting the KILL bit\nin a attempt to recover from a timed out transaction triggers an\ninterrupt. Unfortunately, the interrupt handler (i801_isr) is not\nprepared for this situation and will try to process the interrupt as\nif it was signaling the end of a successful transaction. In the case\nof a block transaction, this can result in an out-of-range memory\naccess.\n\nThis condition was reproduced several times by syzbot:\nhttps://syzkaller.appspot.com/bug?extid=ed71512d469895b5b34e\nhttps://syzkaller.appspot.com/bug?extid=8c8dedc0ba9e03f6c79e\nhttps://syzkaller.appspot.com/bug?extid=c8ff0b6d6c73d81b610e\nhttps://syzkaller.appspot.com/bug?extid=33f6c360821c399d69eb\nhttps://syzkaller.appspot.com/bug?extid=be15dc0b1933f04b043a\nhttps://syzkaller.appspot.com/bug?extid=b4d3fd1dfd53e90afd79\n\nSo disable interrupts while trying to reset the bus. Interrupts will\nbe enabled again for the following transaction."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable path is reached locally via /dev/i2c-* I2C_SMBUS ioctls into i801_access \u2192 i801_block_transaction_byte_by_byte \u2192 i801_check_post; it is not reachable from network packet processing or physical SMBus injection.\nAC:L - An attacker who can open the adapter can issue block SMBus transactions and force wait_event_timeout to expire (including via I2C_TIMEOUT), reliably hitting the KILL path that leaves INTREN set; syzbot reproduced this repeatedly with no attacker-uncontrollable race required.\nPR:L - i2cdev_open() performs no capability check\u2014access is only DAC on /dev/i2c-*. On realistic worst-case deployments (i2c group or similarly relaxed permissions on developer/embedded/x86 systems with Intel PCH SMBus), a non-root local user can reach the path.\nUI:N - The attacker opens the device and issues the ioctls themselves; no separate victim action is required.\nS:U - Impact is ordinary in-kernel stack/memory corruption within the host kernel authority, not a VM escape, IOMMU bypass, or other cross-boundary breakout.\nC:H - The ISR performs out-of-range accesses on the block buffer (KASAN OOB reads) and related crashes show use-after-free of that buffer; this class of memory corruption is scored as enabling high confidentiality impact under the higher-severity rule.\nI:H - Syzbot also hit out-of-bounds/use-after-free writes in i801_isr_byte_done for the same root cause (KILL-generated interrupt while INTREN remains set), giving stack/heap corruption exploitable for control-flow hijacking.\nA:H - The memory-safety failure reliably produces kernel oops/KASAN reports and can panic the system, which is Availability High under kernel CVSS guidance."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T08:46:21.812Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f9469082126cebb7337db3992d143f5e4edfe629"
},
{
"url": "https://git.kernel.org/stable/c/09c9e79f4c10cfb6b9e0e1b4dd355232e4b5a3b3"
},
{
"url": "https://git.kernel.org/stable/c/dfa8929e117b0228a7765f5c3f5988a4a028f3c6"
},
{
"url": "https://git.kernel.org/stable/c/c70e1ba2e7e65255a0ce004f531dd90dada97a8c"
},
{
"url": "https://git.kernel.org/stable/c/04cc05e3716ae31b17ecdab7bc55c8170def1b8b"
},
{
"url": "https://git.kernel.org/stable/c/b523feb7e8e44652f92f3babb953a976e7ccbbef"
},
{
"url": "https://git.kernel.org/stable/c/1f583d3813f204449037cd2acbfc09168171362a"
},
{
"url": "https://git.kernel.org/stable/c/e4d8716c3dcec47f1557024add24e1f3c09eb24b"
}
],
"title": "i2c: i801: Don\u0027t generate an interrupt on bus reset",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47153",
"datePublished": "2024-03-25T09:07:47.873Z",
"dateReserved": "2024-03-04T18:12:48.846Z",
"dateUpdated": "2026-08-05T08:46:21.812Z",
"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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