CVE-2026-74461 (GCVE-0-2026-74461)
Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-10-16 19:05
VLAI
EPSS
VEX
Title
i2c: imx: Cancel hrtimer before clearing slave pointer
Summary
In the Linux kernel, the following vulnerability has been resolved:
i2c: imx: Cancel hrtimer before clearing slave pointer
In i2c_imx_unreg_slave(), the slave pointer is set to NULL after
disabling interrupts. However, a pending interrupt might already
have started the hrtimer (i2c_imx_slave_timeout) before the pointer
was cleared. If the hrtimer fires after i2c_imx->slave is set to
NULL, the timer callback i2c_imx_slave_finish_op() will call
i2c_imx_slave_event() with a NULL slave pointer, which results in a
use-after-free / NULL pointer dereference.
Fix by canceling the hrtimer and waiting for it to complete after
disabling interrupts, before clearing the slave pointer.
Severity
8.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 18:57 UTC
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < e3da77bdb4015051656bb472c295656bbea03b6f
(git)
Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < 470fe15fb3bb2eba6629be301ca7e991ee3cfb7e (git) Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < a8a1f9ac3d763e721586f15479ef9140b216ddf3 (git) Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < 753060f2b77ff2f386addbd3ecadb95b9f90cddd (git) Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < affd62f5719a78135b7441aa49c8cab3c3b5e838 (git) Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < dab4762ee7f3fd0a01980d5407ba48d0261d3bff (git) Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < 6ac7702b6cc2b94aaed9ef2d95bfbefcdc90061f (git) |
guessed | |
| Linux | Linux |
Affected:
5.11
Unaffected: 0 , < 5.11 (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"version": "f7414cd6923fd7f78e57086fc964ba2dc25db5c1",
"versionType": "git"
},
{
"lessThan": "470fe15fb3bb2eba6629be301ca7e991ee3cfb7e",
"status": "affected",
"version": "f7414cd6923fd7f78e57086fc964ba2dc25db5c1",
"versionType": "git"
},
{
"lessThan": "a8a1f9ac3d763e721586f15479ef9140b216ddf3",
"status": "affected",
"version": "f7414cd6923fd7f78e57086fc964ba2dc25db5c1",
"versionType": "git"
},
{
"lessThan": "753060f2b77ff2f386addbd3ecadb95b9f90cddd",
"status": "affected",
"version": "f7414cd6923fd7f78e57086fc964ba2dc25db5c1",
"versionType": "git"
},
{
"lessThan": "affd62f5719a78135b7441aa49c8cab3c3b5e838",
"status": "affected",
"version": "f7414cd6923fd7f78e57086fc964ba2dc25db5c1",
"versionType": "git"
},
{
"lessThan": "dab4762ee7f3fd0a01980d5407ba48d0261d3bff",
"status": "affected",
"version": "f7414cd6923fd7f78e57086fc964ba2dc25db5c1",
"versionType": "git"
},
{
"lessThan": "6ac7702b6cc2b94aaed9ef2d95bfbefcdc90061f",
"status": "affected",
"version": "f7414cd6923fd7f78e57086fc964ba2dc25db5c1",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/i2c/busses/i2c-imx.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.11"
},
{
"lessThan": "5.11",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.151",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.103",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.44",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.8",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.11",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: imx: Cancel hrtimer before clearing slave pointer\n\nIn i2c_imx_unreg_slave(), the slave pointer is set to NULL after\ndisabling interrupts. However, a pending interrupt might already\nhave started the hrtimer (i2c_imx_slave_timeout) before the pointer\nwas cleared. If the hrtimer fires after i2c_imx-\u003eslave is set to\nNULL, the timer callback i2c_imx_slave_finish_op() will call\ni2c_imx_slave_event() with a NULL slave pointer, which results in a\nuse-after-free / NULL pointer dereference.\n\nFix by canceling the hrtimer and waiting for it to complete after\ndisabling interrupts, before clearing the slave pointer."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is in the imx I2C slave teardown path reached via i2c_slave_unregister during local driver removal on embedded i.MX systems; exploitation requires local proximity to trigger concurrent I2C bus activity on the same controller.\nAC:L - The attacker controls both sides of the race by generating I2C slave traffic to arm/restart the 30us hrtimer while unregister runs, and can retry rapidly across repeated teardown cycles until the window is hit.\nPR:N - No Linux credentials are required when an attacker with physical access to an exposed I2C bus races automated system maintenance (OTA, service restart, driver reload) that calls i2c_slave_unregister on imx slave backends.\nUI:N - Exploitation does not require victim interaction; automated firmware updates or service restarts that unregister the slave driver are sufficient to create the teardown side of the race.\nS:U - Impact is confined to kernel memory corruption and crash on the same host; this is not a VM escape, IOMMU bypass, or cross-security-authority boundary.\nC:H - The timer callback invokes i2c_slave_event with a NULL/freed slave pointer (use-after-free), a memory safety violation that can be leveraged for arbitrary kernel memory read primitives per CVSS UAF guidance.\nI:H - Use-after-free in the slave event callback path can enable heap manipulation and arbitrary kernel write or control-flow hijack, not merely a deterministic NULL dereference crash.\nA:H - Triggering i2c_slave_event with a NULL slave causes kernel oops/panic, and the original patch series notes the last_slave_event loop in i2c_imx_slave_finish_op can hang the system."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:37:00.344Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e3da77bdb4015051656bb472c295656bbea03b6f"
},
{
"url": "https://git.kernel.org/stable/c/470fe15fb3bb2eba6629be301ca7e991ee3cfb7e"
},
{
"url": "https://git.kernel.org/stable/c/a8a1f9ac3d763e721586f15479ef9140b216ddf3"
},
{
"url": "https://git.kernel.org/stable/c/753060f2b77ff2f386addbd3ecadb95b9f90cddd"
},
{
"url": "https://git.kernel.org/stable/c/affd62f5719a78135b7441aa49c8cab3c3b5e838"
},
{
"url": "https://git.kernel.org/stable/c/dab4762ee7f3fd0a01980d5407ba48d0261d3bff"
},
{
"url": "https://git.kernel.org/stable/c/6ac7702b6cc2b94aaed9ef2d95bfbefcdc90061f"
}
],
"title": "i2c: imx: Cancel hrtimer before clearing slave pointer",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74461",
"datePublished": "2026-08-15T12:27:01.924Z",
"dateReserved": "2026-08-15T05:44:03.901Z",
"dateUpdated": "2026-10-16T19:05:47.029Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.