Vulnerability-Lookup

CVE-2026-74463 (GCVE-0-2026-74463)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37

Title

i2c: jz4780: Cache host clock rate at probe to prevent CCF prepare_lock deadlock

Summary

In the Linux kernel, the following vulnerability has been resolved: i2c: jz4780: Cache host clock rate at probe to prevent CCF prepare_lock deadlock Fix a severe AB/BA deadlock between the Common Clock Framework (CCF) and the I2C adapter lock, which triggers when an I2C-controlled clock generator client (like the Si5351) is registered or modified under the CCF. During an i2c client clock (generator) frequency change, the CCF acquires its global 'prepare_lock' mutex and the driver calls i2c_transfer() to update the client's chip registers, stalling for the adapter's I2C bus lock. Concurrently, an independent, parallel transfer on the same bus (e.g., a GPIO expander handling LEDs) can hold the I2C adapter lock. Inside this parallel transfer path, jz4780_i2c_set_speed() calls clk_get_rate() on the host controller's input clock to calculate bus timings. This call attempts to acquire the blocked CCF 'prepare_lock', creating a circular dependency that freezes the system. The jz4780 host controller clock itself is static and never changes at runtime. However, calling clk_get_rate() inside the active transfer path introduces an unnecessary dependency on the CCF internal locks. Eliminate this synchronous clk_get_rate() call from the active transfer path by caching the static host peripheral clock rate once - inside the private jz4780_i2c structure during jz4780_i2c_probe(). Update jz4780_i2c_set_speed() to use this cached value, safely decoupling active I2C transactions from the CCF internal locks without any risk of stale timings. Assisted-by web based Google AI (pinpointing the bug and writing the message).

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7018 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/cc111696ef420f6bb…
https://git.kernel.org/stable/c/f96a719d9f8a79710…
https://git.kernel.org/stable/c/deffad5bb4f8b4f09…
https://git.kernel.org/stable/c/14429dc1c756c35e1…
https://git.kernel.org/stable/c/b6cb47e186abba85a…
https://git.kernel.org/stable/c/19b783335d62e7a23…
https://git.kernel.org/stable/c/aa1944b52d6492c48…
https://git.kernel.org/stable/c/d99607c888f26e8a4…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: ba92222ed63a12d09120df9b92f56cc990abac19 , < cc111696ef420f6bb552b2526530067977f0b406 (git) Affected: ba92222ed63a12d09120df9b92f56cc990abac19 , < f96a719d9f8a797105ec5cacf568ab128e33391f (git) Affected: ba92222ed63a12d09120df9b92f56cc990abac19 , < deffad5bb4f8b4f09e46252f24754ddc9960b244 (git) Affected: ba92222ed63a12d09120df9b92f56cc990abac19 , < 14429dc1c756c35e106f01ff09cadccb82f5531d (git) Affected: ba92222ed63a12d09120df9b92f56cc990abac19 , < b6cb47e186abba85a3b08aa3023067ab82577286 (git) Affected: ba92222ed63a12d09120df9b92f56cc990abac19 , < 19b783335d62e7a2367436a6e1f1b37da1878360 (git) Affected: ba92222ed63a12d09120df9b92f56cc990abac19 , < aa1944b52d6492c48bdd17046578aa0d953546e6 (git) Affected: ba92222ed63a12d09120df9b92f56cc990abac19 , < d99607c888f26e8a4e9fe9772860cef4aff86bb4 (git)	guessed
Linux	Linux	Affected: 4.1 Unaffected: 0 , < 4.1 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (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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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: jz4780: Cache host clock rate at probe to prevent CCF prepare_lock deadlock\n\nFix a severe AB/BA deadlock between the Common Clock Framework (CCF)\nand the I2C adapter lock, which triggers when an I2C-controlled clock\ngenerator client (like the Si5351) is registered or modified under the CCF.\n\nDuring an i2c client clock (generator) frequency change, the CCF acquires its global\n\u0027prepare_lock\u0027 mutex and the driver calls i2c_transfer() to update the client\u0027s\nchip registers, stalling for the adapter\u0027s I2C bus lock.\n\nConcurrently, an independent, parallel transfer on the same bus (e.g., a GPIO\nexpander handling LEDs) can hold the I2C adapter lock. Inside this parallel\ntransfer path, jz4780_i2c_set_speed() calls clk_get_rate() on the host\ncontroller\u0027s input clock to calculate bus timings. This call attempts to acquire\nthe blocked CCF \u0027prepare_lock\u0027, creating a circular dependency that freezes\nthe system.\n\nThe jz4780 host controller clock itself is static and never changes at runtime.\n\nHowever, calling clk_get_rate() inside the active transfer path introduces\nan unnecessary dependency on the CCF internal locks.\n\nEliminate this synchronous clk_get_rate() call from the active transfer\npath by caching the static host peripheral clock rate once - inside the private\njz4780_i2c structure during jz4780_i2c_probe(). Update jz4780_i2c_set_speed()\nto use this cached value, safely decoupling active I2C transactions from the\nCCF internal locks without any risk of stale timings.\n\nAssisted-by web based Google AI (pinpointing the bug and writing the message)."
        }
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    "dateReserved": "2026-08-15T05:44:03.901Z",
    "dateUpdated": "2026-08-19T16:37:02.602Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: jz4780: Cache host clock rate at probe to prevent CCF prepare_lock deadlock\n\nFix a severe AB/BA deadlock between the Common Clock Framework (CCF)\nand the I2C adapter lock, which triggers when an I2C-controlled clock\ngenerator client (like the Si5351) is registered or modified under the CCF.\n\nDuring an i2c client clock (generator) frequency change, the CCF acquires its global\n\u0027prepare_lock\u0027 mutex and the driver calls i2c_transfer() to update the client\u0027s\nchip registers, stalling for the adapter\u0027s I2C bus lock.\n\nConcurrently, an independent, parallel transfer on the same bus (e.g., a GPIO\nexpander handling LEDs) can hold the I2C adapter lock. Inside this parallel\ntransfer path, jz4780_i2c_set_speed() calls clk_get_rate() on the host\ncontroller\u0027s input clock to calculate bus timings. This call attempts to acquire\nthe blocked CCF \u0027prepare_lock\u0027, creating a circular dependency that freezes\nthe system.\n\nThe jz4780 host controller clock itself is static and never changes at runtime.\n\nHowever, calling clk_get_rate() inside the active transfer path introduces\nan unnecessary dependency on the CCF internal locks.\n\nEliminate this synchronous clk_get_rate() call from the active transfer\npath by caching the static host peripheral clock rate once - inside the private\njz4780_i2c structure during jz4780_i2c_probe(). Update jz4780_i2c_set_speed()\nto use this cached value, safely decoupling active I2C transactions from the\nCCF internal locks without any risk of stale timings.\n\nAssisted-by web based Google AI (pinpointing the bug and writing the message)."
          }
        ],
        "id": "CVE-2026-74463",
        "lastModified": "2026-08-19T17:21:03.237",
        "metrics": {},
        "published": "2026-08-15T13:17:50.963",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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      "current_release_date": "2026-10-17T21:23:53+00:00",
      "cve": "CVE-2026-74463",
      "id": "CVE-2026-74463",
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      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: i2c: jz4780: Cache host clock rate at probe to prevent CCF prepare_lock deadlock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74463.json",
      "version": "3"
    }
  }
}

WID-SEC-W-2026-2852

Vulnerability from csaf_certbund - Published: 2026-08-16 22:00 - Updated: 2026-08-31 22:00

Summary

Linux Kernel: Mehrere Schwachstellen

Severity

Hoch

Scope

850 vulnerabilities in this advisory, including CVE-2026-74463.

CVE-2026-74463

Known affected: 4 products

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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.

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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