Vulnerability-Lookup

CVE-2026-64205 (GCVE-0-2026-64205)

Vulnerability from cvelistv5 – Published: 2026-07-20 16:27 – Updated: 2026-08-17 04:51

Title

i2c: i801: fix hardware state machine corruption in error path

Summary

In the Linux kernel, the following vulnerability has been resolved: i2c: i801: fix hardware state machine corruption in error path A severe livelock and subsequent Hung Task panic were observed in the i2c-i801 driver during concurrent Fuzzing. The crash is caused by an unconditional hardware register cleanup in the error handling path of i801_access(). When i801_check_pre() fails (e.g., returning -EBUSY because the SMBus controller is actively used by BIOS/ACPI), the kernel does not actually acquire the hardware ownership. However, the code jumps to the 'out' label and executes: iowrite8(SMBHSTSTS_INUSE_STS | STATUS_FLAGS, SMBHSTSTS(priv)); This forcefully clears the INUSE_STS lock and resets the hardware status flags without owning the controller. Doing so interrupts ongoing BIOS/ACPI transactions and totally corrupts the SMBus hardware state machine. Consequently, all subsequent i801_access() calls fail at the pre-check stage, triggering an endless stream of "SMBus is busy, can't use it!" error logs. Over a slow serial console, this printk flood monopolizes the CPU (Console Livelock), starving other processes trying to acquire the mmap_lock down_read semaphore, ultimately triggering the hung task watchdog. Fix this by moving the 'out' label below the hardware register cleanup. If i801_check_pre() fails, we safely bypass the iowrite8() and only release the software locks (pm_runtime and mutex), strictly adhering to the rule of not releasing resources that were never acquired.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6843 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/2ef69871b313aa0f0…
https://git.kernel.org/stable/c/ef5a347532932f587…
https://git.kernel.org/stable/c/bb5133a7d5f3fe5c3…
https://git.kernel.org/stable/c/00904687b9c5527d5…
https://git.kernel.org/stable/c/10dd1a736d557e310…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 1f760b87e54cf56a25ab68f8dc625e339f6e46d5 , < 2ef69871b313aa0f02182795f5e0f5aa455f203c (git) Affected: 1f760b87e54cf56a25ab68f8dc625e339f6e46d5 , < ef5a347532932f58748dad485c15039f5168c377 (git) Affected: 1f760b87e54cf56a25ab68f8dc625e339f6e46d5 , < bb5133a7d5f3fe5c387770e25f2e00e682ce11ed (git) Affected: 1f760b87e54cf56a25ab68f8dc625e339f6e46d5 , < 00904687b9c5527d569d9a1ca72119823e735a61 (git) Affected: 1f760b87e54cf56a25ab68f8dc625e339f6e46d5 , < 10dd1a736d557e310a77117832874729a0175d57 (git)	guessed
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

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GHSA-CFCM-PXWX-HG62

Vulnerability from github – Published: 2026-07-20 18:32 – Updated: 2026-08-11 21:32

Details

In the Linux kernel, the following vulnerability has been resolved:

i2c: i801: fix hardware state machine corruption in error path

A severe livelock and subsequent Hung Task panic were observed in the i2c-i801 driver during concurrent Fuzzing. The crash is caused by an unconditional hardware register cleanup in the error handling path of i801_access().

When i801_check_pre() fails (e.g., returning -EBUSY because the SMBus controller is actively used by BIOS/ACPI), the kernel does not actually acquire the hardware ownership. However, the code jumps to the 'out' label and executes:

iowrite8(SMBHSTSTS_INUSE_STS | STATUS_FLAGS, SMBHSTSTS(priv));

This forcefully clears the INUSE_STS lock and resets the hardware status flags without owning the controller. Doing so interrupts ongoing BIOS/ACPI transactions and totally corrupts the SMBus hardware state machine.

Consequently, all subsequent i801_access() calls fail at the pre-check stage, triggering an endless stream of "SMBus is busy, can't use it!" error logs. Over a slow serial console, this printk flood monopolizes the CPU (Console Livelock), starving other processes trying to acquire the mmap_lock down_read semaphore, ultimately triggering the hung task watchdog.

Fix this by moving the 'out' label below the hardware register cleanup. If i801_check_pre() fails, we safely bypass the iowrite8() and only release the software locks (pm_runtime and mutex), strictly adhering to the rule of not releasing resources that were never acquired.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

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    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: i801: fix hardware state machine corruption in error path\n\nA severe livelock and subsequent Hung Task panic were observed in the\ni2c-i801 driver during concurrent Fuzzing. The crash is caused by an\nunconditional hardware register cleanup in the error handling path of\ni801_access().\n\nWhen i801_check_pre() fails (e.g., returning -EBUSY because the SMBus\ncontroller is actively used by BIOS/ACPI), the kernel does not actually\nacquire the hardware ownership. However, the code jumps to the \u0027out\u0027\nlabel and executes:\n\n    iowrite8(SMBHSTSTS_INUSE_STS | STATUS_FLAGS, SMBHSTSTS(priv));\n\nThis forcefully clears the INUSE_STS lock and resets the hardware status\nflags without owning the controller. Doing so interrupts ongoing BIOS/ACPI\ntransactions and totally corrupts the SMBus hardware state machine.\n\nConsequently, all subsequent i801_access() calls fail at the pre-check\nstage, triggering an endless stream of \"SMBus is busy, can\u0027t use it!\"\nerror logs. Over a slow serial console, this printk flood monopolizes\nthe CPU (Console Livelock), starving other processes trying to acquire\nthe mmap_lock down_read semaphore, ultimately triggering the hung task\nwatchdog.\n\nFix this by moving the \u0027out\u0027 label below the hardware register cleanup.\nIf i801_check_pre() fails, we safely bypass the iowrite8() and only\nrelease the software locks (pm_runtime and mutex), strictly adhering to\nthe rule of not releasing resources that were never acquired.",
  "id": "GHSA-cfcm-pxwx-hg62",
  "modified": "2026-08-11T21:32:25Z",
  "published": "2026-07-20T18:32:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64205"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/00904687b9c5527d569d9a1ca72119823e735a61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10dd1a736d557e310a77117832874729a0175d57"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ef69871b313aa0f02182795f5e0f5aa455f203c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb5133a7d5f3fe5c387770e25f2e00e682ce11ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef5a347532932f58748dad485c15039f5168c377"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-64205

Vulnerability from csaf_microsoft - Published: 2026-07-22 01:01 - Updated: 2026-07-22 01:01

Summary

i2c: i801: fix hardware state machine corruption in error path

Scope

1 vulnerability in this advisory, including CVE-2026-64205.

CVE-2026-64205

Known affected: 1 product

Open the full advisory

OPENSUSE-SU-2026:11476-1

Vulnerability from csaf_opensuse - Published: 2026-08-09 00:00 - Updated: 2026-09-26 08:35

Summary

kernel-devel-7.1.7-1.1 on GA media

Severity

Moderate

Scope

351 vulnerabilities in this advisory, including CVE-2026-64205.

CVE-2026-64205

4.1 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Recommended: 16 products

Open the full advisory

OPENSUSE-SU-2026:22091-1

Vulnerability from csaf_opensuse - Published: 2026-10-12 15:44 - Updated: 2026-10-19 17:25

Summary

Security update for the Linux Kernel

Severity

Important

Scope

401 vulnerabilities in this advisory, including CVE-2026-64205.

CVE-2026-64205

4.1 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Recommended: 136 products

Open the full advisory

SUSE-SU-2026:24179-1

Vulnerability from csaf_suse - Published: 2026-10-12 13:24 - Updated: 2026-10-20 09:49

Summary

Security update for the Linux Kernel

Severity

Important

Scope

401 vulnerabilities in this advisory, including CVE-2026-64205.

CVE-2026-64205

4.1 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Recommended: 8 products

Open the full advisory

SUSE-SU-2026:24181-1

Vulnerability from csaf_suse - Published: 2026-10-12 15:51 - Updated: 2026-10-20 09:49

Summary

Security update for the Linux Kernel

Severity

Important

Scope

473 vulnerabilities in this advisory, including CVE-2026-64205.

CVE-2026-64205

4.1 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Recommended: 17 products

Open the full advisory

SUSE-SU-2026:24182-1

Vulnerability from csaf_suse - Published: 2026-10-12 14:42 - Updated: 2026-10-20 09:49

Summary

Security update for the Linux Kernel

Severity

Important

Scope

479 vulnerabilities in this advisory, including CVE-2026-64205.

CVE-2026-64205

4.1 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Recommended: 20 products

Open the full advisory

SUSE-SU-2026:24184-1

Vulnerability from csaf_suse - Published: 2026-10-12 13:51 - Updated: 2026-10-20 09:49

Summary

Security update for the Linux Kernel

Severity

Important

Scope

401 vulnerabilities in this advisory, including CVE-2026-64205.

CVE-2026-64205

4.1 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Recommended: 28 products

Open the full advisory

SUSE-SU-2026:24197-1

Vulnerability from csaf_suse - Published: 2026-10-12 14:15 - Updated: 2026-10-21 11:49

Summary

Security update for the Linux Kernel

Severity

Important

Scope

401 vulnerabilities in this advisory, including CVE-2026-64205.

CVE-2026-64205

4.1 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Recommended: 9 products

Open the full advisory

SUSE-SU-2026:24235-1

Vulnerability from csaf_suse - Published: 2026-10-12 13:51 - Updated: 2026-10-21 11:50

Summary

Security update for the Linux Kernel

Severity

Important

Scope

401 vulnerabilities in this advisory, including CVE-2026-64205.

CVE-2026-64205

4.1 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Recommended: 114 products

Open the full advisory

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.
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CVE-2026-64205 (GCVE-0-2026-64205)

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