# CVE-2026-64279: i2c: core: fix adapter deregistration race

Status: published. Published: 2026-07-25. Updated: 2026-11-10.

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

i2c: core: fix adapter deregistration race

Adapters can be looked up by their id using i2c_get_adapter() which
takes a reference to the embedded struct device.

Remove the adapter from the IDR before tearing it down during
deregistration (and on registration failure) to make sure its resources
are not accessed after having been freed (e.g. the device name).

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 35fc37f8188177e3ba3e7f99a6e3300e490e9181; < d39282f552dd6c35b9b84b4af78f1198c24f3373 (affected, git); ≥ 35fc37f8188177e3ba3e7f99a6e3300e490e9181; < 11dfa37bf544cc806f21742ca2fd2d841bd7032e (affected, git); ≥ 35fc37f8188177e3ba3e7f99a6e3300e490e9181; < 9882a9bd74db08e7bae5821a7050627ae92d3380 (affected, git); ≥ 35fc37f8188177e3ba3e7f99a6e3300e490e9181; < bb234487a447a99315add1b46aa57b72e163e1eb (affected, git); ≥ 35fc37f8188177e3ba3e7f99a6e3300e490e9181; < b6d2af6fe9c1f5ec0484536753c979cbd40a8ac3 (affected, git); ≥ 35fc37f8188177e3ba3e7f99a6e3300e490e9181; < 35dbd1f1f603401155cbd3a180bb18e3a3b675b8 (affected, git); ≥ 35fc37f8188177e3ba3e7f99a6e3300e490e9181; < b1a58ed9eab146b36f41a55db8f5d7ce9fdedf3f (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.31 (affected); ≥ 0; < 2.6.31 (unaffected, semver); ≥ 5.15.212; ≤ 5.15.* (unaffected, semver); ≥ 6.1.178; ≤ 6.1.* (unaffected, semver); ≥ 6.6.145; ≤ 6.6.* (unaffected, semver); ≥ 6.12.96; ≤ 6.12.* (unaffected, semver); ≥ 6.18.39; ≤ 6.18.* (unaffected, semver); ≥ 7.1.4; ≤ 7.1.* (unaffected, semver); ≥ 7.2; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: Linux

- CISA KEV: No listing in collected sources

- EPSS: 0.13% as of 2026-11-09; percentile 2.85%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-362

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/d39282f552dd6c35b9b84b4af78f1198c24f3373 (CNA: Linux)

- https://git.kernel.org/stable/c/11dfa37bf544cc806f21742ca2fd2d841bd7032e (CNA: Linux)

- https://git.kernel.org/stable/c/9882a9bd74db08e7bae5821a7050627ae92d3380 (CNA: Linux)

- https://git.kernel.org/stable/c/bb234487a447a99315add1b46aa57b72e163e1eb (CNA: Linux)

- https://git.kernel.org/stable/c/b6d2af6fe9c1f5ec0484536753c979cbd40a8ac3 (CNA: Linux)

- https://git.kernel.org/stable/c/35dbd1f1f603401155cbd3a180bb18e3a3b675b8 (CNA: Linux)

- https://git.kernel.org/stable/c/b1a58ed9eab146b36f41a55db8f5d7ce9fdedf3f (CNA: Linux)

- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (ADP: siemens-SADP)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-64279; retrieved 2026-11-10; source updated 2026-11-10

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-64279; retrieved 2026-11-10; source updated Not reported

Revision: 79fa35658b5d2fd4f954aa1ee07d4064124992b7fe6f15407cf663f2803d5816

Canonical: https://y2.dev/cve/CVE-2026-64279

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