High 7.8Published Jul 19, 2026

CVE-2026-53400i2c: core: fix adapter registration race

Updated under an hour ago (Oct 27, 2026, 4:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: i2c: core: fix adapter registration race Adapters can be looked up based on their id using i2c_get_adapter() which takes a reference to the embedded struct device. Make sure that the adapter (including its struct device) has been initialised before adding it to the IDR to avoid accessing uninitialised data which could, for example, lead to NULL-pointer dereferences or use-after-free. Note that the i2c-dev chardev, which is registered from a bus notifier, currently uses i2c_get_adapter() so the adapter needs to be added to the IDR before registration.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-362
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	6e13e641841833cc2aa5baefe89bb04bc388801b builds before 2e57c788e71f1763445f812eba4e0b4a2fbd0646; from 6e13e641841833cc2aa5baefe89bb04bc388801b before a4365bc41baaf67f3a5aa8556d23544e6ec7480a; 6e13e641841833cc2aa5baefe89bb04bc388801b builds before 1febb174815bcae56d73587e99e8f87e02f0784d; from 6e13e641841833cc2aa5baefe89bb04bc388801b before da9d8d9711f78deebc202d0cffcf577e45ee8621; from 6e13e641841833cc2aa5baefe89bb04bc388801b before 78793c75dc6d0ff2e4d50ad617349b328a99054e; 6e13e641841833cc2aa5baefe89bb04bc388801b builds before 6a946038f2a5a8c29048c6af369d4e391448a5c5; from 6e13e641841833cc2aa5baefe89bb04bc388801b before a4c8094bbf4c6fa68b17e3b16f6a0a1b7a14f3e0; from 6e13e641841833cc2aa5baefe89bb04bc388801b before ba14d7cf2fe7284610a29854bdff22b2537d3ce6	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.22 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.95; from 6.13 before 6.18.38; from 6.19 before 7.1.3	NVD

References

References

https://git.kernel.org/stable/c/2e57c788e71f1763445f812eba4e0b4a2fbd0646	patch
https://git.kernel.org/stable/c/a4365bc41baaf67f3a5aa8556d23544e6ec7480a	patch
https://git.kernel.org/stable/c/1febb174815bcae56d73587e99e8f87e02f0784d	patch
https://git.kernel.org/stable/c/da9d8d9711f78deebc202d0cffcf577e45ee8621	patch
https://git.kernel.org/stable/c/78793c75dc6d0ff2e4d50ad617349b328a99054e	patch
https://git.kernel.org/stable/c/6a946038f2a5a8c29048c6af369d4e391448a5c5	patch
https://git.kernel.org/stable/c/a4c8094bbf4c6fa68b17e3b16f6a0a1b7a14f3e0	patch
https://git.kernel.org/stable/c/ba14d7cf2fe7284610a29854bdff22b2537d3ce6	patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.