CVE-2026-45865
In the Linux kernel, the following vulnerability has been resolved: mctp i2c: initialise event handler read bytes Set a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads will return "val" from the i2c bus driver. For i2c-aspeed and i2c-npcm7xx that is a stack uninitialised u8. Tested with "i2ctransfer -y 1 r10@0x34" where 0x34 is a mctp-i2c instance, now it returns all 0xff.
Affected versions
Linux kernel versions
5.18
and later are affected. Fixed in
6.1.165,
6.6.128,
6.12.75,
6.18.14,
6.19.4,
7.0
and their respective stable series.
References
The following references provide additional information about CVE-2026-45865 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01
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PatchKernel patch commithttps://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f
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PatchKernel patch commithttps://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d
Frequently asked questions
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What is CVE-2026-45865?
CVE-2026-45865 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.18 onward and has been patched in 6.1.165, 6.6.128, 6.12.75 and others. CVE-2026-45865 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-45865?
Yes — CVE-2026-45865 has been patched. Fixed versions include 6.1.165, 6.6.128, 6.12.75 and others. If you are running Linux kernel 5.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-45865 actively exploited?
No — CVE-2026-45865 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.