CVE-2026-68455
Low risk· EPSS 5%Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel liveupdate (luo) mechanism, there is a lack of session type validation before performing ioctl operations. Some operations, such as PRESERVE_FD, are only applicable to outgoing sessions, while RETRIEVE_FD and FINISH are only valid for incoming sessions. Calling an invalid ioctl on a session can cause handlers to run in an unexpected context, leading to errors and WARN() warnings. The fix adds session type validation before dispatching the ioctl handler.
Risk Assessment
The vulnerability could lead to system malfunction, kernel warnings, and in extreme cases, system crashes or data integrity issues.
Recommendation
It is recommended to update the Linux kernel to a version containing the fix that adds session type validation in luo_session_ioctl().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: liveupdate: validate session type before performing operation The sessions ioctls are not applicable to all session types. PRESERVE_FD is only applicable to outgoing sessions. RETRIEVE_FD and FINISH are only valid for incoming session. Calling a incoming ioctl on an outgoing session is invalid and can cause file handlers to run into unexpected errors. For example, a user can create a (outgoing) session, preserve a memfd, and then immediately do a retrieve without doing a kexec in between. This would result in memfd's retrieve handler to run. The handlers expects to be called from a post-kexec context, and will try to do a kho_restore_vmalloc() or kho_restore_folio() to try and restore memory. KHO catches this (thanks to KHO_PAGE_MAGIC) and returns an error, but since this is considered an internal error and KHO throws out a bunch of WARN()s. Associate a type with each ioctl op and validate the type in luo_session_ioctl() before dispatching the ioctl handler to make sure the op is being called for the right session type.