liveupdate: validate session type before performing operation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68455
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:17:17 UTC
Updated2026-08-17 06:17:54 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.051860000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 16cec0d265219f14a7fcebcc43aeb69205adba56 3dc8a46d08a8a060d4128e9f497060b8d03c1595 git Not specified
CNA Linux Linux affected 16cec0d265219f14a7fcebcc43aeb69205adba56 507e3b479f9c6d85135eb5e1a77fb3fddb259ad8 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/507e3b479f9c6d85135eb5e1a77fb3fddb259ad8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3dc8a46d08a8a060d4128e9f497060b8d03c1595 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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