CVE-2026-89745 is a vulnerability in Linux Kernel
Published on September 11, 2026
debugfs: Fix lockdown check for mmap_prepare
In the Linux kernel, the following vulnerability has been resolved:
debugfs: Fix lockdown check for mmap_prepare
Commit 651fdda8406d ("relay: update relay to use mmap_prepare")
changed the `mmap` file operation to `mmap_prepare` for relayfs, but
the lockdown check in debugfs was not updated accordingly.
This prevents debugfs from being locked down when the kernel is in
integrity mode if a file uses `mmap_prepare` but not `mmap`.
Since the conversion to `mmap_prepare` across the kernel is not yet
complete, update the lockdown check to look for both `mmap` and
`mmap_prepare` to ensure comprehensive coverage.
Products Associated with CVE-2026-89745
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Affected Versions
Linux:- Version 651fdda8406d42a5004c5c79f269540a85d6a1ab and below e7f6a6b5741d16fdac7adaecbe0fa52ae756f208 is affected.
- Version 651fdda8406d42a5004c5c79f269540a85d6a1ab and below f81808de37338aac8e167f99bfae647b1b835c70 is affected.
- Version 6.19 is affected.
- Before 6.19 is unaffected.
- Version 7.2.4, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.