Public bug reported:
SRU Justification
[ Impact ]
Fixing CVE-2025-39993 requires a new structure refcount_t, introduced by
a series of commits in 2017
5d6dec6fba38 Kees Cook Sat Jul 1 11:01:29 2017 -0700
locking/refcount: Remove the half-implemented refcount_sub() API
fd25d19f6b8d Kees Cook Wed Jun 21 13:00:26 2017 -0700
locking/refcount: Create unchecked atomic_t implementation
d557d1b58b35 Greg Kroah-Hartman Thu May 4 15:51:03 2017 -0700
refcount: change EXPORT_SYMBOL markings
NOT INCLUDED b78c0d471255 Peter Zijlstra Wed Feb 1 16:07:55 2017 +0100
locking/refcounts: Use atomic_try_cmpxchg()
bd174169c7a1 David Windsor Fri Mar 10 10:34:12 2017 -0500
locking/refcount: Add refcount_t API kernel-doc comments
NOT INCLUDED 44fe84459faf1 (Peter Zijlstra 2017-03-27 13:54:38 +0200)
9dcfe2c75b51 Ingo Molnar Wed Mar 1 09:25:55 2017 +0100
locking/refcounts: Change WARN() to WARN_ONCE()
318b1dedcd39 Elena Reshetova Thu Feb 23 15:09:34 2017 +0200
locking/refcounts: Add missing kernel.h header to have UINT_MAX defined
29dee3c03abc Peter Zijlstra Fri Feb 10 16:27:52 2017 +0100
locking/refcounts: Out-of-line everything
NOT INCLUDED a9ebf306f52c7 (Peter Zijlstra 2017-02-01 16:39:38 +0100)
f405df5de317 Peter Zijlstra Mon Nov 14 18:06:19 2016 +0100 refcount_t:
Introduce a special purpose refcount type
By importing the listed commits, the new config option
CONFIG_REFCOUNT_FULL is added and it needs to be taken care of.
[ Fix ]
Enable the option in the kernel config
Following what has been done in Bionic, by default the option is set to N, but
on arm64 will be set as Y.
[ Test Case ]
Compile and boot tested.
[ Regression potential ]
The new header, config and library is self contained and used only by the
drivers/media/rc/imon.c, the only one including the header itself.
There could be regressions in the use of the SoundGraph iMON MultiMedia
IR/Display in case the new refcount_t library contains flaws.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2131205
Title:
Xenial: CVE-2025-39993 - Add new CONFIG_REFCOUNT_FULL config option
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