CVE-2026-31567

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> PM: sleep: Drop spurious WARN_ON() from pm_restore_gfp_mask()<br /> <br /> Commit 35e4a69b2003f ("PM: sleep: Allow pm_restrict_gfp_mask()<br /> stacking") introduced refcount-based GFP mask management that warns<br /> when pm_restore_gfp_mask() is called with saved_gfp_count == 0.<br /> <br /> Some hibernation paths call pm_restore_gfp_mask() defensively where<br /> the GFP mask may or may not be restricted depending on the execution<br /> path. For example, the uswsusp interface invokes it in<br /> SNAPSHOT_CREATE_IMAGE, SNAPSHOT_UNFREEZE, and snapshot_release().<br /> Before the stacking change this was a silent no-op; it now triggers<br /> a spurious WARNING.<br /> <br /> Remove the WARN_ON() wrapper from the !saved_gfp_count check while<br /> retaining the check itself, so that defensive calls remain harmless<br /> without producing false warnings.<br /> <br /> [ rjw: Subject tweak ]