Riskcovery

CVE-2026-31567

PM: sleep: Drop spurious WARN_ON() from pm_restore_gfp_mask()

State
Published
Severity
Not scored
Published
Apr 24, 2026
Updated
May 23, 2026
Reserved
Mar 9, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

PM: sleep: Drop spurious WARN_ON() from pm_restore_gfp_mask()

Commit 35e4a69b2003f ("PM: sleep: Allow pm_restrict_gfp_mask() stacking") introduced refcount-based GFP mask management that warns when pm_restore_gfp_mask() is called with saved_gfp_count == 0.

Some hibernation paths call pm_restore_gfp_mask() defensively where the GFP mask may or may not be restricted depending on the execution path. For example, the uswsusp interface invokes it in SNAPSHOT_CREATE_IMAGE, SNAPSHOT_UNFREEZE, and snapshot_release(). Before the stacking change this was a silent no-op; it now triggers a spurious WARNING.

Remove the WARN_ON() wrapper from the !saved_gfp_count check while retaining the check itself, so that defensive calls remain harmless without producing false warnings.

[ rjw: Subject tweak ]

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 35e4a69b2003f20a69e7d19ae96ab1eef1aa8e8d to before 3025ca5daa9d682b629c0c958b538e41deeb559dAffected
  • 35e4a69b2003f20a69e7d19ae96ab1eef1aa8e8d to before f19d1323aa3dd7ead469aef47d9085f8939565d9Affected
  • 35e4a69b2003f20a69e7d19ae96ab1eef1aa8e8d to before a8d51efb5929ae308895455a3e496b5eca2cd143Affected
  • 4ddf7293928cb619077724b7d828734da8181e6cAffected
  • 6.17.8 to before 6.18Affected
LinuxLinux
  • 6.18Affected
  • before 6.18Not affected
  • 6.18.21 through 6.18.*Not affected
  • 6.19.11 through 6.19.*Not affected
  • 7.0 and laterNot affected

References

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