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The Wire · Showcase

KERNEL RC5 CLOSES CRITICAL GAPS IN SMB, IO_URING, AND POWER MANAGEMENT

By RepoJournal · Filed · About Linux

Linus pulled three major subsystem fixes overnight that address use-after-free vulnerabilities, uninitialized data leaks to userspace, and frequency computation bugs that affect millions of Intel workstations.

The SMB client stack got its teeth back with a security hardening pass [1], plugging a missing lock condition and a dangerous dentry-after-unmount scenario that could leave dangling references. The io_uring team shipped critical fixes [2] for IORING_OP_WAITID, where uninitialized kernel state was bleeding into userspace, plus a lockdep violation that could deadlock under contention. Power management saw dual fixes [3] for intel_pstate's maximum frequency calculation on Raptor Lake-E and Bartlett Lake, a bug that silently underclocks entire processor families. The DRM subsystem pulled in the usual cleanup work [4] with amdgpu and xe getting their share of fixes, while the block layer plugged a use-after-free in zone resource teardown [5] that could corrupt the worker thread state on zoned devices. This RC5 closes the gap between the current code and production readiness, with no padding.

Action items

References

  1. [1] Merge tag 'v7.1-rc5-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6 torvalds/linux
  2. [2] Merge tag 'io_uring-7.1-20260522' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux torvalds/linux
  3. [3] Merge tag 'pm-7.1-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm torvalds/linux
  4. [4] Merge tag 'drm-fixes-2026-05-23' of https://gitlab.freedesktop.org/drm/kernel torvalds/linux
  5. [5] block: avoid use-after-free in disk_free_zone_resources() torvalds/linux

FAQ

What changed in Linux on May 23, 2026?
Linus pulled three major subsystem fixes overnight that address use-after-free vulnerabilities, uninitialized data leaks to userspace, and frequency computation bugs that affect millions of Intel workstations.
What should Linux teams do about it?
Rebuild with SMB client fixes before deploying any CIFS-dependent infrastructure • Test io_uring workloads with IORING_OP_WAITID under load to confirm lockdep fix • Verify intel_pstate frequency scaling on Raptor Lake-E if you're running that silicon
Which Linux repositories shipped on May 23, 2026?
torvalds/linux

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