CVE-2026-89903 LoongArch: Do not save/restore percpu base register in rethook trampoline

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Do not save/restore percpu base register in rethook trampoline The rethook trampoline saves $r21 $u0, the percpu base, into its frame at entry and restores it at exit. Inbetween rethooktrampolinehandler may schedule vi...

EUVD-2026-80503

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Do not save/restore percpu base register in rethook trampoline The rethook trampoline saves $r21 $u0, the percpu base, into its frame at entry and restores it at exit. Inbetween rethooktrampolinehandler may schedule vi...

CVE-2026-89903

CVE-2026-89903 affects the Linux kernel on the LoongArch architecture, specifically the rethook trampoline (previously the kretprobe trampoline since v6.3 ). The trampoline incorrectly saves and restores $r21 (the per-CPU base register) across its entry/exit frame. If a task migrates CPUs between...