In the Linux kernel, the following vulnerability has been resolved:
x86/bugs: Make Safe-RET robust against interrupt injection
An attacker injecting interrupts while the Safe-RET mitigation executes
on machines affected by SRSO can neutralize the safe return sequence,
potentially leading to data leakage through speculative execution.
Fixup register state as if the Safe-RET sequence executed successfully
by "emulating" it, in a manner of speaking, and avoid executing a RET
instruction after returning from the interrupt.
References 6
https://git.kernel.org/stable/c/608c8f5dccaaf8b8d2b28c0fbdd439d144be62b0
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/61649a2d61cb0dbc673f0f232f0f0c298bf50442
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/95b08cdd603fe79d2e9d5212fbb13d577c835f4f
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/9c0b8105e919be5208c81d5516a194a28c58fe1e
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/9de1a49e8f1fbf7c372902573a27a97d4ab4d0af
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/bfe7f9993467ba431b2731437949ac1e2634e771
416baaa9-dc9f-4396-8d5f-8c081fb06d67