7.8
CWE
787
Advisory Published
CVE Published
Updated

CVE-2024-38667: riscv: prevent pt_regs corruption for secondary idle threads

First published: Mon Jun 24 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: riscv: prevent pt_regs corruption for secondary idle threads Top of the kernel thread stack should be reserved for pt_regs. However this is not the case for the idle threads of the secondary boot harts. Their stacks overlap with their pt_regs, so both may get corrupted. Similar issue has been fixed for the primary hart, see c7cdd96eca28 ("riscv: prevent stack corruption by reserving task_pt_regs(p) early"). However that fix was not propagated to the secondary harts. The problem has been noticed in some CPU hotplug tests with V enabled. The function smp_callin stored several registers on stack, corrupting top of pt_regs structure including status field. As a result, kernel attempted to save or restore inexistent V context.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<5.7
Linux Linux kernel>=6.1<6.1.93
Linux Linux kernel>=6.6<6.6.33
Linux Linux kernel>=6.9<6.9.4
Linux Linux kernel=6.10.0-rc1
debian/linux<=5.10.223-1<=5.10.226-1
6.1.106-3
6.1.112-1
6.11.5-1
6.11.6-1

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