Riskcovery

CVE-2024-38667

riscv: prevent pt_regs corruption for secondary idle threads

State
Published
Severity
Not scored
Published
Jun 24, 2024
Updated
May 11, 2026
Reserved
Jun 21, 2024

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 2875fe0561569f82d0e63658ccf0d11ce7da8922 to before ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9eAffected
  • 2875fe0561569f82d0e63658ccf0d11ce7da8922 to before 3090c06d50eaa91317f84bf3eac4c265e6cb8d44Affected
  • 2875fe0561569f82d0e63658ccf0d11ce7da8922 to before 0c1f28c32a194303da630fca89481334b9547b80Affected
  • 2875fe0561569f82d0e63658ccf0d11ce7da8922 to before a638b0461b58aa3205cd9d5f14d6f703d795b4afAffected
LinuxLinux
  • 5.7Affected
  • before 5.7Not affected
  • 6.1.93 through 6.1.*Not affected
  • 6.6.33 through 6.6.*Not affected
  • 6.9.4 through 6.9.*Not affected
  • 6.10 and laterNot affected

References

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