Riskcovery

CVE-2023-53694

riscv: ftrace: Fixup panic by disabling preemption

State
Published
Severity
Not scored
Published
Oct 22, 2025
Updated
May 11, 2026
Reserved
Oct 22, 2025

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

riscv: ftrace: Fixup panic by disabling preemption

In RISCV, we must use an AUIPC + JALR pair to encode an immediate, forming a jump that jumps to an address over 4K. This may cause errors if we want to enable kernel preemption and remove dependency from patching code with stop_machine(). For example, if a task was switched out on auipc. And, if we changed the ftrace function before it was switched back, then it would jump to an address that has updated 11:0 bits mixing with previous XLEN:12 part.

p: patched area performed by dynamic ftrace ftrace_prologue: p| REG_S ra, -SZREG(sp) p| auipc ra, 0x? ------------> preempted ... change ftrace function ... p| jalr -?(ra) <------------- switched back p| REG_L ra, -SZREG(sp) func: xxx ret

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • afc76b8b80112189b6f11e67e19cf58301944814 to before 84cfcf240f4a577733b1d98fcd2611a611612b03Affected
  • afc76b8b80112189b6f11e67e19cf58301944814 to before 20a7510e781084364691b4962de31de758194cc9Affected
  • afc76b8b80112189b6f11e67e19cf58301944814 to before 8547649981e6631328cd64f583667501ae385531Affected
LinuxLinux
  • 5.12Affected
  • before 5.12Not affected
  • 6.1.23 through 6.1.*Not affected
  • 6.2.3 through 6.2.*Not affected
  • 6.3 and laterNot affected

References

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