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
CVE 정보
EPSS
EPSS는 취약점이 악용될 가능성을 예측하는 점수 모델입니다.
EPSS 점수
EPSS 모델은 0과 1(0~100%) 사이의 확률 점수를 생성합니다. 점수가 높을수록 취약점이 악용될 가능성이 높습니다.
날짜
EPSS V0
EPSS V1
EPSS V2 (> 2022-02-04)
EPSS V3 (> 2025-03-07)
EPSS V4 (> 2025-03-17)
2025-10-23
–
–
–
–
0.02%
2025-10-28
–
–
–
–
0.02%
2025-11-01
–
–
–
–
0.02%
2025-11-04
–
–
–
–
0.02%
2025-11-06
–
–
–
–
0.02%
2025-11-18
–
–
–
–
0.02%
2025-11-21
–
–
–
–
0.02%
2025-12-03
–
–
–
–
0.02%
2025-12-04
–
–
–
–
0.02%
2025-12-05
–
–
–
–
0.02%
2025-12-29
–
–
–
–
0.03%
2026-02-22
–
–
–
–
0.03%
2026-03-22
–
–
–
–
0.02%
2026-04-05
–
–
–
–
0.02%
2026-04-26
–
–
–
–
0.02%
2026-05-28
–
–
–
–
0.02%
EPSS 백분위수
백분위수는 EPSS 점수에 따라 CVE의 순위를 매기는 데 사용됩니다. 예를 들어 EPSS 점수 기준 95번째 백분위수의 CVE는 다른 CVE의 95%보다 악용될 가능성이 높습니다.