CVE-2026-45256MEDIUM· 5.5MITRENVD대응게시일: 2026. 06. 26.수정일: 2026. 06. 26.CNA: secteam@freebsd.orgAnalyzed

When used to deliver a signal to a specific thread, thr_kill2(2) called p_cansignal() to determine whether the operation was permitted but d

Privilege-Escalation

위협 신호 · CVSS · EPSS · KEV

정기 패치· 높은 악용 신호 없음

CVSS

5.5medium

이론적 심각도 점수

EPSS

0.1%상위 99.4%

30일 내 악용 확률 예측

KEV

미등재

실측 악용 기록 없음

권장 대응 기한차기 업그레이드 시CISA SSVC 기준

별도 긴급 패치 불필요 — 정기 시스템 업그레이드 주기에 맞춰 조치

· KEV 미등재 · 자동화 어려움 · 부분 영향 · 내부 한정

CVSS 벡터 · 메트릭

악용 경로

공격 벡터로컬

공격 복잡도낮음

필요 권한낮음

사용자 상호작용불필요

범위불변

영향

기밀성 영향없음

무결성 영향없음

가용성 영향높음

버전별 점수

CVSS 3.15.5MEDIUM· 악용성 1.8· 영향도 3.6

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

약점 (CWE)

CWE-269
부적절한 권한 관리 — 권한 부여/상승 처리 결함으로 권한 상승 위험.

상세 설명

When used to deliver a signal to a specific thread, thr_kill2(2) called p_cansignal() to determine whether the operation was permitted but did not check the result before delivering the signal. The signal was sent even when the permission check failed. The system call returned the resulting error to the caller, but by then the signal had already been delivered.

The missing check allows an unprivileged local user who knows or can guess a target's process and thread IDs to send any signal to a process they would not normally be permitted to signal, including processes owned by other users or by root. The same check enforces jail boundaries, so a jailed process can signal processes on the host or in other jails. Thread IDs are allocated globally and sequentially, and so can be discovered by brute force with no visibility into the target.

An attacker can stop or terminate arbitrary processes, including critical system daemons, resulting in a Denial of Service (DoS).

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영향받는 제품·버전

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영향받는 구성 (CPE) 33

freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p10:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p11:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p12:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p13:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p14:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p8:*:*:*:*:*:*
freebsd freebsd 14.3cpe:2.3:o:freebsd:freebsd:14.3:p9:*:*:*:*:*:*
freebsd freebsd 14.4cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*
freebsd freebsd 14.4cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:*
freebsd freebsd 14.4cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:*
freebsd freebsd 14.4cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:*
freebsd freebsd 14.4cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:*
freebsd freebsd 14.4cpe:2.3:o:freebsd:freebsd:14.4:p5:*:*:*:*:*:*
freebsd freebsd 14.4cpe:2.3:o:freebsd:freebsd:14.4:rc1:*:*:*:*:*:*
freebsd freebsd 15.0cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*
freebsd freebsd 15.0cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*
freebsd freebsd 15.0cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*
freebsd freebsd 15.0cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*
freebsd freebsd 15.0cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*
freebsd freebsd 15.0cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:*
freebsd freebsd 15.0cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:*
freebsd freebsd 15.0cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:*
freebsd freebsd 15.0cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:*
freebsd freebsd 15.0cpe:2.3:o:freebsd:freebsd:15.0:p9:*:*:*:*:*:*
freebsd freebsd 15.1cpe:2.3:o:freebsd:freebsd:15.1:rc2:*:*:*:*:*:*

참고 자료 1

https://security.freebsd.org/advisories/FreeBSD-SA-26:25.thr.asc
Vendor Advisory

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