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CVE-2026-53613— util-linux mount target TOCTOU allows local privilege escalation

一分钟漏洞结论

影响对象
util-linux util-linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

util-linux is a random collection of Linux utilities. In util-linux 2.17 through 2.41.6 and 2.42 through 2.42.3, and in 2.42.4 when the legacy path is used without , restricted non-root requests validate an target before the mount operation re-resolves that pa

CVSS 7.0 · High

影响版本矩阵 2

厂商产品 版本范围状态
util-linux util-linux >= 2.17, <= 2.41.6 affected
>= 2.42, <= 2.42.4 affected
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一、 漏洞 CVE-2026-53613 基础信息

漏洞信息

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Vulnerability Title
util-linux mount target TOCTOU allows local privilege escalation
来源: CVE Program / CVE List V5
Vulnerability Description
util-linux is a random collection of Linux utilities. In util-linux 2.17 through 2.41.6 and 2.42 through 2.42.3, and in 2.42.4 when the legacy `mount(2)` path is used without `/proc`, restricted non-root `mount` requests validate an `/etc/fstab` target before the mount operation re-resolves that pathname. A local low-privileged user authorized by an fstab `user` or `users` entry whose target has an attacker-writable ancestor can use `renameat2(RENAME_EXCHANGE)` to swap a path component and redirect an authorized mount to a root-owned location, such as mounting attacker-controlled content over `/etc/sudoers.d`, and thereby gain root privileges. Versions 2.41.5 and 2.42.2 pin targets for the new mount API, and 2.42.4 pins legacy targets through `/proc/self/fd`; the documented legacy fallback without `/proc` remains affected.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
util-linux util-linux >= 2.17, <= 2.41.6 -

二、漏洞 CVE-2026-53613 的公开POC

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三、漏洞 CVE-2026-53613 的情报信息

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CVE-2026-53613 补丁与修复 (10)

CVE-2026-53613 其他参考 (4)

同批安全公告 · util-linux · 2026-10-14 · 共 4 条

CVE-2026-53615 8.0 HIGH util-linux libblkid DOS extended-partition overflow produces invalid partition metadata
CVE-2026-53612 7.0 HIGH util-linux mount hook_owner TOCTOU allows local privilege escalation
CVE-2026-53614 7.0 HIGH util-linux LIBMOUNT_FORCE_MOUNT2 allows nosuid and noexec bypass

IV. Related Vulnerabilities

Same product: util-linux
Same vendor: util-linux
Same weakness: CWE-367

V. Comments for CVE-2026-53613

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