CVE-2026-86805— AT_SECURE programs may load attacker-controlled code via $ORIGIN
一分钟漏洞结论
影响对象
The GNU C Library glibc
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。
A time-of-check to time-of-use (TOCTOU) race condition in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44 allows a local attacker to escalate privileges. When expanding $ORIGIN in DT_RPATH for setuid/setgid (AT_SECURE) progra
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| The GNU C Library | glibc | 2.14< 2.45 |
affected |
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一、 漏洞 CVE-2026-86805 基础信息
漏洞信息
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Vulnerability Title
AT_SECURE programs may load attacker-controlled code via $ORIGIN
来源: CVE Program / CVE List V5
Vulnerability Description
A time-of-check to time-of-use (TOCTOU) race condition in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44 allows a local attacker to escalate privileges. When expanding $ORIGIN in DT_RPATH for setuid/setgid (AT_SECURE) programs, glibc validates the lexically normalized search path against the trusted directories but then opens the raw, un-normalized path. On systems where the Linux fs.protected_hardlinks sysctl is disabled, a local attacker who hard-links such a program into an attacker-controlled directory and wins a race to replace an intermediate path component with a symbolic link can direct the loader outside the trusted directory, causing it to load an attacker-controlled shared object and execute arbitrary code with the elevated privileges of the program.
Exploitation requires an installed setuid or setgid binary whose DT_RPATH uses $ORIGIN followed by ".." traversal that normalizes into a trusted directory, and the ability to hard-link that binary and win the race by swapping a path component for a symbolic link. Major Linux-based OS distributions ship with fs.protected_hardlinks enabled by default and mitigate the vulnerability.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L
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 |
|---|---|---|---|---|
| The GNU C Library | glibc | 2.14 ~ 2.45 | - |
|
二、漏洞 CVE-2026-86805 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-86805 其他参考 (2)
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Making sure you're not a bot! vendor-advisory
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Making sure you're not a bot! issue-tracking
IV. Related Vulnerabilities
V. Comments for CVE-2026-86805
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