CVE-2026-32282— TOCTOU permits root escape on Linux via Root.Chmod in os in internal/syscall/unix
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I. Basic Information for CVE-2026-32282
Vulnerability Information
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Vulnerability Title
TOCTOU permits root escape on Linux via Root.Chmod in os in internal/syscall/unix
Source: NVD (National Vulnerability Database)
Vulnerability Description
On Linux, if the target of Root.Chmod is replaced with a symlink while the chmod operation is in progress, Chmod can operate on the target of the symlink, even when the target lies outside the root. The Linux fchmodat syscall silently ignores the AT_SYMLINK_NOFOLLOW flag, which Root.Chmod uses to avoid symlink traversal. Root.Chmod checks its target before acting and returns an error if the target is a symlink lying outside the root, so the impact is limited to cases where the target is replaced with a symlink between the check and operation.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于Root.Chmod操作期间目标被符号链接替换时，可能对根目录外的目标进行操作。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Go standard library | internal/syscall/unix | 0 ~ 1.25.9 | - |
II. Public POCs for CVE-2026-32282
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Go standard library · 2026-04-08 · 7 CVEs total
| CVE-2026-32280 | Unexpected work during chain building in crypto/x509 | |
| CVE-2026-32288 | Unbounded allocation for old GNU sparse in archive/tar | |
| CVE-2026-32289 | JsBraceDepth Context Tracking Bugs (XSS) in html/template | |
| CVE-2026-32281 | Inefficient policy validation in crypto/x509 | |
| CVE-2026-32283 | Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS | |
| CVE-2026-33810 | Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509 |
IV. Related Vulnerabilities
Same vendor: Go standard library
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Bypass of meta content URL escaping causes XSS in html/templ - CVE-2026-39820
Quadratic string concatentation in consumeComment in net/mai - CVE-2026-33811
Crash when handling long CNAME response in net - CVE-2026-39826
Escaper bypass leads to XSS in html/template - CVE-2026-42499
Quadratic string concatenation in consumePhrase in net/mail
V. Comments for CVE-2026-32282
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