CVE-2026-32282
TOCTOU permits root escape on Linux via Root.Chmod in os in internal/syscall/unix
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.
INFO
Published Date :
April 8, 2026, 2:16 a.m.
Last Modified :
April 16, 2026, 7:15 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Apply system patches to fix the fchmodat syscall behavior.
- Avoid Chmod operations on files with potential symlink races.
- Ensure file integrity checks are performed before Chmod.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-32282.
| URL | Resource |
|---|---|
| https://go.dev/cl/763761 | Patch |
| https://go.dev/issue/78293 | Issue Tracking |
| https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU | Release Notes Mailing List |
| https://pkg.go.dev/vuln/GO-2026-4864 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-32282 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-32282
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-32282 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-32282 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 16, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-59 Added CPE Configuration OR *cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions up to (excluding) 1.25.9 *cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions from (including) 1.26.0 up to (excluding) 1.26.2 Added Reference Type Go Project: https://go.dev/cl/763761 Types: Patch Added Reference Type Go Project: https://go.dev/issue/78293 Types: Issue Tracking Added Reference Type Go Project: https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU Types: Mailing List, Release Notes Added Reference Type Go Project: https://pkg.go.dev/vuln/GO-2026-4864 Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by [email protected]
Apr. 08, 2026
Action Type Old Value New Value Added 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. Added Reference https://go.dev/cl/763761 Added Reference https://go.dev/issue/78293 Added Reference https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU Added Reference https://pkg.go.dev/vuln/GO-2026-4864