CVE-2026-28529
cryptodev-linux <= 1.14 get_userbuf Use After Free LPE
Description
cryptodev-linux version 1.14 and prior contain a page reference handling flaw in the get_userbuf function of the /dev/crypto device driver that allows local users to trigger use-after-free conditions. Attackers with access to the /dev/crypto interface can repeatedly decrement reference counts of controlled pages to achieve local privilege escalation.
INFO
Published Date :
March 25, 2026, 2:16 p.m.
Last Modified :
Aug. 17, 2026, 6:02 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update cryptodev-linux to the latest version.
- Apply vendor patches for the get_userbuf function.
- Restrict access to the /dev/crypto device.
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-2026-28529.
| URL | Resource |
|---|---|
| https://gist.github.com/n4sm/0fd2479e0c23e0fa2f192cd8fda45750 | Exploit |
| https://github.com/cryptodev-linux/cryptodev-linux/pull/104 | Patch Third Party Advisory |
| https://nasm.re/posts/cryptodev-linux-vuln/ | Third Party Advisory |
| https://www.vulncheck.com/advisories/cryptodev-linux-get-userbuf-use-after-free-lpe | Third Party 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-2026-28529 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-2026-28529
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-2026-28529 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-28529 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]
Aug. 17, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:cryptodev-linux:cryptodev-linux:*:*:*:*:*:*:*:* versions up to (including) 1.14 Added Reference Type VulnCheck: https://gist.github.com/n4sm/0fd2479e0c23e0fa2f192cd8fda45750 Types: Exploit Added Reference Type VulnCheck: https://github.com/cryptodev-linux/cryptodev-linux/pull/104 Types: Patch, Third Party Advisory Added Reference Type VulnCheck: https://nasm.re/posts/cryptodev-linux-vuln/ Types: Third Party Advisory Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/cryptodev-linux-get-userbuf-use-after-free-lpe Types: Third Party Advisory -
CVE Modified by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://github.com/cryptodev-linux/cryptodev-linux', 'vendor': 'cryptodev-linux', 'product': 'cryptodev-linux', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.14'}], 'defaultStatus': 'unknown'}] [{'repo': 'https://github.com/cryptodev-linux/cryptodev-linux', 'vendor': 'cryptodev-linux', 'product': 'cryptodev-linux', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.14'}], 'packageURL': 'pkg:github/cryptodev-linux/cryptodev-linux', 'defaultStatus': 'unknown'}] -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/cryptodev-linux/cryptodev-linux', 'vendor': 'cryptodev-linux', 'product': 'cryptodev-linux', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.14'}], 'defaultStatus': 'unknown'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-28529', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-03-25T13:47:38.970778Z'} -
New CVE Received by [email protected]
Mar. 25, 2026
Action Type Old Value New Value Added Description cryptodev-linux version 1.14 and prior contain a page reference handling flaw in the get_userbuf function of the /dev/crypto device driver that allows local users to trigger use-after-free conditions. Attackers with access to the /dev/crypto interface can repeatedly decrement reference counts of controlled pages to achieve local privilege escalation. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-416 Added Reference https://gist.github.com/n4sm/0fd2479e0c23e0fa2f192cd8fda45750 Added Reference https://github.com/cryptodev-linux/cryptodev-linux/pull/104 Added Reference https://nasm.re/posts/cryptodev-linux-vuln/ Added Reference https://www.vulncheck.com/advisories/cryptodev-linux-get-userbuf-use-after-free-lpe