CVE-2021-35039

Name: CVE-2021-35039
Creator: NVD / NIST
Published: 2021-07-07T01:15:07.517+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.25%

Last modified Jun 17, 2026

CVE-2021-35039 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification, aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG, verification that a kernel module is signed, for loading via init_module, does not occur for a module.sig_enforce=1 command-line argument.. EPSS estimates a 0.25% chance of exploitation in the next 30 days.

Description

kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification, aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG, verification that a kernel module is signed, for loading via init_module, does not occur for a module.sig_enforce=1 command-line argument.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.25%

15.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 4.15, < 4.19.196
Linux	Linux Kernel	>= 4.20, < 5.4.129
Linux	Linux Kernel	>= 5.5, < 5.10.47
Linux	Linux Kernel	>= 5.11, < 5.12.14
Debian	Debian Linux	9.0

References

http://www.openwall.com/lists/oss-security/2021/07/06/3Mailing List, Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.14Mailing List, Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0c18f29aae7ce3dadd26d8ee3505d07cc982df75Mailing List, Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/0c18f29aae7ce3dadd26d8ee3505d07cc982df75Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210813-0004/Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/07/06/3Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/07/06/3Mailing List, Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.14Mailing List, Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0c18f29aae7ce3dadd26d8ee3505d07cc982df75Mailing List, Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/0c18f29aae7ce3dadd26d8ee3505d07cc982df75Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210813-0004/Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/07/06/3Mailing List, Third Party Advisory

Timeline

Published: Jul 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-35039?

How severe is CVE-2021-35039?

CVE-2021-35039 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.25% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35039?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-35039?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST