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CVE-2021-47440

2.3 · LOW

In the Linux kernel, the following vulnerability has been resolved: net: encx24j600: check error in devm_regmap_init_encx24j600 devm_regmap_init may return error which caused by like out of memor…

Published May 22, 2024CWE-476EPSS 0.21%

Overview

CVE-2021-47440 is a low-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 2.3 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.3, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: encx24j600: check error in devm_regmap_init_encx24j600

devm_regmap_init may return error which caused by like out of memory,

this will results in null pointer dereference later when reading

or writing register:

general protection fault in encx24j600_spi_probe

KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097]

CPU: 0 PID: 286 Comm: spi-encx24j600- Not tainted 5.15.0-rc2-00142-g9978db750e31-dirty #11 9c53a778c1306b1b02359f3c2bbedc0222cba652

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014

RIP: 0010:regcache_cache_bypass drivers/base/regmap/regcache.c:540

Code: 54 41 89 f4 55 53 48 89 fb 48 83 ec 08 e8 26 94 a8 fe 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 4a 03 00 00 4c 8d ab b0 00 00 00 48 8b ab a0 00

RSP: 0018:ffffc900010476b8 EFLAGS: 00010207

RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: 000000000000

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/322c0e53496309e634d9db7349678eaad1d25b55Refgit.kernel.org/stable/c/4c2eb80fc90b05559ce6ed1b8dfb2348420b5644Refgit.kernel.org/stable/c/5e5494e6fc8a29c927e0478bec4a078a40da8901Refgit.kernel.org/stable/c/66358471fa75a713fd76bc8a4bd74cb14cd50a4fRefgit.kernel.org/stable/c/e19c10d6e07c59c96e90fe053a72683ad8b0397eRefgit.kernel.org/stable/c/f03dca0c9e2297c84a018e306f8a9cd534ee4287Refgit.kernel.org/stable/c/f043fac1133a6c5ef960a8422c0f6dd711dee462Refgit.kernel.org/stable/c/fddc7f678d7fb93caa0d7bc512f968ff1e2bddbcRefgit.kernel.org/stable/c/322c0e53496309e634d9db7349678eaad1d25b55Refgit.kernel.org/stable/c/4c2eb80fc90b05559ce6ed1b8dfb2348420b5644

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47440?

CVE-2021-47440 is a low-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 2.3 (LOW).

How severe is CVE-2021-47440?

This vulnerability has a CVSS 3.1 base score of 2.3, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47440?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47440?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47440 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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