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CVE-2021-47597

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: inet_diag: fix kernel-infoleak for UDP sockets KMSAN reported a kernel-infoleak [1], that can exploited by unpriv users.

Published Jun 19, 2024CWE-908EPSS 0.25%

Overview

CVE-2021-47597 is a medium-severity vulnerability. It was published on June 19, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

inet_diag: fix kernel-infoleak for UDP sockets

KMSAN reported a kernel-infoleak [1], that can exploited

by unpriv users.

After analysis it turned out UDP was not initializing

r->idiag_expires. Other users of inet_sk_diag_fill()

might make the same mistake in the future, so fix this

in inet_sk_diag_fill().

[1]

BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline]

BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:156 [inline]

BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670

instrument_copy_to_user include/linux/instrumented.h:121 [inline]

copyout lib/iov_iter.c:156 [inline]

_copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670

copy_to_iter include/linux/uio.h:155 [inline]

simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519

__skb_datagram_iter+0x2cb/0x1280 net/core/datagram.c:425

skb_copy_datagram_iter+0xdc/0x270 net/core/datagram.c:533

skb_

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/3a4f6dba1eb98101abc012ef968a8b10dac1ce50Refgit.kernel.org/stable/c/71ddeac8cd1d217744a0e060ff520e147c9328d1Refgit.kernel.org/stable/c/7b5596e531253ce84213d9daa7120b71c9d83198Refgit.kernel.org/stable/c/e5d28205bf1de7082d904ed277ceb2db2879e302Refgit.kernel.org/stable/c/3a4f6dba1eb98101abc012ef968a8b10dac1ce50Refgit.kernel.org/stable/c/71ddeac8cd1d217744a0e060ff520e147c9328d1Refgit.kernel.org/stable/c/7b5596e531253ce84213d9daa7120b71c9d83198Refgit.kernel.org/stable/c/e5d28205bf1de7082d904ed277ceb2db2879e302

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47597?

CVE-2021-47597 is a medium-severity vulnerability. It was published on June 19, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47597?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47597?

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-2021-47597?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47597 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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