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CVE-2021-47397

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb We should always check if skb_header_pointer's return is NU…

Published May 21, 2024CWE-476EPSS 0.78%

Overview

CVE-2021-47397 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb

We should always check if skb_header_pointer's return is NULL before

using it, otherwise it may cause null-ptr-deref, as syzbot reported:

KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]

RIP: 0010:sctp_rcv_ootb net/sctp/input.c:705 [inline]

RIP: 0010:sctp_rcv+0x1d84/0x3220 net/sctp/input.c:196

Call Trace:

<IRQ>

sctp6_rcv+0x38/0x60 net/sctp/ipv6.c:1109

ip6_protocol_deliver_rcu+0x2e9/0x1ca0 net/ipv6/ip6_input.c:422

ip6_input_finish+0x62/0x170 net/ipv6/ip6_input.c:463

NF_HOOK include/linux/netfilter.h:307 [inline]

NF_HOOK include/linux/netfilter.h:301 [inline]

ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472

dst_input include/net/dst.h:460 [inline]

ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline]

NF_HOOK include/linux/netfilter.h:307 [inline]

NF_HOOK include/linux/netfilter.h:301 [inline]

ipv6

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/77bc7dcf0fcc1519341a91788d7a2914fcfddf6dRefgit.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77bRefgit.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124Refgit.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997Refgit.kernel.org/stable/c/ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1Refgit.kernel.org/stable/c/f7e745f8e94492a8ac0b0a26e25f2b19d342918fRefgit.kernel.org/stable/c/77bc7dcf0fcc1519341a91788d7a2914fcfddf6dRefgit.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77bRefgit.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124Refgit.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47397?

CVE-2021-47397 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-47397?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47397?

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-2021-47397?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47397 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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