CVE-2021-47397

sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb

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_rcv+0x28c/0x3c0 net/ipv6/ip6_input.c:297

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.05%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/77bc7dcf0fcc1519341a91788d7a2914fcfddf6d patch
https://git.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124 patch
https://git.kernel.org/stable/c/ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1 patch
https://git.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997 patch
https://git.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77b patch
https://git.kernel.org/stable/c/f7e745f8e94492a8ac0b0a26e25f2b19d342918f patch

Frequently Asked Questions

What is the severity of CVE-2021-47397?
CVE-2021-47397 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47397?
To fix CVE-2021-47397, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47397 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47397 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47397?
CVE-2021-47397 affects Linux Linux, Linux Linux.
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