CVE-2021-47397

sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb

State: Published
Severity: 7.5 High
Published: May 21, 2024
Updated: Aug 5, 2026
Reserved: May 21, 2024

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

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	3acb50c18d8d6650f10919464ade4dcdaf41d62f to before 77bc7dcf0fcc1519341a91788d7a2914fcfddf6dAffected 3acb50c18d8d6650f10919464ade4dcdaf41d62f to before 8c630a7b4f9dec63f08bd881ab77984a724a5124Affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f to before ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1Affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f to before 9c6591ae8e63f93c895ad5e2703c36c548aac997Affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f to before 8180611c238e11676612eb2a9828b1c7a3a4d77bAffected 3acb50c18d8d6650f10919464ade4dcdaf41d62f to before f7e745f8e94492a8ac0b0a26e25f2b19d342918fAffected
LinuxLinux	4.8Affected before 4.8Not affected 4.14.249 through 4.14.Not affected 4.19.209 through 4.19.Not affected 5.4.151 through 5.4.Not affected 5.10.71 through 5.10.Not affected 5.14.10 through 5.14.*Not affected 5.15 and laterNot affected

Product

Versions

LinuxLinux

3acb50c18d8d6650f10919464ade4dcdaf41d62f to before 77bc7dcf0fcc1519341a91788d7a2914fcfddf6dAffected
3acb50c18d8d6650f10919464ade4dcdaf41d62f to before 8c630a7b4f9dec63f08bd881ab77984a724a5124Affected
3acb50c18d8d6650f10919464ade4dcdaf41d62f to before ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1Affected
3acb50c18d8d6650f10919464ade4dcdaf41d62f to before 9c6591ae8e63f93c895ad5e2703c36c548aac997Affected
3acb50c18d8d6650f10919464ade4dcdaf41d62f to before 8180611c238e11676612eb2a9828b1c7a3a4d77bAffected
3acb50c18d8d6650f10919464ade4dcdaf41d62f to before f7e745f8e94492a8ac0b0a26e25f2b19d342918fAffected

LinuxLinux

4.8Affected
before 4.8Not affected
4.14.249 through 4.14.*Not affected
4.19.209 through 4.19.*Not affected
5.4.151 through 5.4.*Not affected
5.10.71 through 5.10.*Not affected
5.14.10 through 5.14.*Not affected
5.15 and laterNot affected

References

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