CVE-2021-47397

Summary

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

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3acb50c18d8d6650f10919464ade4dcdaf41d62f < 77bc7dcf0fcc1519341a91788d7a2914fcfddf6daffected
LinuxLinux3acb50c18d8d6650f10919464ade4dcdaf41d62f < 8c630a7b4f9dec63f08bd881ab77984a724a5124affected
LinuxLinux3acb50c18d8d6650f10919464ade4dcdaf41d62f < ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1affected
LinuxLinux3acb50c18d8d6650f10919464ade4dcdaf41d62f < 9c6591ae8e63f93c895ad5e2703c36c548aac997affected
LinuxLinux3acb50c18d8d6650f10919464ade4dcdaf41d62f < 8180611c238e11676612eb2a9828b1c7a3a4d77baffected
LinuxLinux3acb50c18d8d6650f10919464ade4dcdaf41d62f < f7e745f8e94492a8ac0b0a26e25f2b19d342918faffected
LinuxLinux4.8affected
LinuxLinux0 < 4.8unaffected
LinuxLinux4.14.249 <= 4.14.*unaffected
LinuxLinux4.19.209 <= 4.19.*unaffected
LinuxLinux5.4.151 <= 5.4.*unaffected
LinuxLinux5.10.71 <= 5.10.*unaffected
LinuxLinux5.14.10 <= 5.14.*unaffected
LinuxLinux5.15 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References