CVE-2021-47397

sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb

MEDIUM

5.5

CVSS Score

Published: May 21, 2024 at 03:03 PM UTC

Updated: August 5, 2026 at 09:24 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.8%

SSVC

No known exploit

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.15 ≤ v < 4.19.2094.20 ≤ v < 5.4.1514.8 ≤ v < 4.14.2494.8 ≤ v < 4.19.2094.8 ≤ v < 5.10.714.8 ≤ v < 5.14.104.8 ≤ v < 5.154.8 ≤ v < 5.4.1515.11 ≤ v < 5.14.105.5 ≤ v < 5.10.713acb50c18d8d6650f10919464ade4dcdaf41d62f5.15 rc1 5.15 rc2 5.15 rc3

Vendor states this is fixed in 77bc7dcf0fcc1519341a91788d7a2914fcfddf6d (fixed)

Vendor states this is fixed in 8180611c238e11676612eb2a9828b1c7a3a4d77b (fixed)

Vendor states this is fixed in 8c630a7b4f9dec63f08bd881ab77984a724a5124 (fixed)

Vendor states this is fixed in 9c6591ae8e63f93c895ad5e2703c36c548aac997 (fixed)

Vendor states this is fixed in ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1 (fixed)

Vendor states this is fixed in f7e745f8e94492a8ac0b0a26e25f2b19d342918f (fixed)

Vendor states this is fixed in 4.14.249 (unaffected)

Vendor states this is fixed in 4.19.209 (unaffected)

Vendor states this is fixed in 4.8 (unaffected)

Vendor states this is fixed in 5.10.71 (unaffected)

Vendor states this is fixed in 5.14.10 (unaffected)

Vendor states this is fixed in 5.15 (unaffected)