CVE-2021-47397
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,…
Does this matter?
Lower severity and a low EPSS score (0.77%). Track it; it rarely justifies an emergency change on its own.
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
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.77% probability · 54th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/77bc7dcf0fcc1519341a91788d7a2914fcfddf6dPatch
- https://git.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77bPatch
- https://git.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124Patch
- https://git.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997Patch
- https://git.kernel.org/stable/c/ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1Patch
- https://git.kernel.org/stable/c/f7e745f8e94492a8ac0b0a26e25f2b19d342918fPatch
- https://git.kernel.org/stable/c/77bc7dcf0fcc1519341a91788d7a2914fcfddf6dPatch
- https://git.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77bPatch
- https://git.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124Patch
- https://git.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997Patch
- https://git.kernel.org/stable/c/ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1Patch
- https://git.kernel.org/stable/c/f7e745f8e94492a8ac0b0a26e25f2b19d342918fPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.