sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2021-47397
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-05-21 15:15:25 UTC
Updated2026-08-04 10:17:01 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f 77bc7dcf0fcc1519341a91788d7a2914fcfddf6d git Not specified
CNA Linux Linux affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f 8c630a7b4f9dec63f08bd881ab77984a724a5124 git Not specified
CNA Linux Linux affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1 git Not specified
CNA Linux Linux affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f 9c6591ae8e63f93c895ad5e2703c36c548aac997 git Not specified
CNA Linux Linux affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f 8180611c238e11676612eb2a9828b1c7a3a4d77b git Not specified
CNA Linux Linux affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f f7e745f8e94492a8ac0b0a26e25f2b19d342918f git Not specified
CNA Linux Linux affected 4.8 Not specified
CNA Linux Linux unaffected 4.8 semver Not specified
CNA Linux Linux unaffected 4.14.249 4.14.* semver Not specified
CNA Linux Linux unaffected 4.19.209 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.151 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.71 5.10.* semver Not specified
CNA Linux Linux unaffected 5.14.10 5.14.* semver Not specified
CNA Linux Linux unaffected 5.15 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/77bc7dcf0fcc1519341a91788d7a2914fcfddf6d af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77b af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/f7e745f8e94492a8ac0b0a26e25f2b19d342918f af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
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