CVE-2021-47397 sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb

2024-05-2115:03:53

Linux

www.cve.org

linux kernel

vulnerability

sctp

skb_header_pointer

null pointer dereference

syzbot reported

6.4 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

10.4%

JSON

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

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/sctp/input.c"
    ],
    "versions": [
      {
        "version": "3acb50c18d8d",
        "lessThan": "77bc7dcf0fcc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3acb50c18d8d",
        "lessThan": "8c630a7b4f9d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3acb50c18d8d",
        "lessThan": "ec018021cf44",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3acb50c18d8d",
        "lessThan": "9c6591ae8e63",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3acb50c18d8d",
        "lessThan": "8180611c238e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3acb50c18d8d",
        "lessThan": "f7e745f8e944",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/sctp/input.c"
    ],
    "versions": [
      {
        "version": "4.8",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.8",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.14.249",
        "lessThanOrEqual": "4.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.209",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.151",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.71",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.14.10",
        "lessThanOrEqual": "5.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]