CVE-2021-47397 (GCVE-0-2021-47397)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2026-05-11 13:53
VLAI?
Title
sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb
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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3acb50c18d8d6650f10919464ade4dcdaf41d62f , < 77bc7dcf0fcc1519341a91788d7a2914fcfddf6d (git)
Affected: 3acb50c18d8d6650f10919464ade4dcdaf41d62f , < 8c630a7b4f9dec63f08bd881ab77984a724a5124 (git)
Affected: 3acb50c18d8d6650f10919464ade4dcdaf41d62f , < ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1 (git)
Affected: 3acb50c18d8d6650f10919464ade4dcdaf41d62f , < 9c6591ae8e63f93c895ad5e2703c36c548aac997 (git)
Affected: 3acb50c18d8d6650f10919464ade4dcdaf41d62f , < 8180611c238e11676612eb2a9828b1c7a3a4d77b (git)
Affected: 3acb50c18d8d6650f10919464ade4dcdaf41d62f , < f7e745f8e94492a8ac0b0a26e25f2b19d342918f (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 4.14.249 , ≤ 4.14.* (semver)
Unaffected: 4.19.209 , ≤ 4.19.* (semver)
Unaffected: 5.4.151 , ≤ 5.4.* (semver)
Unaffected: 5.10.71 , ≤ 5.10.* (semver)
Unaffected: 5.14.10 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47397\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:25.017\",\"lastModified\":\"2024-12-24T16:06:56.063\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb\\n\\nWe should always check if skb_header_pointer\u0027s return is NULL before\\nusing it, otherwise it may cause null-ptr-deref, as syzbot reported:\\n\\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\\n  RIP: 0010:sctp_rcv_ootb net/sctp/input.c:705 [inline]\\n  RIP: 0010:sctp_rcv+0x1d84/0x3220 net/sctp/input.c:196\\n  Call Trace:\\n  \u003cIRQ\u003e\\n   sctp6_rcv+0x38/0x60 net/sctp/ipv6.c:1109\\n   ip6_protocol_deliver_rcu+0x2e9/0x1ca0 net/ipv6/ip6_input.c:422\\n   ip6_input_finish+0x62/0x170 net/ipv6/ip6_input.c:463\\n   NF_HOOK include/linux/netfilter.h:307 [inline]\\n   NF_HOOK include/linux/netfilter.h:301 [inline]\\n   ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472\\n   dst_input include/net/dst.h:460 [inline]\\n   ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline]\\n   NF_HOOK include/linux/netfilter.h:307 [inline]\\n   NF_HOOK include/linux/netfilter.h:301 [inline]\\n   ipv6_rcv+0x28c/0x3c0 net/ipv6/ip6_input.c:297\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sctp: se rompe si skb_header_pointer devuelve NULL en sctp_rcv_ootb. Siempre debemos verificar si el retorno de skb_header_pointer es NULL antes de usarlo; de lo contrario, puede causar null-ptr-deref, como inform\u00f3 syzbot: KASAN : null-ptr-deref en el rango [0x0000000000000000-0x0000000000000007] RIP: 0010:sctp_rcv_ootb net/sctp/input.c:705 [en l\u00ednea] RIP: 0010:sctp_rcv+0x1d84/0x3220 net/sctp/input .c:196 Seguimiento de llamadas :  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 incluir/linux /netfilter.h:307 [en l\u00ednea] NF_HOOK include/linux/netfilter.h:301 [en l\u00ednea] ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472 dst_input include/net/dst.h:460 [en l\u00ednea] ip6_rcv_finish net/ipv6/ip6_input.c:76 [en l\u00ednea] NF_HOOK include/linux/netfilter.h:307 [en l\u00ednea] NF_HOOK include/linux/netfilter.h:301 [en l\u00ednea] ipv6_rcv+0x28c/0x3c0 net/ipv6/ip6_input.c 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    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2021-47397\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:10:07.501Z\", \"dateReserved\": \"2024-05-21T14:58:30.815Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:03:53.431Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.