CVE-2021-47397

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net/sctp/input.c:196\n Call Trace:\n <IRQ>\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"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is in sctp_rcv_ootb(), reached from sctp4_rcv/sctp6_rcv on the IPPROTO_SCTP receive path when processing out-of-the-blue packets; a remote peer can deliver crafted SCTP packets over IPv4/IPv6 with no local socket required beyond the SCTP stack being loaded.\nAC:L - The attacker only needs to send crafted SCTP packets that fail association lookup and enter the OOTB walker; there is no race, victim-side state, or other condition outside the attacker\u2019s control required to hit the unchecked skb_header_pointer() result.\nPR:N - OOTB handling runs for packets that match no association, falls back to the per-net ctl_sock endpoint, and requires no authentication or privileges on the target.\nUI:N - Exploitation requires only sending network packets; no user action such as opening a file or establishing an application session is needed.\nS:U - Impact is confined to the vulnerable host\u2019s kernel (crash/DoS); this does not cross a VM, IOMMU, or other security authority boundary.\nC:N - The defect is a pure NULL pointer dereference of skb_header_pointer()\u2019s return value when reading ch->length; it does not disclose kernel memory.\nI:N - There is no write, type confusion, or other memory corruption primitive\u2014only a NULL deref\u2014so integrity cannot be compromised beyond the crash itself.\nA:H - Dereferencing the NULL chunk header pointer causes a kernel oops/general protection fault in softirq/IRQ receive context, which is a full availability impact and can be repeated with further packets."}]}], "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": "3acb50c18d8d6650f10919464ade4dcdaf41d62f", "lessThan": "77bc7dcf0fcc1519341a91788d7a2914fcfddf6d", "status": "affected", "versionType": "git"}, {"version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f", "lessThan": "8c630a7b4f9dec63f08bd881ab77984a724a5124", "status": "affected", "versionType": "git"}, {"version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f", "lessThan": "ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1", "status": "affected", 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header pointer causes a kernel oops/general protection fault in softirq/IRQ receive context, which is a full availability impact and can be repeated with further packets."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f", "lessThan": "77bc7dcf0fcc1519341a91788d7a2914fcfddf6d", "versionType": "git"}, {"status": "affected", "version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f", "lessThan": "8c630a7b4f9dec63f08bd881ab77984a724a5124", "versionType": "git"}, {"status": "affected", "version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f", "lessThan": "ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1", "versionType": "git"}, {"status": "affected", "version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f", "lessThan": "9c6591ae8e63f93c895ad5e2703c36c548aac997", "versionType": "git"}, {"status": "affected", "version": 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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 :297"}], "id": "CVE-2021-47397", "lastModified": "2026-08-04T10:17:01.747", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47397", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:38:10.305778Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:25.017", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/77bc7dcf0fcc1519341a91788d7a2914fcfddf6d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f7e745f8e94492a8ac0b0a26e25f2b19d342918f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/77bc7dcf0fcc1519341a91788d7a2914fcfddf6d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f7e745f8e94492a8ac0b0a26e25f2b19d342918f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb", "id": "2282340", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282340"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb\nWe should always check if skb_header_pointer's return is NULL before\nusing it, otherwise it may cause null-ptr-deref, as syzbot reported:\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nRIP: 0010:sctp_rcv_ootb net/sctp/input.c:705 [inline]\nRIP: 0010:sctp_rcv+0x1d84/0x3220 net/sctp/input.c:196\nCall Trace:\n<IRQ>\nsctp6_rcv+0x38/0x60 net/sctp/ipv6.c:1109\nip6_protocol_deliver_rcu+0x2e9/0x1ca0 net/ipv6/ip6_input.c:422\nip6_input_finish+0x62/0x170 net/ipv6/ip6_input.c:463\nNF_HOOK include/linux/netfilter.h:307 [inline]\nNF_HOOK include/linux/netfilter.h:301 [inline]\nip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472\ndst_input include/net/dst.h:460 [inline]\nip6_rcv_finish net/ipv6/ip6_input.c:76 [inline]\nNF_HOOK include/linux/netfilter.h:307 [inline]\nNF_HOOK include/linux/netfilter.h:301 [inline]\nipv6_rcv+0x28c/0x3c0 net/ipv6/ip6_input.c:297"], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47397", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47397\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47397\nhttps://lore.kernel.org/linux-cve-announce/2024052148-CVE-2021-47397-1b56@gregkh/T"], "statement": "This vulnerability is classified as moderate severity because the issue can cause system instability and crashes but does not expose data or allow remote code execution.", "threat_severity": "Moderate"}

{}