CVE-2021-47068 (GCVE-0-2021-47068)
Vulnerability from cvelistv5 – Published: 2024-02-29 22:37 – Updated: 2026-08-05 08:45
VLAI
EPSS
VEX
Title
net/nfc: fix use-after-free llcp_sock_bind/connect
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/nfc: fix use-after-free llcp_sock_bind/connect
Commits 8a4cd82d ("nfc: fix refcount leak in llcp_sock_connect()")
and c33b1cc62 ("nfc: fix refcount leak in llcp_sock_bind()")
fixed a refcount leak bug in bind/connect but introduced a
use-after-free if the same local is assigned to 2 different sockets.
This can be triggered by the following simple program:
int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );
int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );
memset( &addr, 0, sizeof(struct sockaddr_nfc_llcp) );
addr.sa_family = AF_NFC;
addr.nfc_protocol = NFC_PROTO_NFC_DEP;
bind( sock1, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) )
bind( sock2, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) )
close(sock1);
close(sock2);
Fix this by assigning NULL to llcp_sock->local after calling
nfc_llcp_local_put.
This addresses CVE-2021-23134.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-22 15:46 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
a1cdd18c49d23ec38097ac2c5b0d761146fc0109 , < 26157c82ba756767b2bd66d28a71b1bc454447f6
(git)
Affected: 18013007b596771bf5f5e7feee9586fb0386ad14 , < ccddad6dd28530e716448e594c9ca7c76ccd0570 (git) Affected: 538a6ff11516d38a61e237d2d2dc04c30c845fbe , < 18ae4a192a4496e48a5490b52812645d2413307c (git) Affected: adbb1d218c5f56dbae052765da83c0f57fce2a31 , < 48fba458fe54cc2a980a05c13e6c19b8b2cfb610 (git) Affected: c89903c9eff219a4695e63715cf922748d743f65 , < e32352070bcac22be6ed8ab635debc280bb65b8c (git) Affected: 6fb003e5ae18d8cda4c8a1175d9dd8db12bec049 , < 6b7021ed36dabf29e56842e3408781cd3b82ef6e (git) Affected: 8c9e4971e142e2899606a2490b77a1208c1f4638 , < 374cdde4dcc9c909a60713abdbbf96d5e3e09f91 (git) Affected: c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d , < 18175fe17ae043a0b81e5d511f8817825784c299 (git) Affected: c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d , < c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6 (git) Affected: 4.4.267 , < 4.4.269 (semver) Affected: 4.9.267 , < 4.9.269 (semver) Affected: 4.14.231 , < 4.14.233 (semver) Affected: 4.19.187 , < 4.19.191 (semver) Affected: 5.4.112 , < 5.4.119 (semver) Affected: 5.10.30 , < 5.10.37 (semver) Affected: 5.11.14 , < 5.11.21 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.12
Unaffected: 0 , < 5.12 (semver) Unaffected: 4.4.269 , ≤ 4.4.* (semver) Unaffected: 4.9.269 , ≤ 4.9.* (semver) Unaffected: 4.14.233 , ≤ 4.14.* (semver) Unaffected: 4.19.191 , ≤ 4.19.* (semver) Unaffected: 5.4.119 , ≤ 5.4.* (semver) Unaffected: 5.10.37 , ≤ 5.10.* (semver) Unaffected: 5.11.21 , ≤ 5.11.* (semver) Unaffected: 5.12.4 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix) |
guessed |
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"descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/nfc: fix use-after-free llcp_sock_bind/connect\\n\\nCommits 8a4cd82d (\\\"nfc: fix refcount leak in llcp_sock_connect()\\\")\\nand c33b1cc62 (\\\"nfc: fix refcount leak in llcp_sock_bind()\\\")\\nfixed a refcount leak bug in bind/connect but introduced a\\nuse-after-free if the same local is assigned to 2 different sockets.\\n\\nThis can be triggered by the following simple program:\\n int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\\n int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\\n memset( \u0026addr, 0, sizeof(struct sockaddr_nfc_llcp) );\\n addr.sa_family = AF_NFC;\\n addr.nfc_protocol = NFC_PROTO_NFC_DEP;\\n bind( sock1, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\\n bind( sock2, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\\n close(sock1);\\n close(sock2);\\n\\nFix this by assigning NULL to llcp_sock-\u003elocal after calling\\nnfc_llcp_local_put.\\n\\nThis addresses CVE-2021-23134.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/nfc: corrige use-after-free llcp_sock_bind/connect Commits 8a4cd82d (\\\"nfc: corrige la fuga de refcount en llcp_sock_connect()\\\") y c33b1cc62 (\\\"nfc: corrige la fuga de refcount en llcp_sock_bind()\\\") corrigi\\u00f3 un error de fuga de recuento en bind/connect pero introdujo un Use-After-Free si el mismo local est\\u00e1 asignado a 2 sockets diferentes. Esto puede activarse mediante el siguiente programa simple: int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP ); int sock2 = conector (AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP); memset( \u0026amp;addr, 0, sizeof(struct sockaddr_nfc_llcp) ); addr.sa_family = AF_NFC; addr.nfc_protocol = NFC_PROTO_NFC_DEP; bind( sock1, (struct sockaddr*) \u0026amp; addr, sizeof(struct sockaddr_nfc_llcp) ) bind( sock2, (struct sockaddr*) \u0026amp; addr, sizeof(struct sockaddr_nfc_llcp) ) close(sock1); cerrar(calcet\\u00edn2); Solucione este problema asignando NULL a llcp_sock-\u0026gt;local despu\\u00e9s de llamar a nfc_llcp_local_put. Esto aborda CVE-2021-23134.\"}]",
"id": "CVE-2021-47068",
"lastModified": "2024-12-10T19:50:49.147",
"metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.9}]}",
"published": "2024-02-29T23:15:08.170",
"references": "[{\"url\": \"https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}]",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2021-47068\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-29T23:15:08.170\",\"lastModified\":\"2026-06-17T04:16:22.493\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/nfc: fix use-after-free llcp_sock_bind/connect\\n\\nCommits 8a4cd82d (\\\"nfc: fix refcount leak in llcp_sock_connect()\\\")\\nand c33b1cc62 (\\\"nfc: fix refcount leak in llcp_sock_bind()\\\")\\nfixed a refcount leak bug in bind/connect but introduced a\\nuse-after-free if the same local is assigned to 2 different sockets.\\n\\nThis can be triggered by the following simple program:\\n int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\\n int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\\n memset( \u0026addr, 0, sizeof(struct sockaddr_nfc_llcp) );\\n addr.sa_family = AF_NFC;\\n addr.nfc_protocol = NFC_PROTO_NFC_DEP;\\n bind( sock1, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\\n bind( sock2, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\\n close(sock1);\\n close(sock2);\\n\\nFix this by assigning NULL to llcp_sock-\u003elocal after calling\\nnfc_llcp_local_put.\\n\\nThis addresses CVE-2021-23134.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/nfc: corrige use-after-free llcp_sock_bind/connect Commits 8a4cd82d (\\\"nfc: corrige la fuga de refcount en llcp_sock_connect()\\\") y c33b1cc62 (\\\"nfc: corrige la fuga de refcount en llcp_sock_bind()\\\") corrigi\u00f3 un error de fuga de recuento en bind/connect pero introdujo un Use-After-Free si el mismo local est\u00e1 asignado a 2 sockets diferentes. Esto puede activarse mediante el siguiente programa simple: int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP ); int sock2 = conector (AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP); memset( \u0026amp;addr, 0, sizeof(struct sockaddr_nfc_llcp) ); addr.sa_family = AF_NFC; addr.nfc_protocol = NFC_PROTO_NFC_DEP; bind( sock1, (struct sockaddr*) \u0026amp; addr, sizeof(struct sockaddr_nfc_llcp) ) bind( sock2, (struct sockaddr*) \u0026amp; addr, sizeof(struct sockaddr_nfc_llcp) ) close(sock1); cerrar(calcet\u00edn2); Solucione este problema asignando NULL a llcp_sock-\u0026gt;local despu\u00e9s de llamar a nfc_llcp_local_put. Esto aborda CVE-2021-23134.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/nfc/llcp_sock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a1cdd18c49d23ec38097ac2c5b0d761146fc0109\",\"lessThan\":\"26157c82ba756767b2bd66d28a71b1bc454447f6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"18013007b596771bf5f5e7feee9586fb0386ad14\",\"lessThan\":\"ccddad6dd28530e716448e594c9ca7c76ccd0570\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"538a6ff11516d38a61e237d2d2dc04c30c845fbe\",\"lessThan\":\"18ae4a192a4496e48a5490b52812645d2413307c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"adbb1d218c5f56dbae052765da83c0f57fce2a31\",\"lessThan\":\"48fba458fe54cc2a980a05c13e6c19b8b2cfb610\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c89903c9eff219a4695e63715cf922748d743f65\",\"lessThan\":\"e32352070bcac22be6ed8ab635debc280bb65b8c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6fb003e5ae18d8cda4c8a1175d9dd8db12bec049\",\"lessThan\":\"6b7021ed36dabf29e56842e3408781cd3b82ef6e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8c9e4971e142e2899606a2490b77a1208c1f4638\",\"lessThan\":\"374cdde4dcc9c909a60713abdbbf96d5e3e09f91\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d\",\"lessThan\":\"18175fe17ae043a0b81e5d511f8817825784c299\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d\",\"lessThan\":\"c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4.4.267\",\"lessThan\":\"4.4.269\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.9.267\",\"lessThan\":\"4.9.269\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.14.231\",\"lessThan\":\"4.14.233\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.19.187\",\"lessThan\":\"4.19.191\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.112\",\"lessThan\":\"5.4.119\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.10.30\",\"lessThan\":\"5.10.37\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.11.14\",\"lessThan\":\"5.11.21\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/nfc/llcp_sock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.4.269\",\"lessThanOrEqual\":\"4.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.9.269\",\"lessThanOrEqual\":\"4.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.233\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.191\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.119\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.37\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.11.21\",\"lessThanOrEqual\":\"5.11.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.12.4\",\"lessThanOrEqual\":\"5.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.13\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-04-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"cve": "CVE-2021-47068",
"id": "CVE-2021-47068",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:known_affected": "42",
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net/nfc: fix use-after-free llcp_sock_bind/connect",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47068.json",
"version": "3"
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"initial_release_date": "2024-03-02T05:48:50Z",
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"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-47068",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47068.json",
"version": "44"
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[{\"status\": \"affected\", \"version\": \"5.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.4.269\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.269\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.233\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.191\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.119\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.37\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/nfc/llcp_sock.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6\"}, {\"url\": \"https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570\"}, {\"url\": \"https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c\"}, {\"url\": \"https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610\"}, {\"url\": \"https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c\"}, {\"url\": \"https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e\"}, {\"url\": \"https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91\"}, {\"url\": \"https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299\"}, {\"url\": \"https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/nfc: fix use-after-free llcp_sock_bind/connect\\n\\nCommits 8a4cd82d (\\\"nfc: fix refcount leak in llcp_sock_connect()\\\")\\nand c33b1cc62 (\\\"nfc: fix refcount leak in llcp_sock_bind()\\\")\\nfixed a refcount leak bug in bind/connect but introduced a\\nuse-after-free if the same local is assigned to 2 different sockets.\\n\\nThis can be triggered by the following simple program:\\n int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\\n int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\\n memset( \u0026addr, 0, sizeof(struct sockaddr_nfc_llcp) );\\n addr.sa_family = AF_NFC;\\n addr.nfc_protocol = NFC_PROTO_NFC_DEP;\\n bind( sock1, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\\n bind( sock2, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\\n close(sock1);\\n close(sock2);\\n\\nFix this by assigning NULL to llcp_sock-\u003elocal after calling\\nnfc_llcp_local_put.\\n\\nThis addresses CVE-2021-23134.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.269\", \"versionStartIncluding\": \"4.4.267\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.269\", \"versionStartIncluding\": \"4.9.267\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.233\", \"versionStartIncluding\": \"4.14.231\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.191\", \"versionStartIncluding\": \"4.19.187\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.119\", \"versionStartIncluding\": \"5.4.112\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.37\", \"versionStartIncluding\": \"5.10.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.21\", \"versionStartIncluding\": \"5.11.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.4\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:45:49.592Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-47068\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:45:49.592Z\", \"dateReserved\": \"2024-02-29T22:33:44.296Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-29T22:37:41.736Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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