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 |
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2021-47068",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-04-22T15:46:55.659814Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-04-22T15:47:46.766Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2024-08-04T05:24:39.447Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/nfc/llcp_sock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "26157c82ba756767b2bd66d28a71b1bc454447f6",
"status": "affected",
"version": "a1cdd18c49d23ec38097ac2c5b0d761146fc0109",
"versionType": "git"
},
{
"lessThan": "ccddad6dd28530e716448e594c9ca7c76ccd0570",
"status": "affected",
"version": "18013007b596771bf5f5e7feee9586fb0386ad14",
"versionType": "git"
},
{
"lessThan": "18ae4a192a4496e48a5490b52812645d2413307c",
"status": "affected",
"version": "538a6ff11516d38a61e237d2d2dc04c30c845fbe",
"versionType": "git"
},
{
"lessThan": "48fba458fe54cc2a980a05c13e6c19b8b2cfb610",
"status": "affected",
"version": "adbb1d218c5f56dbae052765da83c0f57fce2a31",
"versionType": "git"
},
{
"lessThan": "e32352070bcac22be6ed8ab635debc280bb65b8c",
"status": "affected",
"version": "c89903c9eff219a4695e63715cf922748d743f65",
"versionType": "git"
},
{
"lessThan": "6b7021ed36dabf29e56842e3408781cd3b82ef6e",
"status": "affected",
"version": "6fb003e5ae18d8cda4c8a1175d9dd8db12bec049",
"versionType": "git"
},
{
"lessThan": "374cdde4dcc9c909a60713abdbbf96d5e3e09f91",
"status": "affected",
"version": "8c9e4971e142e2899606a2490b77a1208c1f4638",
"versionType": "git"
},
{
"lessThan": "18175fe17ae043a0b81e5d511f8817825784c299",
"status": "affected",
"version": "c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d",
"versionType": "git"
},
{
"lessThan": "c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6",
"status": "affected",
"version": "c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d",
"versionType": "git"
},
{
"lessThan": "4.4.269",
"status": "affected",
"version": "4.4.267",
"versionType": "semver"
},
{
"lessThan": "4.9.269",
"status": "affected",
"version": "4.9.267",
"versionType": "semver"
},
{
"lessThan": "4.14.233",
"status": "affected",
"version": "4.14.231",
"versionType": "semver"
},
{
"lessThan": "4.19.191",
"status": "affected",
"version": "4.19.187",
"versionType": "semver"
},
{
"lessThan": "5.4.119",
"status": "affected",
"version": "5.4.112",
"versionType": "semver"
},
{
"lessThan": "5.10.37",
"status": "affected",
"version": "5.10.30",
"versionType": "semver"
},
{
"lessThan": "5.11.21",
"status": "affected",
"version": "5.11.14",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/nfc/llcp_sock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.12"
},
{
"lessThan": "5.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.269",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.269",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.233",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.119",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.37",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.11.*",
"status": "unaffected",
"version": "5.11.21",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.13",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.4.269",
"versionStartIncluding": "4.4.267",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.9.269",
"versionStartIncluding": "4.9.267",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.14.233",
"versionStartIncluding": "4.14.231",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.19.191",
"versionStartIncluding": "4.19.187",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.119",
"versionStartIncluding": "5.4.112",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.37",
"versionStartIncluding": "5.10.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.11.21",
"versionStartIncluding": "5.11.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.12.4",
"versionStartIncluding": "5.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.13",
"versionStartIncluding": "5.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is reached via local AF_NFC SOCK_STREAM socket/bind/close syscalls on the LLCP path, not by processing NFC frames from a peer; an NFC device must exist but the trigger itself is local userspace.\nAC:L - The PoC is deterministic with no race: two binds that fail after assigning the shared local, then close, reliably free and re-use the object under full attacker control of both sockets and timing for heap spray.\nPR:L - SOCK_STREAM/DGRAM LLCP sockets require no capabilities (only SOCK_RAW checks CAP_NET_RAW); an unprivileged local user can trigger this on a system with an NFC device (e.g., Android/phone), matching the researchers\u0027 unprivileged LPE claim.\nUI:N - The attacker runs their own program to create sockets, bind, and close; no victim interaction is required.\nS:U - This is a standard in-kernel UAF privilege escalation within the host kernel\u0027s security authority, not a VM/IOMMU/sandbox boundary crossing.\nC:H - Use-after-free of the heap-allocated nfc_llcp_local object enables reclaim and arbitrary read primitives, supporting full confidentiality impact and privilege escalation.\nI:H - The same UAF provides a write primitive via controlled reclaim of the freed local object, enabling corruption/control-flow hijacking and privilege escalation as reported.\nA:H - The UAF causes refcount underflow, kernel warnings/oops, and crash on misuse of the freed local, so availability impact is high even without a full exploit."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T08:45:49.592Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
],
"title": "net/nfc: fix use-after-free llcp_sock_bind/connect",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47068",
"datePublished": "2024-02-29T22:37:41.736Z",
"dateReserved": "2024-02-29T22:33:44.296Z",
"dateUpdated": "2026-08-05T08:45:49.592Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2021-47068",
"date": "2026-09-24",
"epss": "0.00233",
"percentile": "0.12564"
},
"fkie_nvd": {
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "3F56FA3D-5B9E-455D-BA98-AAD5E4B15FDB",
"versionEndExcluding": "4.4.269",
"versionStartIncluding": "4.4.267",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "B10FBDD9-624C-4294-AB93-D37D5CC2A04B",
"versionEndExcluding": "4.9.269",
"versionStartIncluding": "4.9.267",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "60A4360B-1370-4097-A160-B99742C3235F",
"versionEndExcluding": "4.14.233",
"versionStartIncluding": "4.14.231",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "884C2D43-91AB-4AB0-88F9-2DB0A7208D3B",
"versionEndExcluding": "4.19.191",
"versionStartIncluding": "4.19.187",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "0A06D523-CBB3-4DF4-BCF1-5508C3DB89D9",
"versionEndExcluding": "5.4.119",
"versionStartIncluding": "5.4.112",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "2D7B8DC6-CB38-4A86-8EC5-C0803B42FC8A",
"versionEndExcluding": "5.10.37",
"versionStartIncluding": "5.10.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D0E4DE1B-ADA6-4853-BFAB-67C97C59255F",
"versionEndExcluding": "5.11.21",
"versionStartIncluding": "5.11.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D8C7052F-1B7B-4327-9C2B-84EBF3243838",
"versionEndExcluding": "5.12.4",
"versionStartIncluding": "5.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2024-02-29T23:15:08.170",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"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": "af854a3a-2127-422b-91ae-364da2661108",
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/nfc/llcp_sock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "26157c82ba756767b2bd66d28a71b1bc454447f6",
"status": "affected",
"version": "a1cdd18c49d23ec38097ac2c5b0d761146fc0109",
"versionType": "git"
},
{
"lessThan": "ccddad6dd28530e716448e594c9ca7c76ccd0570",
"status": "affected",
"version": "18013007b596771bf5f5e7feee9586fb0386ad14",
"versionType": "git"
},
{
"lessThan": "18ae4a192a4496e48a5490b52812645d2413307c",
"status": "affected",
"version": "538a6ff11516d38a61e237d2d2dc04c30c845fbe",
"versionType": "git"
},
{
"lessThan": "48fba458fe54cc2a980a05c13e6c19b8b2cfb610",
"status": "affected",
"version": "adbb1d218c5f56dbae052765da83c0f57fce2a31",
"versionType": "git"
},
{
"lessThan": "e32352070bcac22be6ed8ab635debc280bb65b8c",
"status": "affected",
"version": "c89903c9eff219a4695e63715cf922748d743f65",
"versionType": "git"
},
{
"lessThan": "6b7021ed36dabf29e56842e3408781cd3b82ef6e",
"status": "affected",
"version": "6fb003e5ae18d8cda4c8a1175d9dd8db12bec049",
"versionType": "git"
},
{
"lessThan": "374cdde4dcc9c909a60713abdbbf96d5e3e09f91",
"status": "affected",
"version": "8c9e4971e142e2899606a2490b77a1208c1f4638",
"versionType": "git"
},
{
"lessThan": "18175fe17ae043a0b81e5d511f8817825784c299",
"status": "affected",
"version": "c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d",
"versionType": "git"
},
{
"lessThan": "c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6",
"status": "affected",
"version": "c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d",
"versionType": "git"
},
{
"lessThan": "4.4.269",
"status": "affected",
"version": "4.4.267",
"versionType": "semver"
},
{
"lessThan": "4.9.269",
"status": "affected",
"version": "4.9.267",
"versionType": "semver"
},
{
"lessThan": "4.14.233",
"status": "affected",
"version": "4.14.231",
"versionType": "semver"
},
{
"lessThan": "4.19.191",
"status": "affected",
"version": "4.19.187",
"versionType": "semver"
},
{
"lessThan": "5.4.119",
"status": "affected",
"version": "5.4.112",
"versionType": "semver"
},
{
"lessThan": "5.10.37",
"status": "affected",
"version": "5.10.30",
"versionType": "semver"
},
{
"lessThan": "5.11.21",
"status": "affected",
"version": "5.11.14",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/nfc/llcp_sock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.12"
},
{
"lessThan": "5.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.269",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.269",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.233",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.119",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.37",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.11.*",
"status": "unaffected",
"version": "5.11.21",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.13",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "3F56FA3D-5B9E-455D-BA98-AAD5E4B15FDB",
"versionEndExcluding": "4.4.269",
"versionStartIncluding": "4.4.267",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "B10FBDD9-624C-4294-AB93-D37D5CC2A04B",
"versionEndExcluding": "4.9.269",
"versionStartIncluding": "4.9.267",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "60A4360B-1370-4097-A160-B99742C3235F",
"versionEndExcluding": "4.14.233",
"versionStartIncluding": "4.14.231",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "884C2D43-91AB-4AB0-88F9-2DB0A7208D3B",
"versionEndExcluding": "4.19.191",
"versionStartIncluding": "4.19.187",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "0A06D523-CBB3-4DF4-BCF1-5508C3DB89D9",
"versionEndExcluding": "5.4.119",
"versionStartIncluding": "5.4.112",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "2D7B8DC6-CB38-4A86-8EC5-C0803B42FC8A",
"versionEndExcluding": "5.10.37",
"versionStartIncluding": "5.10.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D0E4DE1B-ADA6-4853-BFAB-67C97C59255F",
"versionEndExcluding": "5.11.21",
"versionStartIncluding": "5.11.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D8C7052F-1B7B-4327-9C2B-84EBF3243838",
"versionEndExcluding": "5.12.4",
"versionStartIncluding": "5.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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."
}
],
"id": "CVE-2021-47068",
"lastModified": "2026-06-17T04:16:22.493",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-47068",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-04-22T15:46:55.659814Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-02-29T23:15:08.170",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"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": "af854a3a-2127-422b-91ae-364da2661108",
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2025-11-21T14:16:21+00:00",
"cve": "CVE-2021-47068",
"id": "CVE-2021-47068",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:known_affected": "42",
"product_status:known_not_affected": "156",
"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"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-08-31T01:58:22Z",
"cve": "CVE-2021-47068",
"id": "CVE-2021-47068",
"initial_release_date": "2024-03-02T05:48:50Z",
"product_status:known_not_affected": "352",
"product_status:recommended": "229",
"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"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T05:24:39.447Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2021-47068",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-04-22T15:46:55.659814Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-05-23T19:01:16.061Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/nfc/llcp_sock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "26157c82ba756767b2bd66d28a71b1bc454447f6",
"status": "affected",
"version": "a1cdd18c49d23ec38097ac2c5b0d761146fc0109",
"versionType": "git"
},
{
"lessThan": "ccddad6dd28530e716448e594c9ca7c76ccd0570",
"status": "affected",
"version": "18013007b596771bf5f5e7feee9586fb0386ad14",
"versionType": "git"
},
{
"lessThan": "18ae4a192a4496e48a5490b52812645d2413307c",
"status": "affected",
"version": "538a6ff11516d38a61e237d2d2dc04c30c845fbe",
"versionType": "git"
},
{
"lessThan": "48fba458fe54cc2a980a05c13e6c19b8b2cfb610",
"status": "affected",
"version": "adbb1d218c5f56dbae052765da83c0f57fce2a31",
"versionType": "git"
},
{
"lessThan": "e32352070bcac22be6ed8ab635debc280bb65b8c",
"status": "affected",
"version": "c89903c9eff219a4695e63715cf922748d743f65",
"versionType": "git"
},
{
"lessThan": "6b7021ed36dabf29e56842e3408781cd3b82ef6e",
"status": "affected",
"version": "6fb003e5ae18d8cda4c8a1175d9dd8db12bec049",
"versionType": "git"
},
{
"lessThan": "374cdde4dcc9c909a60713abdbbf96d5e3e09f91",
"status": "affected",
"version": "8c9e4971e142e2899606a2490b77a1208c1f4638",
"versionType": "git"
},
{
"lessThan": "18175fe17ae043a0b81e5d511f8817825784c299",
"status": "affected",
"version": "c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d",
"versionType": "git"
},
{
"lessThan": "c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6",
"status": "affected",
"version": "c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d",
"versionType": "git"
},
{
"lessThan": "4.4.269",
"status": "affected",
"version": "4.4.267",
"versionType": "semver"
},
{
"lessThan": "4.9.269",
"status": "affected",
"version": "4.9.267",
"versionType": "semver"
},
{
"lessThan": "4.14.233",
"status": "affected",
"version": "4.14.231",
"versionType": "semver"
},
{
"lessThan": "4.19.191",
"status": "affected",
"version": "4.19.187",
"versionType": "semver"
},
{
"lessThan": "5.4.119",
"status": "affected",
"version": "5.4.112",
"versionType": "semver"
},
{
"lessThan": "5.10.37",
"status": "affected",
"version": "5.10.30",
"versionType": "semver"
},
{
"lessThan": "5.11.21",
"status": "affected",
"version": "5.11.14",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/nfc/llcp_sock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.12"
},
{
"lessThan": "5.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.269",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.269",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.233",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.119",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.37",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.11.*",
"status": "unaffected",
"version": "5.11.21",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.13",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.4.269",
"versionStartIncluding": "4.4.267",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.9.269",
"versionStartIncluding": "4.9.267",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.14.233",
"versionStartIncluding": "4.14.231",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.19.191",
"versionStartIncluding": "4.19.187",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.119",
"versionStartIncluding": "5.4.112",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.37",
"versionStartIncluding": "5.10.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.11.21",
"versionStartIncluding": "5.11.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.12.4",
"versionStartIncluding": "5.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.13",
"versionStartIncluding": "5.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is reached via local AF_NFC SOCK_STREAM socket/bind/close syscalls on the LLCP path, not by processing NFC frames from a peer; an NFC device must exist but the trigger itself is local userspace.\nAC:L - The PoC is deterministic with no race: two binds that fail after assigning the shared local, then close, reliably free and re-use the object under full attacker control of both sockets and timing for heap spray.\nPR:L - SOCK_STREAM/DGRAM LLCP sockets require no capabilities (only SOCK_RAW checks CAP_NET_RAW); an unprivileged local user can trigger this on a system with an NFC device (e.g., Android/phone), matching the researchers\u0027 unprivileged LPE claim.\nUI:N - The attacker runs their own program to create sockets, bind, and close; no victim interaction is required.\nS:U - This is a standard in-kernel UAF privilege escalation within the host kernel\u0027s security authority, not a VM/IOMMU/sandbox boundary crossing.\nC:H - Use-after-free of the heap-allocated nfc_llcp_local object enables reclaim and arbitrary read primitives, supporting full confidentiality impact and privilege escalation.\nI:H - The same UAF provides a write primitive via controlled reclaim of the freed local object, enabling corruption/control-flow hijacking and privilege escalation as reported.\nA:H - The UAF causes refcount underflow, kernel warnings/oops, and crash on misuse of the freed local, so availability impact is high even without a full exploit."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T08:45:49.592Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
],
"title": "net/nfc: fix use-after-free llcp_sock_bind/connect",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47068",
"datePublished": "2024-02-29T22:37:41.736Z",
"dateReserved": "2024-02-29T22:33:44.296Z",
"dateUpdated": "2026-08-05T08:45:49.592Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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.
Loading…
Loading…
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…