CVE-2021-47068
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
net/nfc: fix use-after-free llcp_sock_bind/connect
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| a1cdd18c49d23ec38097ac2c5b0d761146fc0109 | affected | git | 26157c82ba756767b2bd66d28a71b1bc454447f6 | Unavailable | None listed |
| 18013007b596771bf5f5e7feee9586fb0386ad14 | affected | git | ccddad6dd28530e716448e594c9ca7c76ccd0570 | Unavailable | None listed |
| 538a6ff11516d38a61e237d2d2dc04c30c845fbe | affected | git | 18ae4a192a4496e48a5490b52812645d2413307c | Unavailable | None listed |
| adbb1d218c5f56dbae052765da83c0f57fce2a31 | affected | git | 48fba458fe54cc2a980a05c13e6c19b8b2cfb610 | Unavailable | None listed |
| c89903c9eff219a4695e63715cf922748d743f65 | affected | git | e32352070bcac22be6ed8ab635debc280bb65b8c | Unavailable | None listed |
| 6fb003e5ae18d8cda4c8a1175d9dd8db12bec049 | affected | git | 6b7021ed36dabf29e56842e3408781cd3b82ef6e | Unavailable | None listed |
| 8c9e4971e142e2899606a2490b77a1208c1f4638 | affected | git | 374cdde4dcc9c909a60713abdbbf96d5e3e09f91 | Unavailable | None listed |
| c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d | affected | git | 18175fe17ae043a0b81e5d511f8817825784c299 | Unavailable | None listed |
| c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d | affected | git | c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6 | Unavailable | None listed |
| 4.4.267 | affected | semver | 4.4.269 | Unavailable | None listed |
| 4.9.267 | affected | semver | 4.9.269 | Unavailable | None listed |
| 4.14.231 | affected | semver | 4.14.233 | Unavailable | None listed |
| 4.19.187 | affected | semver | 4.19.191 | Unavailable | None listed |
| 5.4.112 | affected | semver | 5.4.119 | Unavailable | None listed |
| 5.10.30 | affected | semver | 5.10.37 | Unavailable | None listed |
| 5.11.14 | affected | semver | 5.11.21 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 5.12 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.12 | Unavailable | None listed |
| 4.4.269 | unaffected | semver | Unavailable | 4.4.* | None listed |
| 4.9.269 | unaffected | semver | Unavailable | 4.9.* | None listed |
| 4.14.233 | unaffected | semver | Unavailable | 4.14.* | None listed |
| 4.19.191 | unaffected | semver | Unavailable | 4.19.* | None listed |
| 5.4.119 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.37 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.11.21 | unaffected | semver | Unavailable | 5.11.* | None listed |
| 5.12.4 | unaffected | semver | Unavailable | 5.12.* | None listed |
| 5.13 | unaffected | original_commit_for_fix | Unavailable | * | None listed |