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.
References
Configurations
Configuration 1 (hide)
|
History
10 Dec 2024, 19:50
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| First Time |
Linux linux Kernel
Linux |
|
| References | () https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299 - Patch | |
| References | () https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c - Patch | |
| References | () https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6 - Patch | |
| References | () https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91 - Patch | |
| References | () https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610 - Patch | |
| References | () https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e - Patch | |
| References | () https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6 - Patch | |
| References | () https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570 - Patch | |
| References | () https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c - Patch | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
| CWE | CWE-416 |
Information
Published : 2024-02-29 23:15
Updated : 2025-04-22 16:15
NVD link : CVE-2021-47068
Mitre link : CVE-2021-47068
CVE.ORG link : CVE-2021-47068
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-416
Use After Free