CVSS 7.8 · High EPSS 0,23%
Kerentanan Use After Free pada linux kernel. Skor CVSS 3.1 7.8 (High) menurut NVD.
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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 4.4.267 hingga sebelum 4.4.269 |
| linux | linux kernel | Versi 4.9.267 hingga sebelum 4.9.269 |
| linux | linux kernel | Versi 4.14.231 hingga sebelum 4.14.233 |
| linux | linux kernel | Versi 4.19.187 hingga sebelum 4.19.191 |
| linux | linux kernel | Versi 5.4.112 hingga sebelum 5.4.119 |
| linux | linux kernel | Versi 5.10.30 hingga sebelum 5.10.37 |
| linux | linux kernel | Versi 5.11.14 hingga sebelum 5.11.21 |
| linux | linux kernel | Versi 5.12 hingga sebelum 5.12.4 |