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.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/nfc/llcp_sock.c"
],
"versions": [
{
"version": "a1cdd18c49d2",
"lessThan": "26157c82ba75",
"status": "affected",
"versionType": "git"
},
{
"version": "18013007b596",
"lessThan": "ccddad6dd285",
"status": "affected",
"versionType": "git"
},
{
"version": "538a6ff11516",
"lessThan": "18ae4a192a44",
"status": "affected",
"versionType": "git"
},
{
"version": "adbb1d218c5f",
"lessThan": "48fba458fe54",
"status": "affected",
"versionType": "git"
},
{
"version": "c89903c9eff2",
"lessThan": "e32352070bca",
"status": "affected",
"versionType": "git"
},
{
"version": "6fb003e5ae18",
"lessThan": "6b7021ed36da",
"status": "affected",
"versionType": "git"
},
{
"version": "8c9e4971e142",
"lessThan": "374cdde4dcc9",
"status": "affected",
"versionType": "git"
},
{
"version": "c33b1cc62ac0",
"lessThan": "18175fe17ae0",
"status": "affected",
"versionType": "git"
},
{
"version": "c33b1cc62ac0",
"lessThan": "c61760e6940d",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/nfc/llcp_sock.c"
],
"versions": [
{
"version": "5.12",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.12",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.4.269",
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.9.269",
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.14.233",
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.191",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.119",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.37",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.11.21",
"lessThanOrEqual": "5.11.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.12.4",
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.13",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299
git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c
git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6
git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91
git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610
git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e
git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6
git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570
git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c