Vulnerability Details : CVE-2021-47115
In the Linux kernel, the following vulnerability has been resolved:
nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect
It's possible to trigger NULL pointer dereference by local unprivileged
user, when calling getsockname() after failed bind() (e.g. the bind
fails because LLCP_SAP_MAX used as SAP):
BUG: kernel NULL pointer dereference, address: 0000000000000000
CPU: 1 PID: 426 Comm: llcp_sock_getna Not tainted 5.13.0-rc2-next-20210521+ #9
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1 04/01/2014
Call Trace:
llcp_sock_getname+0xb1/0xe0
__sys_getpeername+0x95/0xc0
? lockdep_hardirqs_on_prepare+0xd5/0x180
? syscall_enter_from_user_mode+0x1c/0x40
__x64_sys_getpeername+0x11/0x20
do_syscall_64+0x36/0x70
entry_SYSCALL_64_after_hwframe+0x44/0xae
This can be reproduced with Syzkaller C repro (bind followed by
getpeername):
https://syzkaller.appspot.com/x/repro.c?x=14def446e00000
Vulnerability category: Memory Corruption
Products affected by CVE-2021-47115
Please log in to view affected product information.
Exploit prediction scoring system (EPSS) score for CVE-2021-47115
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 7 %
Percentile, the proportion of vulnerabilities that are scored at or less
References for CVE-2021-47115
-
https://git.kernel.org/stable/c/48ee0db61c8299022ec88c79ad137f290196cac2
nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/eb6875d48590d8e564092e831ff07fa384d7e477
nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/93e4ac2a9979a9a4ecc158409ed9c3044dc0ae1f
nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/39c15bd2e5d11bcf7f4c3dba2aad9e1e110a5d94
nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/ffff05b9ee5c74c04bba2801c1f99b31975d74d9
nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/5d4c4b06ed9fb7a69d0b2e2a73fc73226d25ab70
nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/0c4559736d9a4ec1ca58ba98ca34e7c4da4c422b
nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/4ac06a1e013cf5fdd963317ffd3b968560f33bba
nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect - kernel/git/stable/linux.git - Linux kernel stable tree
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