In the Linux kernel, the following vulnerability has been resolved:
mptcp: clear 'kern' flag from fallback sockets
The mptcp ULP extension relies on sk->sk_sock_kern being set correctly:
It prevents setsockopt(fd, IPPROTO_TCP, TCP_ULP, "mptcp", 6); from
working for plain tcp sockets (any userspace-exposed socket).
But in case of fallback, accept() can return a plain tcp sk.
In such case, sk is still tagged as 'kernel' and setsockopt will work.
This will crash the kernel, The subflow extension has a NULL ctx->conn
mptcp socket:
BUG: KASAN: null-ptr-deref in subflow_data_ready+0x181/0x2b0
Call Trace:
tcp_data_ready+0xf8/0x370
[..]
References
Configurations
Configuration 1 (hide)
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History
01 Nov 2024, 15:15
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/c26ac0ea3a91c210cf90452e625dc441adf3e549 - Patch | |
| References | () https://git.kernel.org/stable/c/d6692b3b97bdc165d150f4c1505751a323a80717 - Patch | |
| References | () https://git.kernel.org/stable/c/451f1eded7f56e93aaf52eb547ba97742d9c0e97 - Patch | |
| First Time |
Linux
Linux linux Kernel |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CPE | cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:* |
|
| CWE | CWE-476 |
19 Jun 2024, 15:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2024-06-19 15:15
Updated : 2024-11-01 15:15
NVD link : CVE-2021-47593
Mitre link : CVE-2021-47593
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference