In the Linux kernel, the following vulnerability has been resolved:
scsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername()
Fix a NULL pointer crash that occurs when we are freeing the socket at the
same time we access it via sysfs.
The problem is that:
1. iscsi_sw_tcp_conn_get_param() and iscsi_sw_tcp_host_get_param() take
the frwd_lock and do sock_hold() then drop the frwd_lock. sock_hold()
does a get on the "struct sock".
2. iscsi_sw_tcp_release_conn() does sockfd_put() which does the last put
on the "struct socket" and that does __sock_release() which sets the
sock->ops to NULL.
3. iscsi_sw_tcp_conn_get_param() and iscsi_sw_tcp_host_get_param() then
call kernel_getpeername() which accesses the NULL sock->ops.
Above we do a get on the "struct sock", but we needed a get on the "struct
socket". Originally, we just held the frwd_lock the entire time but in
commit bcf3a2953d36 ("scsi: iscsi: iscsi_tcp: Avoid holding spinlock while
calling getpeername()") we switched to refcount based because the network
layer changed and started taking a mutex in that path, so we could no
longer hold the frwd_lock.
Instead of trying to maintain multiple refcounts, this just has us use a
mutex for accessing the socket in the interface code paths.
References
Configurations
Configuration 1 (hide)
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History
16 Jan 2026, 19:24
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/0a0b861fce2657ba08ec356a74346b37ca4b2008 - Patch | |
| References | () https://git.kernel.org/stable/c/57569c37f0add1b6489e1a1563c71519daf732cf - Patch | |
| References | () https://git.kernel.org/stable/c/884a788f065578bb640382279a83d1df433b13e6 - Patch | |
| References | () https://git.kernel.org/stable/c/897dbbc57d71e8a34ec1af8e573a142de457da38 - Patch | |
| References | () https://git.kernel.org/stable/c/a26b0658751bb0a3b28386fca715333b104d32a2 - Patch | |
| CWE | CWE-476 | |
| First Time |
Linux
Linux linux Kernel |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CPE | cpe:2.3:o:linux:linux_kernel:5.9:-:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.9:rc8:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
01 Oct 2025, 12:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-10-01 12:15
Updated : 2026-01-16 19:24
NVD link : CVE-2022-50459
Mitre link : CVE-2022-50459
CVE.ORG link : CVE-2022-50459
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference