CVE-2022-50459 (GCVE-0-2022-50459)
Vulnerability from cvelistv5
Published
2025-10-01 11:45
Modified
2025-10-01 11:45
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 Version: bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 Version: bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 Version: bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 Version: bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 Version: 7d29e950766327f658cb92722b9445ac3b3ae023 |
||||||
|
|||||||||
{
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"product": "Linux",
"programFiles": [
"drivers/scsi/iscsi_tcp.c",
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{
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"status": "unaffected",
"version": "6.0.3",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.1",
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}
]
}
],
"cpeApplicability": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername()\n\nFix a NULL pointer crash that occurs when we are freeing the socket at the\nsame time we access it via sysfs.\n\nThe problem is that:\n\n 1. iscsi_sw_tcp_conn_get_param() and iscsi_sw_tcp_host_get_param() take\n the frwd_lock and do sock_hold() then drop the frwd_lock. sock_hold()\n does a get on the \"struct sock\".\n\n 2. iscsi_sw_tcp_release_conn() does sockfd_put() which does the last put\n on the \"struct socket\" and that does __sock_release() which sets the\n sock-\u003eops to NULL.\n\n 3. iscsi_sw_tcp_conn_get_param() and iscsi_sw_tcp_host_get_param() then\n call kernel_getpeername() which accesses the NULL sock-\u003eops.\n\nAbove we do a get on the \"struct sock\", but we needed a get on the \"struct\nsocket\". Originally, we just held the frwd_lock the entire time but in\ncommit bcf3a2953d36 (\"scsi: iscsi: iscsi_tcp: Avoid holding spinlock while\ncalling getpeername()\") we switched to refcount based because the network\nlayer changed and started taking a mutex in that path, so we could no\nlonger hold the frwd_lock.\n\nInstead of trying to maintain multiple refcounts, this just has us use a\nmutex for accessing the socket in the interface code paths."
}
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"dateUpdated": "2025-10-01T11:45:31.740Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"url": "https://git.kernel.org/stable/c/884a788f065578bb640382279a83d1df433b13e6"
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{
"url": "https://git.kernel.org/stable/c/a26b0658751bb0a3b28386fca715333b104d32a2"
},
{
"url": "https://git.kernel.org/stable/c/897dbbc57d71e8a34ec1af8e573a142de457da38"
},
{
"url": "https://git.kernel.org/stable/c/0a0b861fce2657ba08ec356a74346b37ca4b2008"
},
{
"url": "https://git.kernel.org/stable/c/57569c37f0add1b6489e1a1563c71519daf732cf"
}
],
"title": "scsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername()",
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"cveId": "CVE-2022-50459",
"datePublished": "2025-10-01T11:45:31.740Z",
"dateReserved": "2025-10-01T11:38:45.640Z",
"dateUpdated": "2025-10-01T11:45:31.740Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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}