FKIE_CVE-2022-50459

Vulnerability from fkie_nvd - Published: 2025-10-01 12:15 - Updated: 2026-01-16 19:24
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a0b861fce2657ba08ec356a74346b37ca4b2008Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57569c37f0add1b6489e1a1563c71519daf732cfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/884a788f065578bb640382279a83d1df433b13e6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/897dbbc57d71e8a34ec1af8e573a142de457da38Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a26b0658751bb0a3b28386fca715333b104d32a2Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.9
linux linux_kernel 5.9
To clipboard 

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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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  "id": "CVE-2022-50459",
  "lastModified": "2026-01-16T19:24:44.347",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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