Bug 2426090 (CVE-2023-54184) - CVE-2023-54184 kernel: scsi: target: iscsit: Free cmds before session free
Summary: CVE-2023-54184 kernel: scsi: target: iscsit: Free cmds before session free
Keywords:
Status: NEW
Alias: CVE-2023-54184
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-12-30 13:08 UTC by OSIDB Bzimport
Modified: 2025-12-31 10:05 UTC (History)
0 users

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Description OSIDB Bzimport 2025-12-30 13:08:16 UTC 
In the Linux kernel, the following vulnerability has been resolved:

scsi: target: iscsit: Free cmds before session free

Commands from recovery entries are freed after session has been closed.
That leads to use-after-free at command free or NPE with such call trace:

Time2Retain timer expired for SID: 1, cleaning up iSCSI session.
BUG: kernel NULL pointer dereference, address: 0000000000000140
RIP: 0010:sbitmap_queue_clear+0x3a/0xa0
Call Trace:
 target_release_cmd_kref+0xd1/0x1f0 [target_core_mod]
 transport_generic_free_cmd+0xd1/0x180 [target_core_mod]
 iscsit_free_cmd+0x53/0xd0 [iscsi_target_mod]
 iscsit_free_connection_recovery_entries+0x29d/0x320 [iscsi_target_mod]
 iscsit_close_session+0x13a/0x140 [iscsi_target_mod]
 iscsit_check_post_dataout+0x440/0x440 [iscsi_target_mod]
 call_timer_fn+0x24/0x140

Move cleanup of recovery enrties to before session freeing.
Comment 1 Alexander B 2025-12-31 10:02:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025123025-CVE-2023-54184-e958@gregkh/T
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