CVE-2025-38700

scsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated

State: Published
Severity: Not scored
Published: Sep 4, 2025
Updated: May 12, 2026
Reserved: Apr 16, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

scsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated

In case of an ib_fast_reg_mr allocation failure during iSER setup, the machine hits a panic because iscsi_conn->dd_data is initialized unconditionally, even when no memory is allocated (dd_size == 0). This leads invalid pointer dereference during connection teardown.

Fix by setting iscsi_conn->dd_data only if memory is actually allocated.

Panic trace: ------------ iser: iser_create_fastreg_desc: Failed to allocate ib_fast_reg_mr err=-12 iser: iser_alloc_rx_descriptors: failed allocating rx descriptors / data buffers BUG: unable to handle page fault for address: fffffffffffffff8 RIP: 0010:swake_up_locked.part.5+0xa/0x40 Call Trace: complete+0x31/0x40 iscsi_iser_conn_stop+0x88/0xb0 [ib_iser] iscsi_stop_conn+0x66/0xc0 [scsi_transport_iscsi] iscsi_if_stop_conn+0x14a/0x150 [scsi_transport_iscsi] iscsi_if_rx+0x1135/0x1834 [scsi_transport_iscsi] ? netlink_lookup+0x12f/0x1b0 ? netlink_deliver_tap+0x2c/0x200 netlink_unicast+0x1ab/0x280 netlink_sendmsg+0x257/0x4f0 ? _copy_from_user+0x29/0x60 sock_sendmsg+0x5f/0x70

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before f53af99f441ee79599d8df6113a7144d74cf9153Affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before 9ea6d961566c7d762ed0204b06db05756fdda3b6Affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before fd5aad080edb501ab5c84b7623d612d0e3033403Affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before a145c269dc5380c063a20a0db7e6df2995962e9dAffected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before 66a373f50b4249d57f5a88c7be9676f9d5884865Affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before 35782c32528d82aa21f84cb5ceb2abd3526a8159Affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19Affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before 2b242ea14386a510010eabfbfc3ce81a101f3802Affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before 3ea3a256ed81f95ab0f3281a0e234b01a9cae605Affected
LinuxLinux	2.6.27Affected before 2.6.27Not affected 5.4.297 through 5.4.Not affected 5.10.241 through 5.10.Not affected 5.15.190 through 5.15.Not affected 6.1.149 through 6.1.Not affected 6.6.103 through 6.6.Not affected 6.12.43 through 6.12.Not affected 6.15.11 through 6.15.Not affected 6.16.2 through 6.16.Not affected 6.17 and laterNot affected

Product

Versions

LinuxLinux

5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before f53af99f441ee79599d8df6113a7144d74cf9153Affected
5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before 9ea6d961566c7d762ed0204b06db05756fdda3b6Affected
5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before fd5aad080edb501ab5c84b7623d612d0e3033403Affected
5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before a145c269dc5380c063a20a0db7e6df2995962e9dAffected
5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before 66a373f50b4249d57f5a88c7be9676f9d5884865Affected
5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before 35782c32528d82aa21f84cb5ceb2abd3526a8159Affected
5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19Affected
5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before 2b242ea14386a510010eabfbfc3ce81a101f3802Affected
5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 to before 3ea3a256ed81f95ab0f3281a0e234b01a9cae605Affected

LinuxLinux

2.6.27Affected
before 2.6.27Not affected
5.4.297 through 5.4.*Not affected
5.10.241 through 5.10.*Not affected
5.15.190 through 5.15.*Not affected
6.1.149 through 6.1.*Not affected
6.6.103 through 6.6.*Not affected
6.12.43 through 6.12.*Not affected
6.15.11 through 6.15.*Not affected
6.16.2 through 6.16.*Not affected
6.17 and laterNot affected

References

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