CVE-2025-38700

Summary

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

Affected Software

VendorProductVersion RangeStatus
LinuxLinux5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < f53af99f441ee79599d8df6113a7144d74cf9153affected
LinuxLinux5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 9ea6d961566c7d762ed0204b06db05756fdda3b6affected
LinuxLinux5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < fd5aad080edb501ab5c84b7623d612d0e3033403affected
LinuxLinux5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < a145c269dc5380c063a20a0db7e6df2995962e9daffected
LinuxLinux5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 66a373f50b4249d57f5a88c7be9676f9d5884865affected
LinuxLinux5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 35782c32528d82aa21f84cb5ceb2abd3526a8159affected
LinuxLinux5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19affected
LinuxLinux5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 2b242ea14386a510010eabfbfc3ce81a101f3802affected
LinuxLinux5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 3ea3a256ed81f95ab0f3281a0e234b01a9cae605affected
LinuxLinux2.6.27affected
LinuxLinux0 < 2.6.27unaffected
LinuxLinux5.4.297 <= 5.4.*unaffected
LinuxLinux5.10.241 <= 5.10.*unaffected
LinuxLinux5.15.190 <= 5.15.*unaffected
LinuxLinux6.1.149 <= 6.1.*unaffected
LinuxLinux6.6.103 <= 6.6.*unaffected
LinuxLinux6.12.43 <= 6.12.*unaffected
LinuxLinux6.15.11 <= 6.15.*unaffected
LinuxLinux6.16.2 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

Additional References

References