{"id":"CVE-2025-38700","title":"scsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated\n\nIn case of an ib_fast_reg_mr allocation failure during iSER setup, the\nmachine hits a panic …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < f53af99f441ee79599d8df6113a7144d74cf9153","Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 9ea6d961566c7d762ed0204b06db05756fdda3b6","Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < fd5aad080edb501ab5c84b7623d612d0e3033403","Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < a145c269dc5380c063a20a0db7e6df2995962e9d","Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 66a373f50b4249d57f5a88c7be9676f9d5884865","Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 35782c32528d82aa21f84cb5ceb2abd3526a8159","Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19","Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 2b242ea14386a510010eabfbfc3ce81a101f3802","Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 3ea3a256ed81f95ab0f3281a0e234b01a9cae605","Linux 2.6.27"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T21:07:38.309739Z"},"published":"2025-09-04","updated":"2026-11-05","sourceUpdated":"2026-11-05T21:12:53.632Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38700","references":[{"url":"https://git.kernel.org/stable/c/f53af99f441ee79599d8df6113a7144d74cf9153"},{"url":"https://git.kernel.org/stable/c/9ea6d961566c7d762ed0204b06db05756fdda3b6"},{"url":"https://git.kernel.org/stable/c/fd5aad080edb501ab5c84b7623d612d0e3033403"},{"url":"https://git.kernel.org/stable/c/a145c269dc5380c063a20a0db7e6df2995962e9d"},{"url":"https://git.kernel.org/stable/c/66a373f50b4249d57f5a88c7be9676f9d5884865"},{"url":"https://git.kernel.org/stable/c/35782c32528d82aa21f84cb5ceb2abd3526a8159"},{"url":"https://git.kernel.org/stable/c/a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19"},{"url":"https://git.kernel.org/stable/c/2b242ea14386a510010eabfbfc3ce81a101f3802"},{"url":"https://git.kernel.org/stable/c/3ea3a256ed81f95ab0f3281a0e234b01a9cae605"}],"tags":["cve.org"],"epss":0.00183,"epssPercentile":0.0793,"ingestedAt":"2026-11-05T22:38:32.014Z","slug":"CVE-2025-38700","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated\n\nIn case of an ib_fast_reg_mr allocation failure during iSER setup, the\nmachine hits a panic because iscsi_conn->dd_data is initialized\nunconditionally, even when no memory is allocated (dd_size == 0).  This\nleads invalid pointer dereference during connection teardown.\n\nFix by setting iscsi_conn->dd_data only if memory is actually allocated.\n\nPanic trace:\n------------\n iser: iser_create_fastreg_desc: Failed to allocate ib_fast_reg_mr err=-12\n iser: iser_alloc_rx_descriptors: failed allocating rx descriptors / data buffers\n BUG: unable to handle page fault for address: fffffffffffffff8\n RIP: 0010:swake_up_locked.part.5+0xa/0x40\n Call Trace:\n  complete+0x31/0x40\n  iscsi_iser_conn_stop+0x88/0xb0 [ib_iser]\n  iscsi_stop_conn+0x66/0xc0 [scsi_transport_iscsi]\n  iscsi_if_stop_conn+0x14a/0x150 [scsi_transport_iscsi]\n  iscsi_if_rx+0x1135/0x1834 [scsi_transport_iscsi]\n  ? netlink_lookup+0x12f/0x1b0\n  ? netlink_deliver_tap+0x2c/0x200\n  netlink_unicast+0x1ab/0x280\n  netlink_sendmsg+0x257/0x4f0\n  ? _copy_from_user+0x29/0x60\n  sock_sendmsg+0x5f/0x70\n\n## Affected\n\n- `Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < f53af99f441ee79599d8df6113a7144d74cf9153`\n- `Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 9ea6d961566c7d762ed0204b06db05756fdda3b6`\n- `Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < fd5aad080edb501ab5c84b7623d612d0e3033403`\n- `Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < a145c269dc5380c063a20a0db7e6df2995962e9d`\n- `Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 66a373f50b4249d57f5a88c7be9676f9d5884865`\n- `Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 35782c32528d82aa21f84cb5ceb2abd3526a8159`\n- `Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19`\n- `Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 2b242ea14386a510010eabfbfc3ce81a101f3802`\n- `Linux >= 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 < 3ea3a256ed81f95ab0f3281a0e234b01a9cae605`\n- `Linux 2.6.27`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}