Medium 5.5Published Sep 4, 2025

CVE-2025-38700scsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated

Updated under an hour ago (Oct 27, 2026, 1:10 AM ET)

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Exploited in the last 30 days

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

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: May 12, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 before f53af99f441ee79599d8df6113a7144d74cf9153; from 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 before 9ea6d961566c7d762ed0204b06db05756fdda3b6; from 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 before fd5aad080edb501ab5c84b7623d612d0e3033403; from 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 before a145c269dc5380c063a20a0db7e6df2995962e9d; from 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 before 66a373f50b4249d57f5a88c7be9676f9d5884865; from 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 before 35782c32528d82aa21f84cb5ceb2abd3526a8159; from 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 before a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19; 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 builds before 2b242ea14386a510010eabfbfc3ce81a101f3802; and 1 more ranges	CNA record
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V5.0	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.27 before 5.4.297; from 5.5 before 5.10.241; from 5.11 before 5.15.190; from 5.16 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.43; from 6.13 before 6.15.11; from 6.16 before 6.16.2	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/f53af99f441ee79599d8df6113a7144d74cf9153	patch
https://git.kernel.org/stable/c/9ea6d961566c7d762ed0204b06db05756fdda3b6	patch
https://git.kernel.org/stable/c/fd5aad080edb501ab5c84b7623d612d0e3033403	patch
https://git.kernel.org/stable/c/a145c269dc5380c063a20a0db7e6df2995962e9d	patch
https://git.kernel.org/stable/c/66a373f50b4249d57f5a88c7be9676f9d5884865	patch
https://git.kernel.org/stable/c/35782c32528d82aa21f84cb5ceb2abd3526a8159	patch
https://git.kernel.org/stable/c/a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19	patch
https://git.kernel.org/stable/c/2b242ea14386a510010eabfbfc3ce81a101f3802	patch
https://git.kernel.org/stable/c/3ea3a256ed81f95ab0f3281a0e234b01a9cae605	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	mailing-list, third-party-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.