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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-38700
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-04 16:15:38 UTC
Updated2026-05-12 13:16:59 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 f53af99f441ee79599d8df6113a7144d74cf9153 git Not specified
CNA Linux Linux affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 9ea6d961566c7d762ed0204b06db05756fdda3b6 git Not specified
CNA Linux Linux affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 fd5aad080edb501ab5c84b7623d612d0e3033403 git Not specified
CNA Linux Linux affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 a145c269dc5380c063a20a0db7e6df2995962e9d git Not specified
CNA Linux Linux affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 66a373f50b4249d57f5a88c7be9676f9d5884865 git Not specified
CNA Linux Linux affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 35782c32528d82aa21f84cb5ceb2abd3526a8159 git Not specified
CNA Linux Linux affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19 git Not specified
CNA Linux Linux affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 2b242ea14386a510010eabfbfc3ce81a101f3802 git Not specified
CNA Linux Linux affected 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 3ea3a256ed81f95ab0f3281a0e234b01a9cae605 git Not specified
CNA Linux Linux affected 2.6.27 Not specified
CNA Linux Linux unaffected 2.6.27 semver Not specified
CNA Linux Linux unaffected 5.4.297 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.241 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.190 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.149 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.103 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.43 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.11 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16.2 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2b242ea14386a510010eabfbfc3ce81a101f3802 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3ea3a256ed81f95ab0f3281a0e234b01a9cae605 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/66a373f50b4249d57f5a88c7be9676f9d5884865 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fd5aad080edb501ab5c84b7623d612d0e3033403 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f53af99f441ee79599d8df6113a7144d74cf9153 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/a145c269dc5380c063a20a0db7e6df2995962e9d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/35782c32528d82aa21f84cb5ceb2abd3526a8159 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9ea6d961566c7d762ed0204b06db05756fdda3b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
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