CVE-2025-38700 (GCVE-0-2025-38700)
Vulnerability from cvelistv5 – Published: 2025-09-04 15:32 – Updated: 2026-05-12 12:05
VLAI
EPSS
VEX
Title
scsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated
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
Severity
5.5 (Medium)
Assigner
References
12 references
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 , < f53af99f441ee79599d8df6113a7144d74cf9153
(git)
Affected: 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 , < 9ea6d961566c7d762ed0204b06db05756fdda3b6 (git) Affected: 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 , < fd5aad080edb501ab5c84b7623d612d0e3033403 (git) Affected: 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 , < a145c269dc5380c063a20a0db7e6df2995962e9d (git) Affected: 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 , < 66a373f50b4249d57f5a88c7be9676f9d5884865 (git) Affected: 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 , < 35782c32528d82aa21f84cb5ceb2abd3526a8159 (git) Affected: 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 , < a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19 (git) Affected: 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 , < 2b242ea14386a510010eabfbfc3ce81a101f3802 (git) Affected: 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187 , < 3ea3a256ed81f95ab0f3281a0e234b01a9cae605 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.27
Unaffected: 0 , < 2.6.27 (semver) Unaffected: 5.4.297 , ≤ 5.4.* (semver) Unaffected: 5.10.241 , ≤ 5.10.* (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.149 , ≤ 6.1.* (semver) Unaffected: 6.6.103 , ≤ 6.6.* (semver) Unaffected: 6.12.43 , ≤ 6.12.* (semver) Unaffected: 6.15.11 , ≤ 6.15.* (semver) Unaffected: 6.16.2 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC CN 4100 |
Affected:
0 , < V5.0
(custom)
|
guessed |
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi: Initialize iscsi_conn-\u003edd_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-\u003edd_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-\u003edd_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"
}
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"url": "https://git.kernel.org/stable/c/f53af99f441ee79599d8df6113a7144d74cf9153"
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{
"url": "https://git.kernel.org/stable/c/9ea6d961566c7d762ed0204b06db05756fdda3b6"
},
{
"url": "https://git.kernel.org/stable/c/fd5aad080edb501ab5c84b7623d612d0e3033403"
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{
"url": "https://git.kernel.org/stable/c/a145c269dc5380c063a20a0db7e6df2995962e9d"
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{
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"url": "https://git.kernel.org/stable/c/35782c32528d82aa21f84cb5ceb2abd3526a8159"
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"url": "https://git.kernel.org/stable/c/2b242ea14386a510010eabfbfc3ce81a101f3802"
},
{
"url": "https://git.kernel.org/stable/c/3ea3a256ed81f95ab0f3281a0e234b01a9cae605"
}
],
"title": "scsi: libiscsi: Initialize iscsi_conn-\u003edd_data only if memory is allocated",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-38700",
"datePublished": "2025-09-04T15:32:52.241Z",
"dateReserved": "2025-04-16T04:51:24.032Z",
"dateUpdated": "2026-05-12T12:05:37.822Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-38700",
"date": "2026-09-15",
"epss": "0.0017",
"percentile": "0.06698"
},
"microsoft_vex": {
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"cve": "CVE-2025-38700",
"id": "msrc_CVE-2025-38700",
"initial_release_date": "2025-09-02T00:00:00.000Z",
"product_status:fixed": "2",
"product_status:known_affected": "3",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "scsi: libiscsi: Initialize iscsi_conn-\u003edd_data only if memory is allocated",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-38700.json",
"version": "4"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2025-38700\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-04T16:15:38.680\",\"lastModified\":\"2026-06-17T09:17:41.403\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nscsi: libiscsi: Initialize iscsi_conn-\u003edd_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-\u003edd_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-\u003edd_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 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CN 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T01:15:10+00:00",
"cve": "CVE-2025-38700",
"id": "CVE-2025-38700",
"initial_release_date": "2025-09-04T00:00:00+00:00",
"product_status:known_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: scsi: libiscsi: Initialize iscsi_conn-\u003edd_data only if memory is allocated",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38700.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-03T00:14:04Z",
"cve": "CVE-2025-38700",
"id": "CVE-2025-38700",
"initial_release_date": "2025-09-04T23:23:48Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "729",
"product_status:recommended": "501",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-38700",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38700.json",
"version": "48"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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