CVE-2025-38700 (GCVE-0-2025-38700)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:32 – Updated: 2026-11-05 21:12
VLAI
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
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 21:07 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted 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 Create a notification for this product.
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 Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
guessed Create a notification for this product.
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            "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"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nscsi: libiscsi: Inicializar iscsi_conn-\u003edd_data solo si se asigna memoria\n\nEn caso de un fallo de asignaci\u00f3n de ib_fast_reg_mr durante la configuraci\u00f3n de iSER, la m\u00e1quina entra en p\u00e1nico porque iscsi_conn-\u003edd_data se inicializa incondicionalmente, incluso cuando no se asigna memoria (dd_size == 0). Esto conduce a una desreferencia de puntero no v\u00e1lida durante la desconexi\u00f3n.\n\nSoluci\u00f3n: establecer iscsi_conn-\u003edd_data solo si la memoria est\u00e1 realmente asignada.\n\nTraza de p\u00e1nico:\n------------\n iser: iser_create_fastreg_desc: Fallo al asignar ib_fast_reg_mr err=-12\n iser: iser_alloc_rx_descriptors: fallo al asignar descriptores rx / b\u00faferes de datos\n BUG: no se puede manejar el fallo de p\u00e1gina para la direcci\u00f3n: fffffffffffffff8\n RIP: 0010:swake_up_locked.part.5+0xa/0x40\n Traza de llamada:\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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            },
            {
              "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"
            }
          ],
          "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": "2026-11-05T21:12:53.632Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.