Vulnerability-Lookup

FKIE_CVE-2025-39857

Vulnerability from fkie_nvd - Published: 2025-09-19 16:15 - Updated: 2026-07-30 06:23

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync() BUG: kernel NULL pointer dereference, address: 00000000000002ec PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP PTI CPU: 28 UID: 0 PID: 343 Comm: kworker/28:1 Kdump: loaded Tainted: G OE 6.17.0-rc2+ #9 NONE Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 Workqueue: smc_hs_wq smc_listen_work [smc] RIP: 0010:smc_ib_is_sg_need_sync+0x9e/0xd0 [smc] ... Call Trace: <TASK> smcr_buf_map_link+0x211/0x2a0 [smc] __smc_buf_create+0x522/0x970 [smc] smc_buf_create+0x3a/0x110 [smc] smc_find_rdma_v2_device_serv+0x18f/0x240 [smc] ? smc_vlan_by_tcpsk+0x7e/0xe0 [smc] smc_listen_find_device+0x1dd/0x2b0 [smc] smc_listen_work+0x30f/0x580 [smc] process_one_work+0x18c/0x340 worker_thread+0x242/0x360 kthread+0xe7/0x220 ret_from_fork+0x13a/0x160 ret_from_fork_asm+0x1a/0x30 </TASK> If the software RoCE device is used, ibdev->dma_device is a null pointer. As a result, the problem occurs. Null pointer detection is added to prevent problems.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0cdf1fd8fc59d44a48c694324611136910301ef9	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/34f17cbe027050b8d5316ea1b6f9bd7c378e92de	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ba1e9421cf1a8369d25c3832439702a015d6b5f9	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eb929910bd4b4165920fa06a87b22cc6cae92e0e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f18d9b3abf9c6587372cc702f963a7592277ed56	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Mailing List, Third Party Advisory
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e	https://cert-portal.siemens.com/productcert/html/ssa-032379.html

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
debian	debian_linux	11.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_ib.c"
          ],
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              "versionType": "git"
            }
          ]
        },
        {
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
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              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.12.46",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.16.6",
              "versionType": "semver"
            },
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              "status": "unaffected",
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            }
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        }
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    },
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          "vendor": "Siemens",
          "versions": [
            {
              "lessThan": "V5.0",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
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      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()\n\nBUG: kernel NULL pointer dereference, address: 00000000000002ec\nPGD 0 P4D 0\nOops: Oops: 0000 [#1] SMP PTI\nCPU: 28 UID: 0 PID: 343 Comm: kworker/28:1 Kdump: loaded Tainted: G        OE       6.17.0-rc2+ #9 NONE\nTainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\nWorkqueue: smc_hs_wq smc_listen_work [smc]\nRIP: 0010:smc_ib_is_sg_need_sync+0x9e/0xd0 [smc]\n...\nCall Trace:\n \u003cTASK\u003e\n smcr_buf_map_link+0x211/0x2a0 [smc]\n __smc_buf_create+0x522/0x970 [smc]\n smc_buf_create+0x3a/0x110 [smc]\n smc_find_rdma_v2_device_serv+0x18f/0x240 [smc]\n ? smc_vlan_by_tcpsk+0x7e/0xe0 [smc]\n smc_listen_find_device+0x1dd/0x2b0 [smc]\n smc_listen_work+0x30f/0x580 [smc]\n process_one_work+0x18c/0x340\n worker_thread+0x242/0x360\n kthread+0xe7/0x220\n ret_from_fork+0x13a/0x160\n ret_from_fork_asm+0x1a/0x30\n \u003c/TASK\u003e\n\nIf the software RoCE device is used, ibdev-\u003edma_device is a null pointer.\nAs a result, the problem occurs. Null pointer detection is added to\nprevent problems."
    }
  ],
  "id": "CVE-2025-39857",
  "lastModified": "2026-07-30T06:23:51.340",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
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        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  },
  "published": "2025-09-19T16:15:44.650",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "Third Party Advisory"
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-39857 (GCVE-0-2025-39857)

Vulnerability from cvelistv5 – Published: 2025-09-19 15:26 – Updated: 2026-08-05 12:05

Title

net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()

Summary

Severity

7.5 (High)


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

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/0cdf1fd8fc59d44a4…
https://git.kernel.org/stable/c/f18d9b3abf9c65873…
https://git.kernel.org/stable/c/eb929910bd4b41659…
https://git.kernel.org/stable/c/34f17cbe027050b8d…
https://git.kernel.org/stable/c/ba1e9421cf1a8369d…
https://lists.debian.org/debian-lts-announce/2025…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

3 products

Vendor	Product	Version
Linux	Linux	Affected: 0ef69e788411cba2af017db731a9fc62d255e9ac , < 0cdf1fd8fc59d44a48c694324611136910301ef9 (git) Affected: 0ef69e788411cba2af017db731a9fc62d255e9ac , < f18d9b3abf9c6587372cc702f963a7592277ed56 (git) Affected: 0ef69e788411cba2af017db731a9fc62d255e9ac , < eb929910bd4b4165920fa06a87b22cc6cae92e0e (git) Affected: 0ef69e788411cba2af017db731a9fc62d255e9ac , < 34f17cbe027050b8d5316ea1b6f9bd7c378e92de (git) Affected: 0ef69e788411cba2af017db731a9fc62d255e9ac , < ba1e9421cf1a8369d25c3832439702a015d6b5f9 (git)
Linux	Linux	Affected: 6.0 Unaffected: 0 , < 6.0 (semver) Unaffected: 6.1.151 , ≤ 6.1.* (semver) Unaffected: 6.6.105 , ≤ 6.6.* (semver) Unaffected: 6.12.46 , ≤ 6.12.* (semver) Unaffected: 6.16.6 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC CN 4100	Affected: 0 , < V5.0 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:44:10.731Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
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            "product": "SIMATIC CN 4100",
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      }
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    "cna": {
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()\n\nBUG: kernel NULL pointer dereference, address: 00000000000002ec\nPGD 0 P4D 0\nOops: Oops: 0000 [#1] SMP PTI\nCPU: 28 UID: 0 PID: 343 Comm: kworker/28:1 Kdump: loaded Tainted: G        OE       6.17.0-rc2+ #9 NONE\nTainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\nWorkqueue: smc_hs_wq smc_listen_work [smc]\nRIP: 0010:smc_ib_is_sg_need_sync+0x9e/0xd0 [smc]\n...\nCall Trace:\n \u003cTASK\u003e\n smcr_buf_map_link+0x211/0x2a0 [smc]\n __smc_buf_create+0x522/0x970 [smc]\n smc_buf_create+0x3a/0x110 [smc]\n smc_find_rdma_v2_device_serv+0x18f/0x240 [smc]\n ? smc_vlan_by_tcpsk+0x7e/0xe0 [smc]\n smc_listen_find_device+0x1dd/0x2b0 [smc]\n smc_listen_work+0x30f/0x580 [smc]\n process_one_work+0x18c/0x340\n worker_thread+0x242/0x360\n kthread+0xe7/0x220\n ret_from_fork+0x13a/0x160\n ret_from_fork_asm+0x1a/0x30\n \u003c/TASK\u003e\n\nIf the software RoCE device is used, ibdev-\u003edma_device is a null pointer.\nAs a result, the problem occurs. Null pointer detection is added to\nprevent problems."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The crash is triggered by a remote peer\u0027s TCP connection plus a CLC Proposal message to an SMC-enabled listening socket, processed in smc_listen_work() on the smc_hs_wq workqueue. The triggering traffic is ordinary routable TCP (no RDMA fabric traffic is required to reach the fault), so any internet-reachable SMC server is exposed.\nAC:L - On an affected system (SMC-R backed by a soft-RoCE/rxe or siw device, a supported and commonly used configuration) the NULL dereference is hit unconditionally on the first SMC-R buffer mapping \u2014 no race, no heap grooming, no memory-layout dependency. The attacker fully controls the proposal fields that steer the server down the SMC-R v2 device path.\nPR:N - The entire path runs inside the CLC handshake worker before accept() returns to userspace, and SMC performs no authentication of the peer whatsoever. There are no capability checks anywhere in net/smc along this path.\nUI:N - The server-side handshake worker processes the attacker\u0027s connection automatically with no action by any local user or administrator.\nS:U - The fault and its consequences are confined to the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The fault is a read of NULL+0x2ec (page fault error code 0000) that aborts immediately; no data is returned to the attacker and no out-of-bounds memory is disclosed.\nI:N - No memory is written and no attacker-controlled data corrupts kernel state \u2014 the dereference faults before dma_need_sync() can act.\nA:H - The NULL dereference oopses the smc_hs_wq kworker, killing it while it holds smc_server_lgr_pending and the socket lock, so the SMC subsystem deadlocks permanently for every later connection; with panic_on_oops the whole system panics, and the attacker can repeat it unauthenticated at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:05:40.229Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0cdf1fd8fc59d44a48c694324611136910301ef9"
        },
        {
          "url": "https://git.kernel.org/stable/c/f18d9b3abf9c6587372cc702f963a7592277ed56"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb929910bd4b4165920fa06a87b22cc6cae92e0e"
        },
        {
          "url": "https://git.kernel.org/stable/c/34f17cbe027050b8d5316ea1b6f9bd7c378e92de"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba1e9421cf1a8369d25c3832439702a015d6b5f9"
        }
      ],
      "title": "net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39857",
    "datePublished": "2025-09-19T15:26:28.225Z",
    "dateReserved": "2025-04-16T07:20:57.142Z",
    "dateUpdated": "2026-08-05T12:05:40.229Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

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Nomenclature

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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.
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FKIE_CVE-2025-39857

CVE-2025-39857 (GCVE-0-2025-39857)

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