Vulnerability-Lookup

FKIE_CVE-2026-23148

Vulnerability from fkie_nvd - Published: 2026-02-14 16:15 - Updated: 2026-10-19 19:17

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: nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference There is a race condition in nvmet_bio_done() that can cause a NULL pointer dereference in blk_cgroup_bio_start(): 1. nvmet_bio_done() is called when a bio completes 2. nvmet_req_complete() is called, which invokes req->ops->queue_response(req) 3. The queue_response callback can re-queue and re-submit the same request 4. The re-submission reuses the same inline_bio from nvmet_req 5. Meanwhile, nvmet_req_bio_put() (called after nvmet_req_complete) invokes bio_uninit() for inline_bio, which sets bio->bi_blkg to NULL 6. The re-submitted bio enters submit_bio_noacct_nocheck() 7. blk_cgroup_bio_start() dereferences bio->bi_blkg, causing a crash: BUG: kernel NULL pointer dereference, address: 0000000000000028 #PF: supervisor read access in kernel mode RIP: 0010:blk_cgroup_bio_start+0x10/0xd0 Call Trace: submit_bio_noacct_nocheck+0x44/0x250 nvmet_bdev_execute_rw+0x254/0x370 [nvmet] process_one_work+0x193/0x3c0 worker_thread+0x281/0x3a0 Fix this by reordering nvmet_bio_done() to call nvmet_req_bio_put() BEFORE nvmet_req_complete(). This ensures the bio is cleaned up before the request can be re-submitted, preventing the race condition.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0fcee2cfc4b2e16e62ff8e0cc2cd8dd24efad65e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/68207ceefd71cc74ce4e983fa9bd10c3122e349b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ee10b06980acca1d46e0fa36d6fb4a9578eab6e4	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19

JSON

To clipboard

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference\n\nThere is a race condition in nvmet_bio_done() that can cause a NULL\npointer dereference in blk_cgroup_bio_start():\n\n1. nvmet_bio_done() is called when a bio completes\n2. nvmet_req_complete() is called, which invokes req-\u003eops-\u003equeue_response(req)\n3. The queue_response callback can re-queue and re-submit the same request\n4. The re-submission reuses the same inline_bio from nvmet_req\n5. Meanwhile, nvmet_req_bio_put() (called after nvmet_req_complete)\n   invokes bio_uninit() for inline_bio, which sets bio-\u003ebi_blkg to NULL\n6. The re-submitted bio enters submit_bio_noacct_nocheck()\n7. blk_cgroup_bio_start() dereferences bio-\u003ebi_blkg, causing a crash:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000028\n  #PF: supervisor read access in kernel mode\n  RIP: 0010:blk_cgroup_bio_start+0x10/0xd0\n  Call Trace:\n   submit_bio_noacct_nocheck+0x44/0x250\n   nvmet_bdev_execute_rw+0x254/0x370 [nvmet]\n   process_one_work+0x193/0x3c0\n   worker_thread+0x281/0x3a0\n\nFix this by reordering nvmet_bio_done() to call nvmet_req_bio_put()\nBEFORE nvmet_req_complete(). This ensures the bio is cleaned up before\nthe request can be re-submitted, preventing the race condition."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnvmet: corregir condici\u00f3n de carrera en nvmet_bio_done() que lleva a una desreferencia de puntero NULL\n\nExiste una condici\u00f3n de carrera en nvmet_bio_done() que puede causar una desreferencia de puntero NULL en blk_cgroup_bio_start():\n\n1. nvmet_bio_done() es llamada cuando un bio se completa\n2. nvmet_req_complete() es llamada, lo que invoca req-\u0026gt;ops-\u0026gt;queue_response(req)\n3. La devoluci\u00f3n de llamada queue_response puede volver a encolar y volver a enviar la misma solicitud\n4. El reenv\u00edo reutiliza el mismo inline_bio de nvmet_req\n5. Mientras tanto, nvmet_req_bio_put() (llamada despu\u00e9s de nvmet_req_complete) invoca bio_uninit() para inline_bio, lo que establece bio-\u0026gt;bi_blkg en NULL\n6. El bio reenviado entra en submit_bio_noacct_nocheck()\n7. blk_cgroup_bio_start() desreferencia bio-\u0026gt;bi_blkg, causando un fallo:\n\n  ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000028\n  #PF: acceso de lectura de supervisor en modo kernel\n  RIP: 0010:blk_cgroup_bio_start+0x10/0xd0\n  Rastro de Llamada:\n   submit_bio_noacct_nocheck+0x44/0x250\n   nvmet_bdev_execute_rw+0x254/0x370 [nvmet]\n   process_one_work+0x193/0x3c0\n   worker_thread+0x281/0x3a0\n\nCorregir esto reordenando nvmet_bio_done() para llamar a nvmet_req_bio_put() ANTES de nvmet_req_complete(). Esto asegura que el bio se limpie antes de que la solicitud pueda ser reenviada, previniendo la condici\u00f3n de carrera."
    }
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  "lastModified": "2026-10-19T19:17:39.533",
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CVE-2026-23148 (GCVE-0-2026-23148)

Vulnerability from cvelistv5 – Published: 2026-02-14 16:01 – Updated: 2026-10-19 18:25

Title

nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-16 15:06 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6637 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/ee10b06980acca1d4…
https://git.kernel.org/stable/c/68207ceefd71cc74c…
https://git.kernel.org/stable/c/0fcee2cfc4b2e16e6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 431e58d56fcb5ff1f9eb630724a922e0d2a941df , < ee10b06980acca1d46e0fa36d6fb4a9578eab6e4 (git) Affected: 190f4c2c863af7cc5bb354b70e0805f06419c038 , < 68207ceefd71cc74ce4e983fa9bd10c3122e349b (git) Affected: 190f4c2c863af7cc5bb354b70e0805f06419c038 , < 0fcee2cfc4b2e16e62ff8e0cc2cd8dd24efad65e (git) Affected: 2e2028fcf924d1c6df017033c8d6e28b735a0508 (git) Affected: 6.12.37 , < 6.12.69 (semver) Affected: 6.15.6 , < 6.16 (semver)
Linux	Linux	Affected: 6.16 Unaffected: 0 , < 6.16 (semver) Unaffected: 6.12.69 , ≤ 6.12.* (semver) Unaffected: 6.18.9 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.15.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference\n\nThere is a race condition in nvmet_bio_done() that can cause a NULL\npointer dereference in blk_cgroup_bio_start():\n\n1. nvmet_bio_done() is called when a bio completes\n2. nvmet_req_complete() is called, which invokes req-\u003eops-\u003equeue_response(req)\n3. The queue_response callback can re-queue and re-submit the same request\n4. The re-submission reuses the same inline_bio from nvmet_req\n5. Meanwhile, nvmet_req_bio_put() (called after nvmet_req_complete)\n   invokes bio_uninit() for inline_bio, which sets bio-\u003ebi_blkg to NULL\n6. The re-submitted bio enters submit_bio_noacct_nocheck()\n7. blk_cgroup_bio_start() dereferences bio-\u003ebi_blkg, causing a crash:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000028\n  #PF: supervisor read access in kernel mode\n  RIP: 0010:blk_cgroup_bio_start+0x10/0xd0\n  Call Trace:\n   submit_bio_noacct_nocheck+0x44/0x250\n   nvmet_bdev_execute_rw+0x254/0x370 [nvmet]\n   process_one_work+0x193/0x3c0\n   worker_thread+0x281/0x3a0\n\nFix this by reordering nvmet_bio_done() to call nvmet_req_bio_put()\nBEFORE nvmet_req_complete(). This ensures the bio is cleaned up before\nthe request can be re-submitted, preventing the race condition."
        }
      ],
      "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 nvmet (NVMe target) subsystem is reachable over the network via nvmet-tcp on TCP port 4420, allowing a remote NVMe-oF initiator to send I/O commands that trigger the vulnerable bio completion path.\nAC:L - The attacker controls both sides of the race by sending concurrent I/O commands at high queue depth over nvmet-tcp; the race between bio completion and request re-submission via the workqueue is reliably triggerable under load, as confirmed by the real crash trace in the commit message.\nPR:N - NVMe-oF over TCP does not require authentication by default; DH-HMAC-CHAP auth is optional and commonly not configured, and the hostnqn in the connect command is an unauthenticated string that can be spoofed.\nUI:N - No user interaction is required; the attacker autonomously sends NVMe I/O commands over the network to trigger the race condition.\nS:U - The vulnerability crashes the kernel within the same security authority; there is no crossing of security boundaries such as VM escape or sandbox bypass.\nC:N - The immediate impact is a NULL pointer dereference crash; no information is disclosed to the attacker as the kernel panics without leaking memory contents back over the network.\nI:N - The bug results in a kernel crash via NULL dereference, not data modification; the bio_uninit zeroing of fields on the live bio does not give the attacker a write primitive that could modify persistent data.\nA:H - The NULL pointer dereference in blk_cgroup_bio_start causes a kernel oops/panic, completely crashing the system and denying service to all users; this is remotely triggerable and repeatable."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:20:22.785Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ee10b06980acca1d46e0fa36d6fb4a9578eab6e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/68207ceefd71cc74ce4e983fa9bd10c3122e349b"
        },
        {
          "url": "https://git.kernel.org/stable/c/0fcee2cfc4b2e16e62ff8e0cc2cd8dd24efad65e"
        }
      ],
      "title": "nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23148",
    "datePublished": "2026-02-14T16:01:17.575Z",
    "dateReserved": "2026-01-13T15:37:45.975Z",
    "dateUpdated": "2026-10-19T18:25:33.568Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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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 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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