Vulnerability-Lookup

FKIE_CVE-2026-53384

Vulnerability from fkie_nvd - Published: 2026-07-19 12:16 - Updated: 2026-10-19 20:19

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails dw8250_probe() registers the 8250 port via serial8250_register_8250_port() and then, if the device has a clock, registers a clock notifier. If clk_notifier_register() fails, probe returns the error but leaves the 8250 port registered. The matching serial8250_unregister_port() lives in dw8250_remove(), which is not called when probe fails, so the port slot stays occupied until the device is rebound or the system is rebooted. The devm-allocated driver data is freed while the port still references it (via the saved private_data and serial_in/serial_out callbacks), so any access to that port slot before a rebind is a use-after-free hazard. Unregister the port on the clk_notifier_register() error path.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/07ffe414a708ae60551401cec5d727ed156b8caf	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/10fc708b4de7f86002d2d735a2dbf3b5b7f65692	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3d205fe80f2181f0109150ad1fa06ee5bc046935	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/511d2b92f8d20de04acafab676150d26fb5c67f4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/778b9dda4b24005a27bcd9c35c110bf8d7f259ca	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ccdf4510a3873b14e5e348cdb038717996f09fda	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d72650a4f334581b23a1892b888a4cb1be142f76	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
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          "product": "Linux",
          "programFiles": [
            "drivers/tty/serial/8250/8250_dw.c"
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250_dw: unregister 8250 port if clk_notifier_register() fails\n\ndw8250_probe() registers the 8250 port via serial8250_register_8250_port()\nand then, if the device has a clock, registers a clock notifier. If\nclk_notifier_register() fails, probe returns the error but leaves the\n8250 port registered. The matching serial8250_unregister_port() lives\nin dw8250_remove(), which is not called when probe fails, so the port\nslot stays occupied until the device is rebound or the system is\nrebooted. The devm-allocated driver data is freed while the port still\nreferences it (via the saved private_data and serial_in/serial_out\ncallbacks), so any access to that port slot before a rebind is a\nuse-after-free hazard.\n\nUnregister the port on the clk_notifier_register() error path."
    }
  ],
  "id": "CVE-2026-53384",
  "lastModified": "2026-10-19T20:19:17.470",
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          "attackComplexity": "LOW",
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
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}

CVE-2026-53384 (GCVE-0-2026-53384)

Vulnerability from cvelistv5 – Published: 2026-07-19 11:59 – Updated: 2026-10-19 20:07

Title

serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails

Summary

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-16 15:29 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6820 records in the last 180 days details

References

7 references

URL	Tags
https://git.kernel.org/stable/c/ccdf4510a3873b14e…
https://git.kernel.org/stable/c/511d2b92f8d20de04…
https://git.kernel.org/stable/c/07ffe414a708ae605…
https://git.kernel.org/stable/c/3d205fe80f2181f01…
https://git.kernel.org/stable/c/d72650a4f334581b2…
https://git.kernel.org/stable/c/778b9dda4b24005a2…
https://git.kernel.org/stable/c/10fc708b4de7f8600…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 57f83e5dd6a33c4696699954784f8fee789b1d0c , < ccdf4510a3873b14e5e348cdb038717996f09fda (git) Affected: 57f83e5dd6a33c4696699954784f8fee789b1d0c , < 511d2b92f8d20de04acafab676150d26fb5c67f4 (git) Affected: 57f83e5dd6a33c4696699954784f8fee789b1d0c , < 07ffe414a708ae60551401cec5d727ed156b8caf (git) Affected: 57f83e5dd6a33c4696699954784f8fee789b1d0c , < 3d205fe80f2181f0109150ad1fa06ee5bc046935 (git) Affected: 57f83e5dd6a33c4696699954784f8fee789b1d0c , < d72650a4f334581b23a1892b888a4cb1be142f76 (git) Affected: 57f83e5dd6a33c4696699954784f8fee789b1d0c , < 778b9dda4b24005a27bcd9c35c110bf8d7f259ca (git) Affected: 57f83e5dd6a33c4696699954784f8fee789b1d0c , < 10fc708b4de7f86002d2d735a2dbf3b5b7f65692 (git)
Linux	Linux	Affected: 5.19 Unaffected: 0 , < 5.19 (semver) Unaffected: 6.1.177 , ≤ 6.1.* (semver) Unaffected: 6.6.144 , ≤ 6.6.* (semver) Unaffected: 6.12.95 , ≤ 6.12.* (semver) Unaffected: 6.18.38 , ≤ 6.18.* (semver) Unaffected: 7.0.14 , ≤ 7.0.* (semver) Unaffected: 7.1.2 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250_dw: unregister 8250 port if clk_notifier_register() fails\n\ndw8250_probe() registers the 8250 port via serial8250_register_8250_port()\nand then, if the device has a clock, registers a clock notifier. If\nclk_notifier_register() fails, probe returns the error but leaves the\n8250 port registered. The matching serial8250_unregister_port() lives\nin dw8250_remove(), which is not called when probe fails, so the port\nslot stays occupied until the device is rebound or the system is\nrebooted. The devm-allocated driver data is freed while the port still\nreferences it (via the saved private_data and serial_in/serial_out\ncallbacks), so any access to that port slot before a rebind is a\nuse-after-free hazard.\n\nUnregister the port on the clk_notifier_register() error path."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The UAF is reached when the registered 8250 port is exercised via tty/console/IRQ callbacks in dw8250_serial_in/out; on dw8250-equipped embedded/industrial systems (RZN1, StarFive, Intel PCH UARTs) serial ports are commonly bridged to TCP (ser2net, Modbus/SCADA gateways, BMC SOL), letting a remote attacker drive those kernel paths without physical UART access.\nAC:L - Once clk_notifier_register() fails during probe and devm frees dw8250_data while the port stays registered, any subsequent tty open, console write, or IRQ-driven handler reliably dereferences the dangling private_data and membase; no attacker-uncontrollable race or heap layout is required.\nPR:N - The corrupt state can arise automatically at boot when probe fails under memory pressure (no attacker action), and on typical embedded deployments the affected /dev/ttyS* is reachable via unauthenticated network serial bridges or world-accessible console nodes without Linux account privileges.\nUI:N - Exploitation requires no victim interaction beyond the attacker (or boot-time probe failure) accessing the already-registered port; no mount, plug-in, or UI action is needed.\nS:U - Impact is confined to kernel memory via the serial driver UAF; it does not cross VM, container, or IOMMU security boundaries into a separate authority.\nC:H - The bug leaves uart_port callbacks pointing at freed devm_kzalloc(dw8250_data) and freed devm_ioremap(membase), giving a kernel heap/IO-memory UAF that can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same dangling private_data and membase pointers in serial_in/serial_out/IRQ handlers enable kernel heap corruption and control-flow hijack primitives typical of exploitable UAFs.\nA:H - Any access to the orphaned port slot (tty I/O, serial console output, or IRQ handling) dereferences freed driver data and can cause kernel oops/panic, especially if the port serves as boot console."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:50:34.893Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ccdf4510a3873b14e5e348cdb038717996f09fda"
        },
        {
          "url": "https://git.kernel.org/stable/c/511d2b92f8d20de04acafab676150d26fb5c67f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/07ffe414a708ae60551401cec5d727ed156b8caf"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d205fe80f2181f0109150ad1fa06ee5bc046935"
        },
        {
          "url": "https://git.kernel.org/stable/c/d72650a4f334581b23a1892b888a4cb1be142f76"
        },
        {
          "url": "https://git.kernel.org/stable/c/778b9dda4b24005a27bcd9c35c110bf8d7f259ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/10fc708b4de7f86002d2d735a2dbf3b5b7f65692"
        }
      ],
      "title": "serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53384",
    "datePublished": "2026-07-19T11:59:32.153Z",
    "dateReserved": "2026-06-09T07:44:35.401Z",
    "dateUpdated": "2026-10-19T20:07:45.552Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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

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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.
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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.

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