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

Vulnerability from cvelistv5 – Published: 2026-07-19 11:59 – Updated: 2026-08-05 12:35
VLAI
Title
serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted 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)
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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-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
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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."
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              "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."
            }
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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 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    "redhat_vex": {
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      "current_release_date": "2026-07-20T17:09:40+00:00",
      "cve": "CVE-2026-53384",
      "id": "CVE-2026-53384",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails",
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      "product_status:known_not_affected": "79",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53384",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53384.json",
      "version": "4"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.