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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53384
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 12:16:49 UTC
Updated2026-07-20 15:16:40 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001730000 probability, percentile 0.069330000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cc816969d7b5973d2720d9afd381f06f0eac6885 ccdf4510a3873b14e5e348cdb038717996f09fda git Not specified
CNA Linux Linux affected cc816969d7b5973d2720d9afd381f06f0eac6885 511d2b92f8d20de04acafab676150d26fb5c67f4 git Not specified
CNA Linux Linux affected cc816969d7b5973d2720d9afd381f06f0eac6885 07ffe414a708ae60551401cec5d727ed156b8caf git Not specified
CNA Linux Linux affected cc816969d7b5973d2720d9afd381f06f0eac6885 3d205fe80f2181f0109150ad1fa06ee5bc046935 git Not specified
CNA Linux Linux affected cc816969d7b5973d2720d9afd381f06f0eac6885 d72650a4f334581b23a1892b888a4cb1be142f76 git Not specified
CNA Linux Linux affected cc816969d7b5973d2720d9afd381f06f0eac6885 778b9dda4b24005a27bcd9c35c110bf8d7f259ca git Not specified
CNA Linux Linux affected cc816969d7b5973d2720d9afd381f06f0eac6885 10fc708b4de7f86002d2d735a2dbf3b5b7f65692 git Not specified
CNA Linux Linux affected 5.9 Not specified
CNA Linux Linux unaffected 5.9 semver Not specified
CNA Linux Linux unaffected 6.1.177 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.144 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.38 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.14 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1.2 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

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