{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53384","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-06-09T07:44:35.401Z","datePublished":"2026-07-19T11:59:32.153Z","dateUpdated":"2026-08-17T04:50:34.893Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T04:50:34.893Z"},"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":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/8250/8250_dw.c"],"versions":[{"version":"57f83e5dd6a33c4696699954784f8fee789b1d0c","lessThan":"ccdf4510a3873b14e5e348cdb038717996f09fda","status":"affected","versionType":"git"},{"version":"57f83e5dd6a33c4696699954784f8fee789b1d0c","lessThan":"511d2b92f8d20de04acafab676150d26fb5c67f4","status":"affected","versionType":"git"},{"version":"57f83e5dd6a33c4696699954784f8fee789b1d0c","lessThan":"07ffe414a708ae60551401cec5d727ed156b8caf","status":"affected","versionType":"git"},{"version":"57f83e5dd6a33c4696699954784f8fee789b1d0c","lessThan":"3d205fe80f2181f0109150ad1fa06ee5bc046935","status":"affected","versionType":"git"},{"version":"57f83e5dd6a33c4696699954784f8fee789b1d0c","lessThan":"d72650a4f334581b23a1892b888a4cb1be142f76","status":"affected","versionType":"git"},{"version":"57f83e5dd6a33c4696699954784f8fee789b1d0c","lessThan":"778b9dda4b24005a27bcd9c35c110bf8d7f259ca","status":"affected","versionType":"git"},{"version":"57f83e5dd6a33c4696699954784f8fee789b1d0c","lessThan":"10fc708b4de7f86002d2d735a2dbf3b5b7f65692","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/8250/8250_dw.c"],"versions":[{"version":"5.19","status":"affected"},{"version":"0","lessThan":"5.19","status":"unaffected","versionType":"semver"},{"version":"6.1.177","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.144","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.95","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.38","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.14","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1.2","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.177"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.144"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.12.95"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.18.38"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.0.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.1.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.2"}]}]}],"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"}}}}