{ "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" } } } }