CVE-2024-44950 (GCVE-0-2024-44950)

Vulnerability from cvelistv5 – Published: 2024-09-04 18:35 – Updated: 2026-08-05 11:37
VLAI
Title
serial: sc16is7xx: fix invalid FIFO access with special register set
Summary
In the Linux kernel, the following vulnerability has been resolved: serial: sc16is7xx: fix invalid FIFO access with special register set When enabling access to the special register set, Receiver time-out and RHR interrupts can happen. In this case, the IRQ handler will try to read from the FIFO thru the RHR register at address 0x00, but address 0x00 is mapped to DLL register, resulting in erroneous FIFO reading. Call graph example: sc16is7xx_startup(): entry sc16is7xx_ms_proc(): entry sc16is7xx_set_termios(): entry sc16is7xx_set_baud(): DLH/DLL = $009C --> access special register set sc16is7xx_port_irq() entry --> IIR is 0x0C sc16is7xx_handle_rx() entry sc16is7xx_fifo_read(): --> unable to access FIFO (RHR) because it is mapped to DLL (LCR=LCR_CONF_MODE_A) sc16is7xx_set_baud(): exit --> Restore access to general register set Fix the problem by claiming the efr_lock mutex when accessing the Special register set.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: dfeae619d781dee61666d5551b93ba3be755a86b , < cc6a3f35bc9b3a8da1b195420a2e8d9fdadfa831 (git)
Affected: dfeae619d781dee61666d5551b93ba3be755a86b , < dc5ead0e8fc5ef53b8553394d4aab60c277976b3 (git)
Affected: dfeae619d781dee61666d5551b93ba3be755a86b , < 6a6730812220a9a5ce4003eb347da1ee5abd06b0 (git)
Affected: dfeae619d781dee61666d5551b93ba3be755a86b , < 7d3b793faaab1305994ce568b59d61927235f57b (git)
Create a notification for this product.
Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.64 , ≤ 6.6.* (semver)
Unaffected: 6.10.5 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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In this case, the IRQ handler will try to read\\nfrom the FIFO thru the RHR register at address 0x00, but address 0x00 is\\nmapped to DLL register, resulting in erroneous FIFO reading.\\n\\nCall graph example:\\n    sc16is7xx_startup(): entry\\n    sc16is7xx_ms_proc(): entry\\n    sc16is7xx_set_termios(): entry\\n    sc16is7xx_set_baud(): DLH/DLL = $009C --\u003e access special register set\\n    sc16is7xx_port_irq() entry            --\u003e IIR is 0x0C\\n    sc16is7xx_handle_rx() entry\\n    sc16is7xx_fifo_read(): --\u003e unable to access FIFO (RHR) because it is\\n                               mapped to DLL (LCR=LCR_CONF_MODE_A)\\n    sc16is7xx_set_baud(): exit --\u003e Restore access to general register set\\n\\nFix the problem by claiming the efr_lock mutex when accessing the Special\\nregister set.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: serial: sc16is7xx: se corrige el acceso FIFO no v\u00e1lido con un conjunto de registros especiales. Al habilitar el acceso al conjunto de registros especiales, pueden producirse interrupciones de RHR y tiempo de espera del receptor. En este caso, el controlador IRQ intentar\u00e1 leer desde el FIFO a trav\u00e9s del registro RHR en la direcci\u00f3n 0x00, pero la direcci\u00f3n 0x00 est\u00e1 asignada al registro DLL, lo que da como resultado una lectura FIFO err\u00f3nea. Ejemplo de gr\u00e1fico de llamadas: sc16is7xx_startup(): entrada sc16is7xx_ms_proc(): entrada sc16is7xx_set_termios(): entrada sc16is7xx_set_baud(): DLH/DLL = $009C --\u0026gt; acceder al conjunto de registros especiales sc16is7xx_port_irq() entrada --\u0026gt; IIR es 0x0C sc16is7xx_handle_rx() entrada sc16is7xx_fifo_read(): --\u0026gt; no se puede acceder a FIFO (RHR) porque est\u00e1 asignado a DLL (LCR=LCR_CONF_MODE_A) sc16is7xx_set_baud(): salida --\u0026gt; Restaurar el acceso al conjunto de registros generales Solucione el problema reclamando el mutex efr_lock al acceder al conjunto de registros especiales.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/tty/serial/sc16is7xx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"dfeae619d781dee61666d5551b93ba3be755a86b\",\"lessThan\":\"cc6a3f35bc9b3a8da1b195420a2e8d9fdadfa831\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dfeae619d781dee61666d5551b93ba3be755a86b\",\"lessThan\":\"dc5ead0e8fc5ef53b8553394d4aab60c277976b3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dfeae619d781dee61666d5551b93ba3be755a86b\",\"lessThan\":\"6a6730812220a9a5ce4003eb347da1ee5abd06b0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dfeae619d781dee61666d5551b93ba3be755a86b\",\"lessThan\":\"7d3b793faaab1305994ce568b59d61927235f57b\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/tty/serial/sc16is7xx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.120\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.64\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.10.5\",\"lessThanOrEqual\":\"6.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.11\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-09-10T17:40:23.237971Z\",\"id\":\"CVE-2024-44950\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.16\",\"versionEndExcluding\":\"6.10.5\",\"matchCriteriaId\":\"2AAEF74C-138D-4D04-8AD8-163EB2A9720E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"8B3CE743-2126-47A3-8B7C-822B502CF119\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4DEB27E7-30AA-45CC-8934-B89263EF3551\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6a6730812220a9a5ce4003eb347da1ee5abd06b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7d3b793faaab1305994ce568b59d61927235f57b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cc6a3f35bc9b3a8da1b195420a2e8d9fdadfa831\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc5ead0e8fc5ef53b8553394d4aab60c277976b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
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    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T20:39:00.788Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-44950\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T17:40:23.237971Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:27.682Z\"}}], \"cna\": {\"title\": \"serial: sc16is7xx: fix invalid FIFO access with special register set\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"dfeae619d781dee61666d5551b93ba3be755a86b\", \"lessThan\": \"cc6a3f35bc9b3a8da1b195420a2e8d9fdadfa831\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dfeae619d781dee61666d5551b93ba3be755a86b\", \"lessThan\": \"dc5ead0e8fc5ef53b8553394d4aab60c277976b3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dfeae619d781dee61666d5551b93ba3be755a86b\", \"lessThan\": \"6a6730812220a9a5ce4003eb347da1ee5abd06b0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dfeae619d781dee61666d5551b93ba3be755a86b\", \"lessThan\": \"7d3b793faaab1305994ce568b59d61927235f57b\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/tty/serial/sc16is7xx.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.120\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.64\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/tty/serial/sc16is7xx.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/cc6a3f35bc9b3a8da1b195420a2e8d9fdadfa831\"}, {\"url\": \"https://git.kernel.org/stable/c/dc5ead0e8fc5ef53b8553394d4aab60c277976b3\"}, {\"url\": \"https://git.kernel.org/stable/c/6a6730812220a9a5ce4003eb347da1ee5abd06b0\"}, {\"url\": \"https://git.kernel.org/stable/c/7d3b793faaab1305994ce568b59d61927235f57b\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nserial: sc16is7xx: fix invalid FIFO access with special register set\\n\\nWhen enabling access to the special register set, Receiver time-out and\\nRHR interrupts can happen. In this case, the IRQ handler will try to read\\nfrom the FIFO thru the RHR register at address 0x00, but address 0x00 is\\nmapped to DLL register, resulting in erroneous FIFO reading.\\n\\nCall graph example:\\n    sc16is7xx_startup(): entry\\n    sc16is7xx_ms_proc(): entry\\n    sc16is7xx_set_termios(): entry\\n    sc16is7xx_set_baud(): DLH/DLL = $009C --\u003e access special register set\\n    sc16is7xx_port_irq() entry            --\u003e IIR is 0x0C\\n    sc16is7xx_handle_rx() entry\\n    sc16is7xx_fifo_read(): --\u003e unable to access FIFO (RHR) because it is\\n                               mapped to DLL (LCR=LCR_CONF_MODE_A)\\n    sc16is7xx_set_baud(): exit --\u003e Restore access to general register set\\n\\nFix the problem by claiming the efr_lock mutex when accessing the Special\\nregister set.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.120\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.64\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.5\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"3.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:32:36.594Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-44950\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:32:36.594Z\", \"dateReserved\": \"2024-08-21T05:34:56.665Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-09-04T18:35:50.602Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.