GHSA-HW6F-2V4X-M477
Vulnerability from github – Published: 2024-09-04 21:30 – Updated: 2025-11-03 21:31In 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.
{
"affected": [],
"aliases": [
"CVE-2024-44950"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-09-04T19:15:30Z",
"severity": "MODERATE"
},
"details": "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.",
"id": "GHSA-hw6f-2v4x-m477",
"modified": "2025-11-03T21:31:12Z",
"published": "2024-09-04T21:30:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-44950"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6a6730812220a9a5ce4003eb347da1ee5abd06b0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7d3b793faaab1305994ce568b59d61927235f57b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cc6a3f35bc9b3a8da1b195420a2e8d9fdadfa831"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dc5ead0e8fc5ef53b8553394d4aab60c277976b3"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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