CVE-2024-44950: serial: sc16is7xx: fix invalid FIFO access with special register set
First published: Wed Sep 04 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=3.16<6.10.5 | |
| Linux Linux kernel | =6.11-rc1 | |
| Linux Linux kernel | =6.11-rc2 | |
| debian/linux | <=5.10.223-1<=5.10.226-1<=6.1.115-1<=6.1.119-1 | 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/dc5ead0e8fc5ef53b8553394d4aab60c277976b3
- https://git.kernel.org/stable/c/6a6730812220a9a5ce4003eb347da1ee5abd06b0
- https://git.kernel.org/stable/c/7d3b793faaab1305994ce568b59d61927235f57b
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-44950
- https://nvd.nist.gov/vuln/detail/CVE-2024-44950
- https://launchpad.net/bugs/cve/CVE-2024-44950
- https://security-tracker.debian.org/tracker/CVE-2024-44950
- https://ubuntu.com/security/CVE-2024-44950
- https://git.kernel.org/linus/7d3b793faaab1305994ce568b59d61927235f57b
- https://git.kernel.org/stable/c/cc6a3f35bc9b3a8da1b195420a2e8d9fdadfa831
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