🛡️ AZL-50204 — kernel

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CVE-2024-44950 affecting package kernel for versions less than 6.6.64.2-9

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

AZL-50204 is recorded against 1 package.

  • kernel (fixed in 6.6.64.2-9)

Timeline and source

Published on 4 September 2024 and last revised on 21 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2024-09-04
Updated 2026-08-12
Modified 2026-04-21
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel — 6.6.64.2-9

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