CVE-2026-23472Medium· 5.5▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: serial: core: fix infinite loop in handle_tx() for PORT_UNKNOWN uart_write_room() and uart_write() behave inconsistently when xmit_buf is NULL (which happens for PORT_…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 21.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
serial: core: fix infinite loop in handle_tx() for PORT_UNKNOWN
uart_write_room() and uart_write() behave inconsistently when xmit_buf is NULL (which happens for PORT_UNKNOWN ports that were never properly initialized):
This inconsistency causes an infinite loop in drivers that rely on tty_write_room() to determine if they can write:
while (tty_write_room(tty) > 0) { written = tty->ops->write(...); // written is always 0, loop never exits }
For example, caif_serial's handle_tx() enters an infinite loop when used with PORT_UNKNOWN serial ports, causing system hangs.
Fix by making uart_write_room() also check xmit_buf and return 0 if it's NULL, consistent with uart_write().
Reproducer: https://gist.github.com/mrpre/d9a694cc0e19828ee3bc3b37983fde13
linux_kernel >= 2.6.12.1, < 6.18.20linux_kernel >= 6.19, < 6.19.10linux_kernel = 2.6.12linux_kernel = 7.0Upgrade past the affected range:
linux_kernel 6.19.10Connected by shared product, vendor, weakness, or advisory.
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