CVE-2026-97481 is a vulnerability in Linux Kernel
Published on September 24, 2026
serial: 8250: fix possible ISR soft lockup
In the Linux kernel, the following vulnerability has been resolved:
serial: 8250: fix possible ISR soft lockup
There are rare cases in which the host gets stuck in the ISR because it
is flooded with messages during the startup phase.
The reason for the soft lockup in the ISR is the missing FIFO error IRQ
(FIFOE) handling. Not handling it and reporting IRQ_HANDLED triggers
the IRQ immediately again.
Fix this by adding a check for the FIFOE status and clearing the FIFO
if no data is ready (DR).
This behavior was observed on an AM62L device which uses the OMAP 8250
driver. Fix it for all 8250 drivers, since the OMAP driver's special
IRQ setup handling may trigger this behavior more frequently, but it
is not ensured that other 8250 drivers aren't affected.
Products Associated with CVE-2026-97481
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 2881b2e6da02daea1eb8254247ba8fd20c9d3348 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 4295c58990b7a84e8349a2226db692e252825b60 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 0c6bf45e5a345cc3b9ffbeaf9083ecac3c2293eb is affected.
- Before 6.12.111 is affected.
- Before 6.18.53 is affected.
- Version 6.12.111, <= 6.12.* is unaffected.
- Version 6.18.53, <= 6.18.* is unaffected.
- Version 7.2, <= * is unaffected.