CVE-2026-97481
Description
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.
How to fix
- Linux Linux4bce4a6f6318035d77d6b6199527b1950bb015f4, 8b67af8cd90542b2607623e3282811849e191b79, 95d0b40c0623fd2b58c753f8dd6adda7263e3cd1, 03ed804a0ddc3d069faf94c47f9e702afe5ca084, 2881b2e6da02daea1eb8254247ba8fd20c9d3348, 4295c58990b7a84e8349a2226db692e252825b60, 0c6bf45e5a345cc3b9ffbeaf9083ecac3c2293eb or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 4bce4a6f6318035d77d6b6199527b1950bb015f4, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 8b67af8cd90542b2607623e3282811849e191b79, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 95d0b40c0623fd2b58c753f8dd6adda7263e3cd1, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 03ed804a0ddc3d069faf94c47f9e702afe5ca084, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 2881b2e6da02daea1eb8254247ba8fd20c9d3348, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 4295c58990b7a84e8349a2226db692e252825b60, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 0c6bf45e5a345cc3b9ffbeaf9083ecac3c2293eb, 2.6.12 | 4bce4a6f6318035d77d6b6199527b1950bb015f4, 8b67af8cd90542b2607623e3282811849e191b79, 95d0b40c0623fd2b58c753f8dd6adda7263e3cd1, 03ed804a0ddc3d069faf94c47f9e702afe5ca084, 2881b2e6da02daea1eb8254247ba8fd20c9d3348, 4295c58990b7a84e8349a2226db692e252825b60, 0c6bf45e5a345cc3b9ffbeaf9083ecac3c2293eb |
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