What’s Vulnerable › Vulnerabilities

CVE-2026-98208: mmc: sdio_uart: fix xmit_fifo leak when the port table is full

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: mmc: sdio_uart: fix xmit_fifo leak when the port table is full sdio_uart_add_port() allocates the transmit fifo before claiming a slot in sdio_uart_table[]. When all UART_NR slots are taken, it returns -EBUSY with the fifo still allocated, but the probe error path only kfree()s the port, leaking the transmit fifo. Free the fifo in the failure path of sdio_uart_add_port() itself so the function retains nothing on error.

Affected products

• Linux kernel: 2.6.34 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/53823e25793a97d07e6e98e0904bbf74cac8bc76
• https://git.kernel.org/stable/c/5e142adbbdc54afbd01fad476c91cded41d22594
• https://git.kernel.org/stable/c/72f4c2b7a48423c708f2c348585419a1b71ab04c
• https://git.kernel.org/stable/c/8a2c1bf209ba04cbd14153a771724bd5aa522fcd
• https://git.kernel.org/stable/c/9e992d59138fcfaa4bad7cc0750265b0a8bca100
• https://git.kernel.org/stable/c/ac866db277a4c73e84b4263773652e3aba326249
• https://git.kernel.org/stable/c/b97b5b66c93cb4aaf6358727a73fff880a774dfd
• https://git.kernel.org/stable/c/fd8223c53ad9553b2a349d2a40e19bbc6e60fc48

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