CVE-2026-98208: Linux kernel · mmc: sdio_uart: fix xmit_fifo leak when the port table is full
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:27 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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.
References
- ubuntu.com/security/CVE-2026-98208 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98208 (opens in a new tab)
- git.kernel.org/linus/53823e25793a97d07e6e98e0904bbf74cac8bc76 (opens in a new tab)
- git.kernel.org/stable/c/53823e25793a97d07e6e98e0904bbf74cac8bc76 (opens in a new tab)
- git.kernel.org/stable/c/5e142adbbdc54afbd01fad476c91cded41d22594 (opens in a new tab)
- git.kernel.org/stable/c/72f4c2b7a48423c708f2c348585419a1b71ab04c (opens in a new tab)
- git.kernel.org/stable/c/8a2c1bf209ba04cbd14153a771724bd5aa522fcd (opens in a new tab)
- git.kernel.org/stable/c/9e992d59138fcfaa4bad7cc0750265b0a8bca100 (opens in a new tab)
- git.kernel.org/stable/c/ac866db277a4c73e84b4263773652e3aba326249 (opens in a new tab)
- git.kernel.org/stable/c/b97b5b66c93cb4aaf6358727a73fff880a774dfd (opens in a new tab)
- git.kernel.org/stable/c/fd8223c53ad9553b2a349d2a40e19bbc6e60fc48 (opens in a new tab)