Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: mmc: mxcmmc: cancel data work and watchdog on remove mxcmci_remove() frees the host through the devm tail, but neither it nor mmc_remove_host() drains the driver's own asynchronous state. host->watchdog, a 10 s timer armed on the DMA path in mxcmci_setup_data(), is deleted only by the DMA- and IRQ-complete paths, which the remove path does not explicitly drain; it can therefore fire after the host is freed and dereference it in mxcmci_watchdog(). host->datawork, armed from the IRQ handler on the PIO path, is not cancelled by the remove path either. Free the devm-registered IRQ, then cancel datawork and delete the watchdog in mxcmci_remove(), before dma_release_channel(). Freeing the IRQ first keeps a trailing handler from re-arming datawork between the cancel and the host free. Both callbacks are non-self-rearming. This issue was found by an in-house static analysis tool.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund5 Oct 2026WID-SEC-2026-3743

  Linux Kernel: Multiple vulnerabilities Translated from German

  Risk mediumCVE-2026-98221CVE-2026-98181CVE-2026-98248+204 more CVEs

[ References ]References

• git.kernel.org/stable/c/23383e0578b58ba2dc0730cf9f7806bd66bf859a
• git.kernel.org/stable/c/314966b490323bdcfd3162a1398b00e587e0ced4
• git.kernel.org/stable/c/740f595f8ad678cb4d79f13edd12851df2492bdd
• git.kernel.org/stable/c/a1ff367e0dc961d73707add508a95df5c3509bd1
• git.kernel.org/stable/c/ae10838a7cdf0e54caa9d0a4f488704fd04e7f01
• git.kernel.org/stable/c/d3641afe6ee76d852834a34ef0669eefced32752
• git.kernel.org/stable/c/d3a421c82412344022982d5b91ba23194a0a6f29
• git.kernel.org/stable/c/e2948c4232209e87c861a680f20f1e3cf8a57fec