What’s Vulnerable › Vulnerabilities

CVE-2026-89441: mmc: via-sdmmc: cancel card-detect work on remove

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: mmc: via-sdmmc: cancel card-detect work on remove Disabling the device interrupt and freeing the IRQ prevents new card-detect work from being queued, but carddet_work already queued by the handler can still run after via_sd_remove() returns. via_sdc_card_detect() recovers the host through container_of() and dereferences its MMIO base; once remove() returns the host can be freed, so that work would touch freed memory. Cancel carddet_work after freeing the IRQ and before cancelling finish_bh_work, which the card-detect handler can also queue. carddet_work can re-enable the interrupt through via_reset_pcictrl(); mask it again afterwards. This issue was found by an in-house static analysis tool and confirmed by manual code review.

Affected products

• Linux: 2.6.31 — fixed in 7.3

How to fix

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

References

• https://git.kernel.org/stable/c/0a3c70191868fb007c03ff79693ad4e4b3fdcbb8
• https://git.kernel.org/stable/c/28e8e9e1f3bdb75b611ea14c39775455528c4012
• https://git.kernel.org/stable/c/3ee1b5c8618a26811840bf9f45cb3120dac1e273
• https://git.kernel.org/stable/c/55d71c70f11d9f92c7d2653774001e98cb509deb
• https://git.kernel.org/stable/c/57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5
• https://git.kernel.org/stable/c/a32603f9b4dd0a1c3ea5845eec7c95f5f8741b3d
• https://git.kernel.org/stable/c/eaca730c6f5e3609df62a0469fb789235a93d276
• https://git.kernel.org/stable/c/f7ff3027ef004a331ef911a4886f12bc2e996037

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