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CVE-2026-89441

7.8 · HIGH

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 w…

Published Sep 11, 2026EPSS 0.13%

Overview

CVE-2026-89441 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0a3c70191868fb007c03ff79693ad4e4b3fdcbb8Refgit.kernel.org/stable/c/28e8e9e1f3bdb75b611ea14c39775455528c4012Refgit.kernel.org/stable/c/3ee1b5c8618a26811840bf9f45cb3120dac1e273Refgit.kernel.org/stable/c/55d71c70f11d9f92c7d2653774001e98cb509debRefgit.kernel.org/stable/c/57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5Refgit.kernel.org/stable/c/a32603f9b4dd0a1c3ea5845eec7c95f5f8741b3dRefgit.kernel.org/stable/c/eaca730c6f5e3609df62a0469fb789235a93d276Refgit.kernel.org/stable/c/f7ff3027ef004a331ef911a4886f12bc2e996037

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89441?

CVE-2026-89441 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89441?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-89441?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-89441?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89441 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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