CVE-2026-89440 Linux Kernel mmc via-sdmmc - Use After Free

Linux kernel mmc via-sdmmc contains a use-after-free vulnerability caused by improper interrupt handling on probe failure, letting attackers cause kernel memory corruption, exploit requires triggering probe failure.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Use After Free
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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