CVE-2026-89440

In the Linux kernel, the following vulnerability has been resolved: mmc: via-sdmmc: stop card-detect handling on probe failure request_irq() registers the SD card-detect interrupt and the probe enables it before mmc_add_host() runs. If mmc_add_host() fails, the error path only unmaps the registers and returns: the interrupt stays registered, so the handler keeps running against the host once it is freed. via_sdc_isr() dereferences sdhost and its MMIO base and schedules carddet_work, which via_sdc_card_detect() also runs against freed memory through its container_of() dereference. Add a probe-error path that disables and frees the interrupt and cancels carddet_work before unmapping. carddet_work can re-enable the device interrupt via via_reset_pcictrl(), which restores PCIINTCTRL, so mask it again after cancelling the work. This issue was found by an in-house static analysis tool and confirmed by manual code review.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/088eaa92fcebaa6b957ccf9635afdf39643a577d
https://git.kernel.org/stable/c/2550f89589caad7402d618d7dffc038582c94b6b
https://git.kernel.org/stable/c/5bb5327b92aae17e91c7228953c350a6ee3c94e8
https://git.kernel.org/stable/c/806409f12fdb14c9e4c56a64494c9b75f356cd49
https://git.kernel.org/stable/c/c2b8a624911999399cc14822fec3e35032b3cee4
https://git.kernel.org/stable/c/d045596706d1b25d38af4a79980b017639fea9d1
https://git.kernel.org/stable/c/dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02
https://git.kernel.org/stable/c/efe7f25dd27e35063477b4b0e7eed3675669fd99

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-11 20:19

Updated : 2026-09-14 13:19

NVD link : CVE-2026-89440

Mitre link : CVE-2026-89440

CVE.ORG link : CVE-2026-89440

JSON object : View

Products Affected

No product.

CWE

No CWE.

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If mmc_add_host() fails, the error path only\nunmaps the registers and returns: the interrupt stays registered, so the\nhandler keeps running against the host once it is freed. via_sdc_isr()\ndereferences sdhost and its MMIO base and schedules carddet_work, which\nvia_sdc_card_detect() also runs against freed memory through its\ncontainer_of() dereference.\n\nAdd a probe-error path that disables and frees the interrupt and cancels\ncarddet_work before unmapping. carddet_work can re-enable the device\ninterrupt via via_reset_pcictrl(), which restores PCIINTCTRL, so mask it\nagain after cancelling the work.\n\nThis issue was found by an in-house static analysis tool and confirmed by\nmanual code review."}], "lastModified": "2026-09-14T13:19:01.230", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}