CVE-2026-89440: Linux Vulnerability (CVSS 7.8)

Description

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.16%

5.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 63400da6cd37a9793c19bb6aed7131b58b975a04, < 5bb5327b92aae17e91c7228953c350a6ee3c94e8; >= 0959cc1685eb19774300d43ef25e318b457b156b, < d045596706d1b25d38af4a79980b017639fea9d1; >= ba91b413983a9235792523c6b9f7ba2586c4d75d, < 806409f12fdb14c9e4c56a64494c9b75f356cd49; >= e4e46fb61e3bb4628170810d3f2b996b709b90d9, < dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02; >= e4e46fb61e3bb4628170810d3f2b996b709b90d9, < efe7f25dd27e35063477b4b0e7eed3675669fd99; >= e4e46fb61e3bb4628170810d3f2b996b709b90d9, < 2550f89589caad7402d618d7dffc038582c94b6b; >= e4e46fb61e3bb4628170810d3f2b996b709b90d9, < c2b8a624911999399cc14822fec3e35032b3cee4; >= e4e46fb61e3bb4628170810d3f2b996b709b90d9, < 088eaa92fcebaa6b957ccf9635afdf39643a577d; 076bcd2c93e16b05c10564e299d6e5d26a766d00; 12b8e81b77c05c658efd9cde3585bbd65ae39b59; 95025a8dd0ec015872f6c16473fe04d6264e68ca; f59ef2a47a228e51322ad76752a55a8917c56e38; 0ec94795114edc7e24ec71849dce42bfa61dafa3; >= 5.10.163, < 5.10.270; >= 5.15.86, < 5.15.221; >= 6.1.2, < 6.1.188; >= 4.9.337, < 4.10; >= 4.14.303, < 4.15; >= 4.19.270, < 4.20; >= 5.4.229, < 5.5; >= 6.0.16, < 6.1
Linux	Linux	6.2

References

Timeline

Published: Sep 11, 2026
Last Modified: Sep 14, 2026
Status: Received

Frequently Asked Questions

What is 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.

How severe is CVE-2026-89440?

CVE-2026-89440 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.

How do I fix CVE-2026-89440?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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