# CVE-2026-89440

## Summary

- **CVE ID:** CVE-2026-89440
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## 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.

## Affected Products

- Linux — Linux (e4e46fb61e3bb4628170810d3f2b996b709b90d9)
- Linux — Linux (076bcd2c93e16b05c10564e299d6e5d26a766d00)
- Linux — Linux (12b8e81b77c05c658efd9cde3585bbd65ae39b59)
- Linux — Linux (95025a8dd0ec015872f6c16473fe04d6264e68ca)
- Linux — Linux (f59ef2a47a228e51322ad76752a55a8917c56e38)
- Linux — Linux (63400da6cd37a9793c19bb6aed7131b58b975a04)
- Linux — Linux (0959cc1685eb19774300d43ef25e318b457b156b)
- Linux — Linux (0ec94795114edc7e24ec71849dce42bfa61dafa3)
- Linux — Linux (ba91b413983a9235792523c6b9f7ba2586c4d75d)
- Linux — Linux (4.9.337)
- Linux — Linux (4.14.303)
- Linux — Linux (4.19.270)
- Linux — Linux (5.4.229)
- Linux — Linux (5.10.163)
- Linux — Linux (5.15.86)
- Linux — Linux (6.0.16)
- Linux — Linux (6.1.2)
- Linux — Linux (6.2)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (5.10.270)
- Linux — Linux (5.15.221)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/efe7f25dd27e35063477b4b0e7eed3675669fd99)
- [CNA](https://git.kernel.org/stable/c/2550f89589caad7402d618d7dffc038582c94b6b)
- [CNA](https://git.kernel.org/stable/c/c2b8a624911999399cc14822fec3e35032b3cee4)
- [CNA](https://git.kernel.org/stable/c/088eaa92fcebaa6b957ccf9635afdf39643a577d)
- [CNA](https://git.kernel.org/stable/c/5bb5327b92aae17e91c7228953c350a6ee3c94e8)
- [CNA](https://git.kernel.org/stable/c/d045596706d1b25d38af4a79980b017639fea9d1)
- [CNA](https://git.kernel.org/stable/c/806409f12fdb14c9e4c56a64494c9b75f356cd49)
- [CNA](https://git.kernel.org/stable/c/dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 6.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._