---
id: CVE-2026-89440
title: 'mmc: via-sdmmc: stop card-detect handling on probe failure'
summary: |-
  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…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-825
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 63400da6cd37a9793c19bb6aed7131b58b975a04 <
    5bb5327b92aae17e91c7228953c350a6ee3c94e8
  - >-
    Linux >= 0959cc1685eb19774300d43ef25e318b457b156b <
    d045596706d1b25d38af4a79980b017639fea9d1
  - >-
    Linux >= ba91b413983a9235792523c6b9f7ba2586c4d75d <
    806409f12fdb14c9e4c56a64494c9b75f356cd49
  - >-
    Linux >= e4e46fb61e3bb4628170810d3f2b996b709b90d9 <
    dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02
  - >-
    Linux >= e4e46fb61e3bb4628170810d3f2b996b709b90d9 <
    efe7f25dd27e35063477b4b0e7eed3675669fd99
  - >-
    Linux >= e4e46fb61e3bb4628170810d3f2b996b709b90d9 <
    2550f89589caad7402d618d7dffc038582c94b6b
  - >-
    Linux >= e4e46fb61e3bb4628170810d3f2b996b709b90d9 <
    c2b8a624911999399cc14822fec3e35032b3cee4
  - >-
    Linux >= e4e46fb61e3bb4628170810d3f2b996b709b90d9 <
    088eaa92fcebaa6b957ccf9635afdf39643a577d
  - Linux 076bcd2c93e16b05c10564e299d6e5d26a766d00
  - Linux 12b8e81b77c05c658efd9cde3585bbd65ae39b59
  - Linux 95025a8dd0ec015872f6c16473fe04d6264e68ca
  - Linux f59ef2a47a228e51322ad76752a55a8917c56e38
  - Linux 0ec94795114edc7e24ec71849dce42bfa61dafa3
  - Linux >= 5.10.163 < 5.10.270
  - Linux >= 5.15.86 < 5.15.221
  - Linux >= 6.1.2 < 6.1.188
  - Linux >= 4.9.337 < 4.10
  - Linux >= 4.14.303 < 4.15
  - Linux >= 4.19.270 < 4.20
  - Linux >= 5.4.229 < 5.5
  - Linux >= 6.0.16 < 6.1
  - Linux 6.2
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:46:49.770Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89440'
references:
  - url: 'https://git.kernel.org/stable/c/5bb5327b92aae17e91c7228953c350a6ee3c94e8'
  - url: 'https://git.kernel.org/stable/c/d045596706d1b25d38af4a79980b017639fea9d1'
  - url: 'https://git.kernel.org/stable/c/806409f12fdb14c9e4c56a64494c9b75f356cd49'
  - url: 'https://git.kernel.org/stable/c/dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02'
  - url: 'https://git.kernel.org/stable/c/efe7f25dd27e35063477b4b0e7eed3675669fd99'
  - url: 'https://git.kernel.org/stable/c/2550f89589caad7402d618d7dffc038582c94b6b'
  - url: 'https://git.kernel.org/stable/c/c2b8a624911999399cc14822fec3e35032b3cee4'
  - url: 'https://git.kernel.org/stable/c/088eaa92fcebaa6b957ccf9635afdf39643a577d'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89440.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89440'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532121'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89440'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89440'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89440.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00169
epssPercentile: 0.06186
scores:
  cna: 7.8
  vendor: 7
ingestedAt: '2026-09-14T15:23:07.454Z'
---

## Overview

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

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89440.json)