CVE-2026-89441

mmc: via-sdmmc: cancel card-detect work on remove

Published Sep 11, 2026 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Description

In the Linux kernel, the following vulnerability has been resolved:

mmc: via-sdmmc: cancel card-detect work on remove

Disabling the device interrupt and freeing the IRQ prevents new card-detect
work from being queued, but carddet_work already queued by the handler can
still run after via_sd_remove() returns. via_sdc_card_detect() recovers the
host through container_of() and dereferences its MMIO base; once remove()
returns the host can be freed, so that work would touch freed memory.

Cancel carddet_work after freeing the IRQ and before cancelling
finish_bh_work, which the card-detect handler can also queue. carddet_work
can re-enable the interrupt through via_reset_pcictrl(); mask it again
afterwards.

This issue was found by an in-house static analysis tool and confirmed by
manual code review.

Analysis

Technical impact

A flaw in the Linux kernel’s via‑sdmmc driver causes pending card‑detect work to be left queued after a device is removed. The queued work continues to run even though the host structure has already been freed, causing the driver to dereference a freed MMIO base. This kernel‑space use‑after‑free can corrupt memory or redirect execution, potentially allowing local privilege escalation or a denial‑of‑service crash. The vulnerability is very likely triggered by local or physical actions such as a user or attacker removing and reinserting an SD/MMC card during system operation. The CVE documentation specifies that the weakness is of type CWE‑825.

Affected Systems

The flaw affects any system running a Linux kernel that includes the via‑sdmmc driver prior to the fix introduced by commit 57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5 and its subsequent commits. All distributions, embedded systems, and appliances that ship the default kernel tree with this driver are vulnerable. Devices that support SD/MMC via a PCI controller experience the risk whenever a card is removed or reinserted while the system is running.

Risk and Exploitability

The CVSS score of 7.8 indicates a high‑severity local vulnerability. The EPSS score is below 1%, implying a very low probability of exploitation in the wild. The vulnerability is not listed in CISA KEV. Attackers need local or physical access to trigger the flaw by removing and reinserting a card or by executing privileged code that calls via_sd_remove(). If exploited, the attacker could corrupt kernel memory, crash the system, or gain elevated privileges.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`f0bf7f61b8405224bc52fc9a3ccd167a68126e00`	affected	< 28e8e9e1f3bdb75b611ea14c39775455528c4012
`f0bf7f61b8405224bc52fc9a3ccd167a68126e00`	affected	< a32603f9b4dd0a1c3ea5845eec7c95f5f8741b3d
`f0bf7f61b8405224bc52fc9a3ccd167a68126e00`	affected	< 3ee1b5c8618a26811840bf9f45cb3120dac1e273
`f0bf7f61b8405224bc52fc9a3ccd167a68126e00`	affected	< 55d71c70f11d9f92c7d2653774001e98cb509deb
`f0bf7f61b8405224bc52fc9a3ccd167a68126e00`	affected	< 0a3c70191868fb007c03ff79693ad4e4b3fdcbb8
`f0bf7f61b8405224bc52fc9a3ccd167a68126e00`	affected	< f7ff3027ef004a331ef911a4886f12bc2e996037
`f0bf7f61b8405224bc52fc9a3ccd167a68126e00`	affected	< eaca730c6f5e3609df62a0469fb789235a93d276
`f0bf7f61b8405224bc52fc9a3ccd167a68126e00`	affected	< 57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5

Linux

affected

Version	Status	Constraints
`2.6.31`	affected	—
`0`	unaffected	< 2.6.31
`5.10.273`	unaffected	≤ 5.10.*
`5.15.224`	unaffected	≤ 5.15.*
`6.1.191`	unaffected	≤ 6.1.*
`6.6.160`	unaffected	≤ 6.6.*
`6.12.112`	unaffected	≤ 6.12.*
`6.18.50`	unaffected	≤ 6.18.*
`7.2.4`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[f0bf7f61b8405224bc52fc9a3ccd167a68126e00,f7ff3027ef004a331ef911a4886f12bc2e996037)`	affected	code_commit	—
`[f0bf7f61b8405224bc52fc9a3ccd167a68126e00,eaca730c6f5e3609df62a0469fb789235a93d276)`	affected	code_commit	—
`[f0bf7f61b8405224bc52fc9a3ccd167a68126e00,57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5)`	affected	code_commit	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`2.6.31`	affected	semver	—
`[0,2.6.31)`	unaffected	semver	—
`[6.18.50,6.19.0)`	unaffected	semver	—
`[7.2.4,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	generic	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Apply a kernel update that includes the via‑sdmmc patch from commit 57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5.
If the system does not require SD/MMC support, disable or unload the via_sdcmmc driver before performing any hot removal operations.
Avoid removing or reinserting SD/MMC cards during normal operation; schedule card removals during maintenance windows and reboot the system to ensure any pending kernel work is cleared.

Generated by OpenCVE AI on September 21, 2026 at 02:10 UTC.

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4850-1	linux-6.12 security update
Debian DSA	DSA-6568-1	linux security update
Ubuntu USN	USN-9002-1	Linux kernel (NVIDIA Tegra) vulnerabilities
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9022-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9023-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9024-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9025-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9026-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9039-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-9040-1	Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN	USN-9066-1	Linux kernel (HWE) vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.130% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://git.kernel.org/stable/c/0a3c70191868fb007c03ff79693ad4e4b3fdcbb8
https://git.kernel.org/stable/c/28e8e9e1f3bdb75b611ea14c39775455528c4012
https://git.kernel.org/stable/c/3ee1b5c8618a26811840bf9f45cb3120dac1e273
https://git.kernel.org/stable/c/55d71c70f11d9f92c7d2653774001e98cb509deb
https://git.kernel.org/stable/c/57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5
https://git.kernel.org/stable/c/a32603f9b4dd0a1c3ea5845eec7c95f5f8741b3d
https://git.kernel.org/stable/c/eaca730c6f5e3609df62a0469fb789235a93d276
https://git.kernel.org/stable/c/f7ff3027ef004a331ef911a4886f12bc2e996037
https://nvd.nist.gov/vuln/detail/CVE-2026-89441
https://www.cve.org/CVERecord?id=CVE-2026-89441

History

Oct 30, 2026 12:45 PM Added references View changes

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/28e8e9e1f3bdb75b611ea14c39775455528c4012 https://git.kernel.org/stable/c/3ee1b5c8618a26811840bf9f45cb3120dac1e273 https://git.kernel.org/stable/c/a32603f9b4dd0a1c3ea5845eec7c95f5f8741b3d

Oct 21, 2026 1:00 PM Added references View changes

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/55d71c70f11d9f92c7d2653774001e98cb509deb

Oct 16, 2026 8:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Oct 3, 2026 11:15 AM Added references View changes

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/0a3c70191868fb007c03ff79693ad4e4b3fdcbb8

Sep 13, 2026 6:45 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	cvssV3_1 `{'score': 4.1, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H'}`	cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

Sep 12, 2026 12:15 PM Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-825
References		https://nvd.nist.gov/vuln/detail/CVE-2026-89441 https://www.cve.org/CVERecord?id=CVE-2026-89441
Metrics	threat_severity `None`	cvssV3_1 `{'score': 4.1, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Moderate`

Sep 11, 2026 11:45 PM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: mmc: via-sdmmc: cancel card-detect work on remove Disabling the device interrupt and freeing the IRQ prevents new card-detect work from being queued, but carddet_work already queued by the handler can still run after via_sd_remove() returns. via_sdc_card_detect() recovers the host through container_of() and dereferences its MMIO base; once remove() returns the host can be freed, so that work would touch freed memory. Cancel carddet_work after freeing the IRQ and before cancelling finish_bh_work, which the card-detect handler can also queue. carddet_work can re-enable the interrupt through via_reset_pcictrl(); mask it again afterwards. This issue was found by an in-house static analysis tool and confirmed by manual code review.
Title		mmc: via-sdmmc: cancel card-detect work on remove
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5 https://git.kernel.org/stable/c/eaca730c6f5e3609df62a0469fb789235a93d276 https://git.kernel.org/stable/c/f7ff3027ef004a331ef911a4886f12bc2e996037