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NVD / CVE Program· CNA Linux

CVE-2026-89440: mmc: via-sdmmc: stop card-detect handling on probe failure

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 088eaa92fcebaa6b957ccf9635afdf39643a577d, 2550f89589caad7402d618d7dffc038582c94b6b, 4.10.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 088eaa92fcebaa6b957ccf9635afdf39643a577d, 2550f89589caad7402d618d7dffc038582c94b6b, 4.10 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 11, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 076bcd2c93e16b05c10564e299d6e5d26a766d00, 12b8e81b77c05c658efd9cde3585bbd65ae39b59, 95025a8dd0ec015872f6c16473fe04d6264e68ca, f59ef2a47a228e51322ad76752a55a8917c56e38, 0ec94795114edc7e24ec71849dce42bfa61dafa3, 6.2affected
    • 63400da6cd37a9793c19bb6aed7131b58b975a04 and later · before 5bb5327b92aae17e91c7228953c350a6ee3c94e8affected · git
    • 0959cc1685eb19774300d43ef25e318b457b156b and later · before d045596706d1b25d38af4a79980b017639fea9d1affected · git
    • ba91b413983a9235792523c6b9f7ba2586c4d75d and later · before 806409f12fdb14c9e4c56a64494c9b75f356cd49affected · git
    • e4e46fb61e3bb4628170810d3f2b996b709b90d9 and later · before dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02affected · git
    • e4e46fb61e3bb4628170810d3f2b996b709b90d9 and later · before efe7f25dd27e35063477b4b0e7eed3675669fd99affected · git
    • e4e46fb61e3bb4628170810d3f2b996b709b90d9 and later · before 2550f89589caad7402d618d7dffc038582c94b6baffected · git
    • e4e46fb61e3bb4628170810d3f2b996b709b90d9 and later · before c2b8a624911999399cc14822fec3e35032b3cee4affected · git
    • e4e46fb61e3bb4628170810d3f2b996b709b90d9 and later · before 088eaa92fcebaa6b957ccf9635afdf39643a577daffected · git
    • 5.10.163 and later · before 5.10.270affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-89438Sep 11, 2026 · platform/x86: ISST: Validate logical CPU id and clos id
    0Monitor
  • ← EarlierCVE-2026-89439Sep 11, 2026 · platform/x86: ISST: Add a NULL check for sst_inst[]
    0Monitor
  • Later →CVE-2026-89441Sep 11, 2026 · mmc: via-sdmmc: cancel card-detect work on remove
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux088eaa92fcebaa6b957ccf9635afdf39643a577dVendor (CNA)
Linux Linux2550f89589caad7402d618d7dffc038582c94b6bVendor (CNA)
Linux Linux4.10Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux5.10.270Vendor (CNA)
Linux Linux5.15.221Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5bb5327b92aae17e91c7228953c350a6ee3c94e8Vendor (CNA)
Linux Linux6.1Vendor (CNA)
Linux Linux6.1.188Vendor (CNA)
Linux Linux806409f12fdb14c9e4c56a64494c9b75f356cd49Vendor (CNA)
Linux Linuxc2b8a624911999399cc14822fec3e35032b3cee4Vendor (CNA)
Linux Linuxd045596706d1b25d38af4a79980b017639fea9d1Vendor (CNA)
Linux Linuxdde5b9c91e9fc64e54a2f186d3ae95868b4dbb02Vendor (CNA)
Linux Linuxefe7f25dd27e35063477b4b0e7eed3675669fd99Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records