High

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

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.

Published Sep 11, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1
Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.17%

ahead of 6% of scored CVEs · Oct 15, 2026

Affects

Linux

CVSS base

7.8

High · 2 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	version f59ef2a47a228e51322ad76752a55a8917c56e38version 6.2≥ 6.0.16 and < 6.1≥ 5.4.229 and < 5.5≥ 4.19.270 and < 4.20≥ 4.14.303 and < 4.15≥ 4.9.337 and < 4.10≥ 6.1.2 and < 6.1.188 and 14 more ≥ 5.15.86 and < 5.15.221≥ 5.10.163 and < 5.10.270version 0ec94795114edc7e24ec71849dce42bfa61dafa3≥ 63400da6cd37a9793c19bb6aed7131b58b975a04 and < 5bb5327b92aae17e91c7228953c350a6ee3c94e8version 95025a8dd0ec015872f6c16473fe04d6264e68caversion 12b8e81b77c05c658efd9cde3585bbd65ae39b59version 076bcd2c93e16b05c10564e299d6e5d26a766d00≥ e4e46fb61e3bb4628170810d3f2b996b709b90d9 and < 088eaa92fcebaa6b957ccf9635afdf39643a577d≥ e4e46fb61e3bb4628170810d3f2b996b709b90d9 and < c2b8a624911999399cc14822fec3e35032b3cee4≥ e4e46fb61e3bb4628170810d3f2b996b709b90d9 and < 2550f89589caad7402d618d7dffc038582c94b6b≥ e4e46fb61e3bb4628170810d3f2b996b709b90d9 and < efe7f25dd27e35063477b4b0e7eed3675669fd99≥ e4e46fb61e3bb4628170810d3f2b996b709b90d9 and < dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02≥ ba91b413983a9235792523c6b9f7ba2586c4d75d and < 806409f12fdb14c9e4c56a64494c9b75f356cd49≥ 0959cc1685eb19774300d43ef25e318b457b156b and < d045596706d1b25d38af4a79980b017639fea9d1	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.8	CVSS 3.1	High	1.8	5.9	416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database
7.8	CVSS 3.1	High	—	—	Linux via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67)

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.

endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 7.8
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 11, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/2550f89589caad7402d618d7dffc038582c94b6b
NIST National Vulnerability Database
git.kernel.org/stable/c/d045596706d1b25d38af4a79980b017639fea9d1
NIST National Vulnerability Database
git.kernel.org/stable/c/5bb5327b92aae17e91c7228953c350a6ee3c94e8
NIST National Vulnerability Database
git.kernel.org/stable/c/efe7f25dd27e35063477b4b0e7eed3675669fd99
NIST National Vulnerability Database
git.kernel.org/stable/c/806409f12fdb14c9e4c56a64494c9b75f356cd49
NIST National Vulnerability Database
git.kernel.org/stable/c/dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02
NIST National Vulnerability Database
git.kernel.org/stable/c/c2b8a624911999399cc14822fec3e35032b3cee4
NIST National Vulnerability Database
git.kernel.org/stable/c/088eaa92fcebaa6b957ccf9635afdf39643a577d
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 1d
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 1d
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 2d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 2d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 2d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-89440 is "mmc: via-sdmmc: stop card-detect handling on probe failure", rated High. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.8 describes technical severity. EPSS 0.17% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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