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NVD / CVE Program· CNA Linux

CVE-2026-63897: USB: serial: mct_u232: fix missing interrupt-in transfer sanity check

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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 245aba83e3c288e176ed037a1f6b618b09e92ed8, 631b8b7c456567f7a8d26f6fc354c8dd9cc9f832, 70bb9a2661d34b93a9b83cf83e2b76289a712ef0.

Low priority for now. Upgrade to Linux Linux 245aba83e3c288e176ed037a1f6b618b09e92ed8, 631b8b7c456567f7a8d26f6fc354c8dd9cc9f832, 70bb9a2661d34b93a9b83cf83e2b76289a712ef0 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: USB: serial: mct_u232: fix missing interrupt-in transfer sanity check Add the missing sanity check on the size of interrupt-in transfers to avoid parsing stale or uninitialised slab data (and leaking it to user space).

Published
Jul 19, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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.

Follow CVE-2026-63897

When you'll hear from us

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  • 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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.12.1 and later · before 5.10.259
  • linux linux kernel5.11 and later · before 5.15.210
  • linux linux kernel5.16 and later · before 6.1.176
  • linux linux kernel6.2 and later · before 6.6.143
  • linux linux kernel6.7 and later · before 6.12.93
  • linux linux kernel6.13 and later · before 6.18.35
  • linux linux kernel6.19 and later · before 7.0.12
  • linux linux kernel2.6.12
  • linux linux kernel7.1

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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 82b48d70bced1ec8e5f676d1fd5eccc7a44dc418affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8b93ee5baeef6efabee2c3381907733ad2dbc883affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before a093f3e0c03d25a86d747a655d4b9322ffb2ed87affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 70bb9a2661d34b93a9b83cf83e2b76289a712ef0affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 631b8b7c456567f7a8d26f6fc354c8dd9cc9f832affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before f06bcaba29707f060706483b2020d3cafbe98f9faffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before ed260b56bc9fc878e5dcbb866eab8af0688e0e67affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 245aba83e3c288e176ed037a1f6b618b09e92ed8affected · git
    • before 2.6.12not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.12-17.0.12-1
SUSE:Linux Enterprise Live Patching 12 SP5kernel-defaultbefore 4.12.14-122.333.24.12.14-122.333.2
SUSE:Linux Enterprise Live Patching 12 SP5kgraft-patch-SLE12-SP5_Update_88before 1-8.3.31-8.3.3
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-sourcebefore 4.12.14-122.333.24.12.14-122.333.2
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-symsbefore 4.12.14-122.333.24.12.14-122.333.2

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-63889Jul 19, 2026 · scsi: scsi_transport_fc: Widen FPIN pname walker counter to u32
    32Monitor
  • ← EarlierCVE-2026-63893Jul 19, 2026 · thunderbolt: property: Reject u32 wrap in tb_property_entry_valid()
    32Monitor
  • Later →CVE-2026-63898Jul 19, 2026 · USB: serial: mct_u232: fix memory corruption with small endpoint
    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 Linux245aba83e3c288e176ed037a1f6b618b09e92ed8Vendor (CNA)
Linux Linux631b8b7c456567f7a8d26f6fc354c8dd9cc9f832Vendor (CNA)
Linux Linux70bb9a2661d34b93a9b83cf83e2b76289a712ef0Vendor (CNA)
Linux Linux82b48d70bced1ec8e5f676d1fd5eccc7a44dc418Vendor (CNA)
Linux Linux8b93ee5baeef6efabee2c3381907733ad2dbc883Vendor (CNA)
Linux Linuxa093f3e0c03d25a86d747a655d4b9322ffb2ed87Vendor (CNA)
Linux Linuxed260b56bc9fc878e5dcbb866eab8af0688e0e67Vendor (CNA)
Linux Linuxf06bcaba29707f060706483b2020d3cafbe98f9fVendor (CNA)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
suse:kernel-default4.12.14-122.333.2 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)
suse:kernel-source4.12.14-122.333.2 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-syms4.12.14-122.333.2 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_881-8.3.3 · SUSE:Linux Enterprise Live Patching 12 SP5Package 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.

—

Bug bounty scope

No known public program.

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

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

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

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. CVSS— → 5.5
  2. Severity— → medium
  3. 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