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NVD / CVE Program· CNA Linux

CVE-2026-43432: usb: xhci: Fix memory leak in xhci_disable_slot()

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: 0.12% (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 078b446efc0f5e496c31bccb72b98af979963a83, 1e800e26d54ccf2ddf2ea6d6cbe021c804d8aa62, 2e2baa8fb5aa4d080cbfeb84c51eff797529f413.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 078b446efc0f5e496c31bccb72b98af979963a83, 1e800e26d54ccf2ddf2ea6d6cbe021c804d8aa62, 2e2baa8fb5aa4d080cbfeb84c51eff797529f413 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: xhci: Fix memory leak in xhci_disable_slot() xhci_alloc_command() allocates a command structure and, when the second argument is true, also allocates a completion structure. Currently, the error handling path in xhci_disable_slot() only frees the command structure using kfree(), causing the completion structure to leak. Use xhci_free_command() instead of kfree(). xhci_free_command() correctly frees both the command structure and the associated completion structure. Since the command structure is allocated with zero-initialization, command->in_ctx is NULL and will not be erroneously freed by xhci_free_command(). This bug was found using an experimental static analysis tool we are developing. The tool is based on the LLVM framework and is specifically designed to detect memory management issues. It is currently under active development and not yet publicly available, but we plan to open-source it after our research is published. The bug was originally detected on v6.13-rc1 using our static analysis tool, and we have verified that the issue persists in the latest mainline kernel. We performed build testing on x86_64 with allyesconfig using GCC=11.4.0. Since triggering these error paths in xhci_disable_slot() requires specific hardware conditions or abnormal state, we were unable to construct a test case to reliably trigger these specific error paths at runtime.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 8, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 2th percentile

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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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-2026-43432

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.

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 kernel4.19.221 and later · before 4.20
  • linux linux kernel5.4.165 and later · before 5.5
  • linux linux kernel5.10.85 and later · before 5.10.253
  • linux linux kernel5.15.8 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.167
  • linux linux kernel6.2 and later · before 6.6.130
  • linux linux kernel6.7 and later · before 6.12.78
  • linux linux kernel6.13 and later · before 6.18.19
  • linux linux kernel6.19 and later · before 6.19.9
  • linux linux kernel7.0

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

    • cc7c2818c71ebace207df40cc586c8c74e3d1a59, ec0cddcc2454ab08193beb473978f8f8889b7e24, 5.16affected
    • fee8be5bde562d4f5f9a100ca80c6d7072ed34c8 and later · before 1e800e26d54ccf2ddf2ea6d6cbe021c804d8aa62affected · git
    • 02d5a2a48bb44e7404b794df87e57588b2fd604e and later · before 6288baf0c8c4dcfbf206773aede9c1f2269cec28affected · git
    • 7faac1953ed1f658f719cdf7bb7303fa5eef822c and later · before 46aea90763832cd6e9b0c2e1c00e6a9512156d4baffected · git
    • 7faac1953ed1f658f719cdf7bb7303fa5eef822c and later · before 2e2baa8fb5aa4d080cbfeb84c51eff797529f413affected · git
    • 7faac1953ed1f658f719cdf7bb7303fa5eef822c and later · before 807e4fb5140c73eb5dba1e399a990db5c1f3cdf8affected · git
    • 7faac1953ed1f658f719cdf7bb7303fa5eef822c and later · before c65f1b840ab8ce72ba68f1b63bab7960f8fdfa89affected · git
    • 7faac1953ed1f658f719cdf7bb7303fa5eef822c and later · before 078b446efc0f5e496c31bccb72b98af979963a83affected · git
    • 7faac1953ed1f658f719cdf7bb7303fa5eef822c and later · before c1c8550e70401159184130a1afc6261db01fc0ceaffected · git
    • 5.10.85 and later · before 5.10.253affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.10-16.19.10-1

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-2026-43428May 8, 2026 · USB: core: Limit the length of unkillable synchronous timeouts
    22Monitor
  • ← EarlierCVE-2026-43429May 8, 2026 · USB: usbtmc: Use usb_bulk_msg_killable() with user-specified timeouts
    22Monitor
  • Later →CVE-2026-43436May 8, 2026 · ALSA: usb-audio: Check endpoint numbers at parsing Scarlett2 mixer interfaces
    22Monitor

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 Linux078b446efc0f5e496c31bccb72b98af979963a83Vendor (CNA)
Linux Linux1e800e26d54ccf2ddf2ea6d6cbe021c804d8aa62Vendor (CNA)
Linux Linux2e2baa8fb5aa4d080cbfeb84c51eff797529f413Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux46aea90763832cd6e9b0c2e1c00e6a9512156d4bVendor (CNA)
Linux Linux5.10.253Vendor (CNA)
Linux Linux5.15.203Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux6288baf0c8c4dcfbf206773aede9c1f2269cec28Vendor (CNA)
Linux Linux807e4fb5140c73eb5dba1e399a990db5c1f3cdf8Vendor (CNA)
Linux Linuxc1c8550e70401159184130a1afc6261db01fc0ceVendor (CNA)
Linux Linuxc65f1b840ab8ce72ba68f1b63bab7960f8fdfa89Vendor (CNA)
debian:linux6.1.170-1 · 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.

No history yet (it accumulates with the daily EPSS job).

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).

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
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)

CWE-401 · Missing Release of Memory after Effective Lifetime

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. SSVC exploitation— → none
  2. 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