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NVD / CVE Program· CNA Linux

CVE-2023-53840: usb: early: xhci-dbc: Fix a potential out-of-bound memory access

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.24% (FIRST EPSS).
  • Fixed version: Linux Linux 351c8d8650d1ccc006255fa01f98b6c6496a02e5, a4a97ab3db5c081eb6e7dba91306adefb461e0bd, df7c8aba7309f4dc55df94e06b67f576c0f52406.

Low priority for now. Upgrade to Linux Linux 351c8d8650d1ccc006255fa01f98b6c6496a02e5, a4a97ab3db5c081eb6e7dba91306adefb461e0bd, df7c8aba7309f4dc55df94e06b67f576c0f52406 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: early: xhci-dbc: Fix a potential out-of-bound memory access If xdbc_bulk_write() fails, the values in 'buf' can be anything. So the string is not guaranteed to be NULL terminated when xdbc_trace() is called. Reserve an extra byte, which will be zeroed automatically because 'buf' is a static variable, in order to avoid troubles, should it happen.

—No exploit Fix available
Published
Dec 9, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 15th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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

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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.

—

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

    • 4.12affected
    • aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 and later · before e8fb0f13e45cf361fd06593d3cb2d89915cd3bd0affected · git
    • aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 and later · before 351c8d8650d1ccc006255fa01f98b6c6496a02e5affected · git
    • aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 and later · before df7c8aba7309f4dc55df94e06b67f576c0f52406affected · git
    • aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 and later · before a4a97ab3db5c081eb6e7dba91306adefb461e0bdaffected · git
    • before 4.12not affected · semver
    • 5.15.99 and later · up to and including 5.15.*not affected · semver
    • 6.1.16 and later · up to and including 6.1.*not affected · semver
    • 6.2.3 and later · up to and including 6.2.*not affected · semver
    • 6.3 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.20-16.1.20-1

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-2023-53838Dec 9, 2025 · f2fs: synchronize atomic write aborts
    31Monitor
  • ← EarlierCVE-2023-53839Dec 9, 2025 · dccp: fix data-race around dp->dccps_mss_cache
    0Monitor
  • Later →CVE-2023-53841Dec 9, 2025 · devlink: report devlink_port_type_warn source device
    0Monitor

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 Linux351c8d8650d1ccc006255fa01f98b6c6496a02e5Vendor (CNA)
Linux Linuxa4a97ab3db5c081eb6e7dba91306adefb461e0bdVendor (CNA)
Linux Linuxdf7c8aba7309f4dc55df94e06b67f576c0f52406Vendor (CNA)
Linux Linuxe8fb0f13e45cf361fd06593d3cb2d89915cd3bd0Vendor (CNA)
debian:linux6.1.20-1 · 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).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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✗ → ✓

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References

Show all references (3 more)

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

All records