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NVD / CVE Program· CNA Linux

CVE-2026-43032: NFC: pn533: bound the UART receive buffer

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 23e925183db26cd322597679669ad29d70ed2ada, 2c1fadd221b21d8038acfe6a0f56291881d5ff76, 30fe3f5f6494f827d812ff179f295a8e532709d6.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 23e925183db26cd322597679669ad29d70ed2ada, 2c1fadd221b21d8038acfe6a0f56291881d5ff76, 30fe3f5f6494f827d812ff179f295a8e532709d6 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: NFC: pn533: bound the UART receive buffer pn532_receive_buf() appends every incoming byte to dev->recv_skb and only resets the buffer after pn532_uart_rx_is_frame() recognizes a complete frame. A continuous stream of bytes without a valid PN532 frame header therefore keeps growing the skb until skb_put_u8() hits the tail limit. Drop the accumulated partial frame once the fixed receive buffer is full so malformed UART traffic cannot grow the skb past PN532_UART_SKB_BUFF_LEN.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 2th 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.

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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.

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 kernel5.5 and later · before 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.168
  • linux linux kernel6.2 and later · before 6.6.134
  • linux linux kernel6.7 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • 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

    • 5.5affected
    • c656aa4c27b17a8c70da223ed5ab42145800d6b5 and later · before 8bedf1dd5640ac8997bff00bbefe241b438df397affected · git
    • c656aa4c27b17a8c70da223ed5ab42145800d6b5 and later · before 23e925183db26cd322597679669ad29d70ed2adaaffected · git
    • c656aa4c27b17a8c70da223ed5ab42145800d6b5 and later · before 3adca9be14bf36b927193f05f5aea35a1a90e913affected · git
    • c656aa4c27b17a8c70da223ed5ab42145800d6b5 and later · before 2c1fadd221b21d8038acfe6a0f56291881d5ff76affected · git
    • c656aa4c27b17a8c70da223ed5ab42145800d6b5 and later · before f48ab6ee654ecc350434e4566bc785773f412b7eaffected · git
    • c656aa4c27b17a8c70da223ed5ab42145800d6b5 and later · before ad2f60de5045bfb5d20ea468a97c8760c6a3a4f8affected · git
    • c656aa4c27b17a8c70da223ed5ab42145800d6b5 and later · before cf2ff10183204349edfd6b972e189375fc5f1fb0affected · git
    • c656aa4c27b17a8c70da223ed5ab42145800d6b5 and later · before 30fe3f5f6494f827d812ff179f295a8e532709d6affected · git
    • before 5.5not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.12-16.19.12-1

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-2026-43029May 1, 2026 · mptcp: fix soft lockup in mptcp_recvmsg()
    30Monitor
  • ← EarlierCVE-2026-43031May 1, 2026 · net: xilinx: axienet: Fix BQL accounting for multi-BD TX packets
    30Monitor
  • Later →CVE-2026-43039May 1, 2026 · net: ti: icssg-prueth: fix missing data copy and wrong recycle in ZC RX dispatch
    39Monitor

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 Linux23e925183db26cd322597679669ad29d70ed2adaVendor (CNA)
Linux Linux2c1fadd221b21d8038acfe6a0f56291881d5ff76Vendor (CNA)
Linux Linux30fe3f5f6494f827d812ff179f295a8e532709d6Vendor (CNA)
Linux Linux3adca9be14bf36b927193f05f5aea35a1a90e913Vendor (CNA)
Linux Linux8bedf1dd5640ac8997bff00bbefe241b438df397Vendor (CNA)
Linux Linuxad2f60de5045bfb5d20ea468a97c8760c6a3a4f8Vendor (CNA)
Linux Linuxcf2ff10183204349edfd6b972e189375fc5f1fb0Vendor (CNA)
Linux Linuxf48ab6ee654ecc350434e4566bc785773f412b7eVendor (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)

—

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. 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