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NVD / CVE Program· CNA Linux

CVE-2026-43291: net: nfc: nci: Fix parameter validation for packet data

Noroxi assessment

Priority: Monitor (action score 33/100)

  • 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: 0.26% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 3b91160e9a91b5a2662875417dc42dc5b0bf03ea, 498fc5d0d650c77e87fcc73808d4f43240c21805, 5.15.202.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3b91160e9a91b5a2662875417dc42dc5b0bf03ea, 498fc5d0d650c77e87fcc73808d4f43240c21805, 5.15.202 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: net: nfc: nci: Fix parameter validation for packet data Since commit 9c328f54741b ("net: nfc: nci: Add parameter validation for packet data") communication with nci nfc chips is not working any more. The mentioned commit tries to fix access of uninitialized data, but failed to understand that in some cases the data packet is of variable length and can therefore not be compared to the maximum packet length given by the sizeof(struct).

HighCVSS 8.3 · v3.1—No exploit Fix available
Published
May 8, 2026
Updated
Aug 5, 2026
EPSS
0.2% · 19th percentile

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
33 / 40 · 8.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CNA vs NVD score

NVD
—
CNA · Linux
8.3
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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-2026-43291

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 kernel5.15.195 and later · before 5.15.202
  • linux linux kernel6.1.156 and later · before 6.1.165
  • linux linux kernel6.6.112 and later · before 6.6.128
  • linux linux kernel6.12.53 and later · before 6.12.75
  • linux linux kernel6.17.3 and later · before 6.18
  • linux linux kernel6.18 and later · before 6.18.16
  • linux linux kernel6.19 and later · before 6.19.6

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

    • c395d1e548cc68e84584ffa2e3ca9796a78bf7b9, 6.18affected
    • 8fcc7315a10a84264e55bb65ede10f0af20a983f and later · before a24a8a582da4426b2042e510a1080df84083b51daffected · git
    • bfdda0123dde406dbff62e7e9136037e97998a15 and later · before f5218426f765eee22e178df9c126d974792fb6a5affected · git
    • 0ba68bea1e356f466ad29449938bea12f5f3711f and later · before ad058a4317db7fdb3f09caa6ed536d24a62ce6a0affected · git
    • 74837bca0748763a77f77db47a0bdbe63b347628 and later · before 3b91160e9a91b5a2662875417dc42dc5b0bf03eaaffected · git
    • 9c328f54741bd5465ca1dc717c84c04242fac2e1 and later · before c692db813a7e3b7c3c17d6e9a3ad2a018bf1142baffected · git
    • 9c328f54741bd5465ca1dc717c84c04242fac2e1 and later · before 498fc5d0d650c77e87fcc73808d4f43240c21805affected · git
    • 9c328f54741bd5465ca1dc717c84c04242fac2e1 and later · before 571dcbeb8e635182bb825ae758399831805693c2affected · git
    • 5.15.195 and later · before 5.15.202affected · semver
    • 6.1.156 and later · before 6.1.165affected · 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 6.19.6-16.19.6-1

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-2026-43286May 8, 2026 · mm/hugetlb: restore failed global reservations to subpool
    22Monitor
  • ← EarlierCVE-2026-43290May 8, 2026 · media: uvcvideo: Return queued buffers on start_streaming() failure
    31Monitor
  • Later →CVE-2026-43293May 8, 2026 · media: chips-media: wave5: Fix kthread worker destruction in polling mode
    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 Linux3b91160e9a91b5a2662875417dc42dc5b0bf03eaVendor (CNA)
Linux Linux498fc5d0d650c77e87fcc73808d4f43240c21805Vendor (CNA)
Linux Linux5.15.202Vendor (CNA)
Linux Linux571dcbeb8e635182bb825ae758399831805693c2Vendor (CNA)
Linux Linux6.1.165Vendor (CNA)
Linux Linux6.12.75Vendor (CNA)
Linux Linux6.18Vendor (CNA)
Linux Linux6.6.128Vendor (CNA)
Linux Linuxa24a8a582da4426b2042e510a1080df84083b51dVendor (CNA)
Linux Linuxad058a4317db7fdb3f09caa6ed536d24a62ce6a0Vendor (CNA)
Linux Linuxc692db813a7e3b7c3c17d6e9a3ad2a018bf1142bVendor (CNA)
Linux Linuxf5218426f765eee22e178df9c126d974792fb6a5Vendor (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.

  • CVE-2024-50302535 days apartHID: core: zero-initialize the report bufferKEV
    52Plan
  • CVE-2026-5298947 days apartnvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
    39Monitor
  • CVE-2026-5322548 days apartsctp: fix uninit-value in __sctp_rcv_asconf_lookup()
    36Monitor
  • CVE-2026-5317048 days apartaccel/ethosu: reject DMA commands with uninitialized length
    35Monitor
  • CVE-2026-431392 days apartxfrm6: fix uninitialized saddr in xfrm6_get_saddr()
    34Monitor
  • CVE-2026-434560 days apartbonding: fix type confusion in bond_setup_by_slave()
    31Monitor

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 on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
low · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
Low
Availability impact
High

Weakness class (CWE)

CWE-908 · Use of Uninitialized Resource

CVSS vector

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

nvd-secondary

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 (6 more)

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

All records