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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98582: nfc: st21nfca: validate received frame size

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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 57919d0662d8856211b794140172e51ca389f23d, 7b996cc06dda54c02a5aa607bda01109f0ac51e6, 8934d2889ae16a7c77520e002398d0689c1ecea5; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 57919d0662d8856211b794140172e51ca389f23d, 7b996cc06dda54c02a5aa607bda01109f0ac51e6, 8934d2889ae16a7c77520e002398d0689c1ecea5; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1 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: st21nfca: validate received frame size st21nfca_hci_i2c_repack() trims a received frame at its EOF marker before removing byte stuffing. It then assumes the truncated frame contains the LLC header and two CRC bytes, and it unconditionally reads the byte after an escape marker. A malformed frame can place EOF immediately after the start marker or can end its data portion with an escape marker. The former leaves too few bytes for check_crc(), while the latter makes the unstuffing loop read past the current skb length. Require the minimum framing bytes both before and after unstuffing. Use separate input and output cursors while removing byte stuffing, and reject an escape marker without its encoded byte. This keeps malformed frames within the received frame boundary before CRC processing.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th 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%

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

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  • 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.

—

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

    • 3.16affected
    • 3096e25a3e40b73afd59e46f3bf8d84f919992a1 and later · before 8934d2889ae16a7c77520e002398d0689c1ecea5affected · git
    • 3096e25a3e40b73afd59e46f3bf8d84f919992a1 and later · before d0596ee6c4b928a5c288790522a7495ee867da72affected · git
    • 3096e25a3e40b73afd59e46f3bf8d84f919992a1 and later · before f526c218a149a30f110ce434ff17e033042404b8affected · git
    • 3096e25a3e40b73afd59e46f3bf8d84f919992a1 and later · before d4008c3499dba7829bfe002edd99a8bff8ae3a7caffected · git
    • 3096e25a3e40b73afd59e46f3bf8d84f919992a1 and later · before 91be5161f37b0a2795ad6806d69be5fa74522e5caffected · git
    • 3096e25a3e40b73afd59e46f3bf8d84f919992a1 and later · before 57919d0662d8856211b794140172e51ca389f23daffected · git
    • 3096e25a3e40b73afd59e46f3bf8d84f919992a1 and later · before 7b996cc06dda54c02a5aa607bda01109f0ac51e6affected · git
    • 3096e25a3e40b73afd59e46f3bf8d84f919992a1 and later · before a653c01ce447f10c36b901646888c0330363af4faffected · git
    • before 3.16not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.9-17.2.9-1

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-2026-98580Oct 18, 2026 · nfc: llcp: Fix race condition in accept_queue lifecycle
    0Monitor
  • ← EarlierCVE-2026-98581Oct 18, 2026 · nfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm()
    0Monitor
  • Later →CVE-2026-98583Oct 18, 2026 · nfc: nfcmrvl: validate helper command length before pull
    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 Linux57919d0662d8856211b794140172e51ca389f23dVendor (CNA)
Linux Linux7b996cc06dda54c02a5aa607bda01109f0ac51e6Vendor (CNA)
Linux Linux8934d2889ae16a7c77520e002398d0689c1ecea5Vendor (CNA)
Linux Linux91be5161f37b0a2795ad6806d69be5fa74522e5cVendor (CNA)
Linux Linuxa653c01ce447f10c36b901646888c0330363af4fVendor (CNA)
Linux Linuxd0596ee6c4b928a5c288790522a7495ee867da72Vendor (CNA)
Linux Linuxd4008c3499dba7829bfe002edd99a8bff8ae3a7cVendor (CNA)
Linux Linuxf526c218a149a30f110ce434ff17e033042404b8Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · 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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 10, 2026+23 d
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).

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

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. Exploit maturity— → 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