VulnerabilityPublished 18 Oct 2026

CVE-2026-98578: Linux kernel · nfc: st21nfca: validate ISO15693 inventory length

Source GCVE Database

Authoritative record:CVE-2026-98578

Not known to be exploited · fixed in fdd95e819d828c975aaeb258a3fed5dd7fd136d0 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in fdd95e819d828c975aaeb258a3fed5dd7fd136d0, e47b2a350bb0ff123434ec5484c6dc3333b0727c, a86987d03a4d39acdbe4533d83db4d656ea36c59 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-mm2q-hf2x-48gq

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7974728094d35f38775417a26d8f30ea3602496a, < fdd95e819d828c975aaeb258a3fed5dd7fd136d0	Fixed in fdd95e819d828c975aaeb258a3fed5dd7fd136d0
LinuxLinux	Affected ≥ 7974728094d35f38775417a26d8f30ea3602496a, < e47b2a350bb0ff123434ec5484c6dc3333b0727c	Fixed in e47b2a350bb0ff123434ec5484c6dc3333b0727c
LinuxLinux	Affected ≥ 7974728094d35f38775417a26d8f30ea3602496a, < a86987d03a4d39acdbe4533d83db4d656ea36c59	Fixed in a86987d03a4d39acdbe4533d83db4d656ea36c59
LinuxLinux	Affected ≥ 7974728094d35f38775417a26d8f30ea3602496a, < 6353dae51bc9b3cad13c9d890b53311a46c96b4e	Fixed in 6353dae51bc9b3cad13c9d890b53311a46c96b4e
LinuxLinux	Affected ≥ 7974728094d35f38775417a26d8f30ea3602496a, < 57d183764f3002f9625ee4deeeb20716c519534e	Fixed in 57d183764f3002f9625ee4deeeb20716c519534e
LinuxLinux	Affected ≥ 7974728094d35f38775417a26d8f30ea3602496a, < 9fa21b0f78adb514e3bd96a505ddb752e9727ff3	Fixed in 9fa21b0f78adb514e3bd96a505ddb752e9727ff3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been applied in the Linux kernel to validate the ISO15693 inventory length properly. Users should update to the fixed kernel version once available. Since this is a kernel-level issue, applying the official kernel update from the vendor or distribution is the recommended remediation.

Description

A vulnerability in the Linux kernel's NFC subsystem (st21nfca driver) related to ISO15693 inventory length validation has been resolved. The issue involved the inventory helper removing a two-byte prefix without verifying its presence, then accepting a one-byte remainder before reading data as the DSFID. The fix requires the prefix and at least two remaining bytes before processing UID data and DSFID.

References

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