VulnerabilityPublished 18 Oct 2026

CVE-2026-98577: Linux kernel · nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()

Source GCVE Database

Authoritative record:CVE-2026-98577· Medium

Not known to be exploited · fixed in f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc : 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 f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc, bf41af8f910cbb5d776a1dfa0671d31a7e262e28, aa555ed5ed0d15efbaf27e0e9f152a6df715278a +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-5pvx-6xr7-wr9x

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc	Fixed in f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc
LinuxLinux	Affected ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < bf41af8f910cbb5d776a1dfa0671d31a7e262e28	Fixed in bf41af8f910cbb5d776a1dfa0671d31a7e262e28
LinuxLinux	Affected ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < aa555ed5ed0d15efbaf27e0e9f152a6df715278a	Fixed in aa555ed5ed0d15efbaf27e0e9f152a6df715278a
LinuxLinux	Affected ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < 408cff6bd60636df201274d320edfdfde9ed41db	Fixed in 408cff6bd60636df201274d320edfdfde9ed41db
LinuxLinux	Affected ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < 32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8	Fixed in 32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8
LinuxLinux	Affected ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < 6fad2c34d451d11a9f3f946cae1105fee91d96b8	Fixed in 6fad2c34d451d11a9f3f946cae1105fee91d96b8

AI-suggested

A fix has been implemented in the Linux kernel to require exact length matching before string comparison in the nfc_llcp_wks_sap() function. Users should apply the official Linux kernel updates that include this fix. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's NFC LLCP implementation allowed a WKS SAP hijacking due to improper prefix matching in the nfc_llcp_wks_sap() function. The function compared only the length of the service name prefix, enabling shorter service names to match longer WKS strings incorrectly. This issue has been fixed by enforcing an exact length match before performing the string comparison.

References

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