CVE-2026-98577: Linux kernel · nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc : update Linux kernel when convenient.
Data as of 26 Oct 2026, 17:16 UTC
Rated Medium by Threat Radar's AI analysis · 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.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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AI-suggested
A fix is available and has been applied in multiple Linux kernel commits. Users should update to a Linux kernel version that includes these fixes. No additional mitigation steps are indicated by the vendor.
Description
A vulnerability in the Linux kernel NFC subsystem's llcp component allows WKS SAP hijacking due to improper prefix matching in the nfc_llcp_wks_sap() function. The function compares only the length of the service name, causing short names to incorrectly match longer WKS strings. This was fixed by requiring an exact length match before string comparison.
References
- git.kernel.org/stable/c/0c83a8a45fed256ccc5fe7160b436b671fc79fb8 (opens in a new tab)
- git.kernel.org/stable/c/aa555ed5ed0d15efbaf27e0e9f152a6df715278a (opens in a new tab)
- git.kernel.org/stable/c/32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8 (opens in a new tab)
- git.kernel.org/stable/c/6fad2c34d451d11a9f3f946cae1105fee91d96b8 (opens in a new tab)
- git.kernel.org/stable/c/bf41af8f910cbb5d776a1dfa0671d31a7e262e28 (opens in a new tab)
- git.kernel.org/stable/c/f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc (opens in a new tab)
- git.kernel.org/stable/c/0a0412745c86acd089c6460da715ab966b1615e7 (opens in a new tab)
- git.kernel.org/stable/c/408cff6bd60636df201274d320edfdfde9ed41db (opens in a new tab)