CVE-2026-80794: Linux kernel · nfc: nci: fix uninit-value in the RF discover/activated NTF handlers
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 15% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 4 Sep 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
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
This vulnerability has been resolved in the Linux kernel by zero-initializing the affected notification structures. Users should update to the fixed kernel version containing this patch. Since this is a kernel-level fix, applying the official kernel update from the vendor or distribution is the recommended remediation. Patch status is not explicitly confirmed in the provided data; users should consult their Linux distribution's security advisories for the exact fixed versions.
Description
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: fix uninit-value in the RF discover/activated NTF handlers nci_rf_discover_ntf_packet() and nci_rf_intf_activated_ntf_packet() each parse a notification into an on-stack struct (nci_rf_discover_ntf / nci_rf_intf_activated_ntf) that is not initialised. The RF technology-specific parameters are only extracted when rf_tech_specific_params_len is non-zero, so a notification that reports a zero length leaves the rf_tech_specific_params union uninitialised - and both handlers then pass it to nci_add_new_protocol(), which reads it: - discover: nci_add_new_target() -> nci_add_new_protocol(); - activated: nci_target_auto_activated() -> nci_add_new_protocol(). nci_add_new_protocol() uses nfca_poll->nfcid1_len as both a branch condition and a memcpy() length and copies nfcid1/sens_res/sel_res into ndev->targets, which is later exposed to user space via NFC_CMD_GET_TARGET. BUG: KMSAN: uninit-value in nci_add_new_protocol+0x624/0x6c0 nci_add_new_protocol+0x624/0x6c0 nci_ntf_packet+0x25b2/0x3c30 nci_rx_work+0x318/0x5d0 process_scheduled_works+0x84b/0x17a0 worker_thread+0xc10/0x11b0 kthread+0x376/0x500 Local variable ntf.i created at: nci_ntf_packet+0xbc2/0x3c30 Zero-initialise both on-stack notifications so the union reads back as zero when no technology-specific parameters are present.
References
- nvd.nist.gov/vuln/detail/CVE-2026-80794 (opens in a new tab)
- git.kernel.org/stable/c/0d4b5cfab6891a5ca0f6aef209beebba4bd7c095 (opens in a new tab)
- git.kernel.org/stable/c/1007a6b429d756513abd25bd00290908f2e89a4a (opens in a new tab)
- git.kernel.org/stable/c/4bda9ef8392710f21e99027467f3f4afdfb5c99a (opens in a new tab)
- git.kernel.org/stable/c/5bd00c0e1470d90d77a7c60242854257ddf14e00 (opens in a new tab)
- git.kernel.org/stable/c/7086dab72b3ed95df96842801e10e935cfeb27a3 (opens in a new tab)
- git.kernel.org/stable/c/7489f59d1ea2d3298aa41de7baf193e5e6e132f6 (opens in a new tab)
- git.kernel.org/stable/c/8cbe06c1e699c0a165dae5093a2550e65f914818 (opens in a new tab)
- git.kernel.org/stable/c/d6f743d3d388913135681cde051c08823730194f (opens in a new tab)
- git.kernel.org/stable/c/fe69fed3495f676578d49414a069ad7d8468e2ce (opens in a new tab)
- ubuntu.com/security/CVE-2026-80794 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80794 (opens in a new tab)
- git.kernel.org/linus/8cbe06c1e699c0a165dae5093a2550e65f914818 (opens in a new tab)