CVE-2026-80795: Linux kernel · nfc: nci: fix out-of-bounds write in nci_target_auto_activated()
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
A fix has been implemented in the Linux kernel to add proper boundary checks in nci_target_auto_activated(). Users and administrators should apply the official Linux kernel updates that include this patch. Since this is not a cloud service, remediation depends on updating the affected Linux kernel versions once the patch is released.
Description
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: fix out-of-bounds write in nci_target_auto_activated() nci_target_auto_activated() appends a target to the fixed-size array ndev->targets[NCI_MAX_DISCOVERED_TARGETS] and increments ndev->n_targets without first checking the array is full; unlike its sibling nci_add_new_target(), which bails out when n_targets already equals NCI_MAX_DISCOVERED_TARGETS. ndev->n_targets is only cleared by nci_clear_target_list(), so an NFCC that repeatedly re-runs discovery (RF_DISCOVER_RSP, which re-enters NCI_DISCOVERY without clearing the target list) and reports an auto-activated target (RF_INTF_ACTIVATED_NTF) drives n_targets past the limit. The append then writes a struct nfc_target past the end of the array (a slab out-of-bounds write), and nfc_targets_found() goes on to walk the array with the inflated count: BUG: KASAN: slab-out-of-bounds in nci_add_new_protocol+0x94/0x2ac [nci] Write of size 2 at addr ffff0000c7299a18 by task kworker/u8:0/12 Workqueue: nfc0_nci_rx_wq nci_rx_work [nci] Call trace: nci_add_new_protocol+0x94/0x2ac [nci] nci_ntf_packet+0xddc/0x11a0 [nci] nci_rx_work+0x15c/0x1e0 [nci] process_one_work+0x2dc/0x500 worker_thread+0x240/0x460 kthread+0x1c0/0x1d0 ret_from_fork+0x10/0x20 The buggy address belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1024 bytes to the right of allocated 1560-byte region [ffff0000c7299000, ffff0000c7299618) Guard nci_target_auto_activated() with the same check used by nci_add_new_target().
References
- nvd.nist.gov/vuln/detail/CVE-2026-80795 (opens in a new tab)
- git.kernel.org/stable/c/0dc59de0075f88404a0f4a2b5233104ef459fbb2 (opens in a new tab)
- git.kernel.org/stable/c/129032c0616d83a5e3e304f6ebf88f14ba01e5f7 (opens in a new tab)
- git.kernel.org/stable/c/24761d3a5f692df5f7d848caeabcb2afd10917aa (opens in a new tab)
- git.kernel.org/stable/c/2f08dbce3b37624ec6b424d759336a99586170ec (opens in a new tab)
- git.kernel.org/stable/c/50e87e1c0e18d791dcd7dccf30f9a2f3e2cf3951 (opens in a new tab)
- git.kernel.org/stable/c/94530ffabfca57e9bff1d207106010014cc84032 (opens in a new tab)
- git.kernel.org/stable/c/ac200079db50af81e6b04d058b33ec92901d8edd (opens in a new tab)
- git.kernel.org/stable/c/afd8605fb43becb892311102844955c3b127fc7e (opens in a new tab)
- git.kernel.org/stable/c/d7083f41c21b30582e91b2e6de4d54dce74f6f9c (opens in a new tab)
- ubuntu.com/security/CVE-2026-80795 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80795 (opens in a new tab)
- git.kernel.org/linus/ac200079db50af81e6b04d058b33ec92901d8edd (opens in a new tab)