CVE-2026-80796: Linux kernel · nfc: nci: add data_len bound checks to activation parameter extractors
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 9% 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 for this vulnerability has been implemented in the Linux kernel by adding proper bounds checks to the affected NFC activation parameter extractor functions. Users should apply the official kernel updates that include these changes. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor or Linux kernel advisory for the current remediation guidance.
Description
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: add data_len bound checks to activation parameter extractors nci_extract_activation_params_iso_dep() and nci_extract_activation_params_nfc_dep() read an inner length byte from the NCI RF_INTF_ACTIVATED_NTF payload and use it to memcpy() into fixed kernel buffers, but neither function receives the caller-validated activation_params_len. A crafted NCI notification with activation_params_len=1 and an inner length byte of up to 20 (NFC-A) or 50 (NFC-B) causes memcpy() to read that many bytes past the one valid byte in the activation params region -- a slab out-of-bounds read of kernel memory adjacent to the NCI skb. The sibling nci_extract_rf_params_*() family was given equivalent protection by commit 571dcbeb8e63 ("net: nfc: nci: Fix parameter validation for packet data"), but the two activation parameter extractors were not updated at that time. Add a data_len parameter to both functions, guard against an empty region before consuming the inner length byte, decrement the remaining count after consuming it, and clamp the copy length to what is actually available. Update both call sites to pass ntf.activation_params_len, which is already validated against the skb at ntf.c:801.
References
- nvd.nist.gov/vuln/detail/CVE-2026-80796 (opens in a new tab)
- git.kernel.org/stable/c/0428fa2c22e2ba0cff766d3b80d461e149102045 (opens in a new tab)
- git.kernel.org/stable/c/04e51353cb9fa321caaeeed8331d4cd041fbaca7 (opens in a new tab)
- git.kernel.org/stable/c/1168484fe2b3828bf24a46f3c42a8719fade679b (opens in a new tab)
- git.kernel.org/stable/c/9620a91f8d643b680f417a435db399a04d1e06d8 (opens in a new tab)
- git.kernel.org/stable/c/9b01f5af0dc59263b59391b148bc78d83c0354a9 (opens in a new tab)
- git.kernel.org/stable/c/be311c0cfeadfbe815ea22d2914a98d06e3fab0e (opens in a new tab)
- git.kernel.org/stable/c/cf9d44be50b9074a5abdc301b4a3ba3e283591df (opens in a new tab)
- git.kernel.org/stable/c/e25b44bd8b8cc666b49a3fe0ef547e64d5b1e300 (opens in a new tab)
- git.kernel.org/stable/c/f5c534b53f8c424a8e7633c9b585475c4bf4ee18 (opens in a new tab)
- ubuntu.com/security/CVE-2026-80796 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80796 (opens in a new tab)
- git.kernel.org/linus/0428fa2c22e2ba0cff766d3b80d461e149102045 (opens in a new tab)