Out-of-bounds read in Linux kernel - CVE-2026-63915

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Main Vulnerability Database Vulnerabilities #VU138735

Out-of-bounds read in Linux kernel - CVE-2026-63915

Published: July 20, 2026


Vulnerability identifier: #VU138735
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63915
CWE-ID: CWE-125
Exploitation vector: Adjecent network
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to out-of-bounds read in HCP header parsing in nfc_hci_recv_from_llc() and nci_hci_data_received_cb() when processing a 0-byte HCP frame from an NFC peer. A remote attacker can send a malformed HCP frame to cause a denial of service.

A non-final fragmented 0-byte frame can also underflow the reassembly length to UINT_MAX and trigger skb_over_panic() during reassembly.


Affected software

Linux kernel
Ubuntu
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

How to mitigate CVE-2026-63915

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

External References

Related Security Bulletins