NULL pointer dereference in Linux kernel - CVE-2019-12818

Vulnerability identifier: #VU19141

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2019-12818

CWE-ID: CWE-476

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

Vendor: Linux Foundation

Affected software:
Linux kernel

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dreference error in the Linux kernel before 4.20.15 when processing NFC data. The error is triggered by the  nfc_llcp_build_tlv function in net/nfc/llcp_commands.c that may return NULL. Such behavior can lead to a NULL pointer dereference in the nfc_llcp_build_gb() function in net/nfc/llcp_core.c. A remote attacker can perform a denial of service (DoS) attack.

Install update from vendor's website.

• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=58bdd544e2933a21a51eecf17c3f5f94038261b5
• https://github.com/torvalds/linux/commit/58bdd544e2933a21a51eecf17c3f5f94038261b5
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.15