NULL pointer dereference in Linux kernel - CVE-2026-64048

Vulnerability identifier: #VU138585

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64048

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to a null pointer dereference in smc_v2_determine_accepted_chid and smc_conn_create when processing a crafted SMC-Dv2 accept reply with CHID 0. A remote attacker can send a specially crafted reply to trigger a kernel fault and cause a denial of service.

Exploitation requires a malicious peer to reply to an SMC-Dv2-only proposal.

Linux kernel
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Anolis OS
Ubuntu
kernel-rt (Red Hat package)
kernel-debug-core
kernel-doc
kernel-abi-stablelists
python3-perf
perf
kernel-tools-libs-devel
kernel-tools-libs
kernel-tools
kernel-modules-extra
kernel-modules
kernel-headers
kernel-devel
kernel-debug-modules-extra
kernel-debug-modules
kernel-debug-devel
kernel-debug
kernel-cross-headers
kernel-core
kernel
bpftool
linux-ibm (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-rt (Red Hat package) - update to 4.18.0-553.157.1.rt7.498.el8_10
kernel-debug-core - update to 4.18.0-553.157.1.0.1
kernel-doc - update to 4.18.0-553.157.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.157.1.0.1
python3-perf - update to 4.18.0-553.157.1.0.1
perf - update to 4.18.0-553.157.1.0.1
kernel-tools-libs-devel - update to 4.18.0-553.157.1.0.1
kernel-tools-libs - update to 4.18.0-553.157.1.0.1
kernel-tools - update to 4.18.0-553.157.1.0.1
kernel-modules-extra - update to 4.18.0-553.157.1.0.1
kernel-modules - update to 4.18.0-553.157.1.0.1
kernel-headers - update to 4.18.0-553.157.1.0.1
kernel-devel - update to 4.18.0-553.157.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.157.1.0.1
kernel-debug-modules - update to 4.18.0-553.157.1.0.1
kernel-debug-devel - update to 4.18.0-553.157.1.0.1
kernel-debug - update to 4.18.0-553.157.1.0.1
kernel-cross-headers - update to 4.18.0-553.157.1.0.1
kernel-core - update to 4.18.0-553.157.1.0.1
kernel - update to 4.18.0-553.157.1.0.1
bpftool - update to 4.18.0-553.157.1.0.1
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
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

• https://git.kernel.org/stable/c/277740023def559a4a2ddc3e8e784ee37a0f16a9
• https://git.kernel.org/stable/c/53eb7bd09aace72fa17510d80e0caf5ca058c231
• https://git.kernel.org/stable/c/65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e
• https://git.kernel.org/stable/c/6927cacf2b10d4fa80c1a2d407512ef9397c59c6
• https://git.kernel.org/stable/c/afa9036b8c9963947b487c36e332df6a42c96fcb
• https://git.kernel.org/stable/c/d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0

• NULL pointer dereference in Linux kernel smc
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Red Hat Enterprise Linux 8 update for kernel-rt
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia
• Anolis OS update for kernel:4.18