NULL pointer dereference in Linux kernel - CVE-2026-64048
Published: July 20, 2026
Vulnerability identifier: #VU138585
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-64048
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-64048
Install security update from vendor's repository.
Sources
- 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