SB20260720177 - NULL pointer dereference in Linux kernel smc
Published: July 20, 2026
Security Bulletin ID
SB20260720177
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-64048)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.
References
- 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