Out-of-bounds read in Linux kernel - CVE-2026-80986
Published: September 12, 2026
Vulnerability identifier: #VU149403
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-2026-80986
CWE-ID: CWE-125
Exploitation vector: Remote access
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 an out-of-bounds read in smc_llc_save_add_link_rkeys() when processing SMC-Rv2 link additions. A remote attacker can initiate an SMC-Rv2 link addition to cause a denial of service.
The issue occurs on links whose device has max_recv_sge set to 1, where no shared version 2 receive buffer is available.
Affected software
Linux kernel
How to mitigate CVE-2026-80986
Install security update from vendor's repository.