Heap-based buffer overflow in Linux kernel - CVE-2026-89530
Published: September 12, 2026
Vulnerability identifier: #VU149281
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89530
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to corrupt adjacent slab memory.
The vulnerability exists due to a heap-based buffer overflow in svc_rdma_xb_linearize() when processing oversized inline RPC-over-RDMA replies without a Write list or Reply chunk. A remote attacker can request an oversized inline reply without providing a Write list or Reply chunk to corrupt adjacent slab memory.
The posted scatter/gather entry length can cause the device to read beyond the mapped region.
Affected software
Linux kernel
How to mitigate CVE-2026-89530
Install security update from vendor's repository.