CVE-2026-98323 Linux — Exploit & Vulnerability Details CRITICAL

Parameter	Value
CVSS	9.8 (CRITICAL)
Affected Versions	5.10.150 — 7.3-rc4
Fixed In	5.10.271
Vendor	Linux
Public PoC	No

In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Bound fragmented header copies by the remaining length siw_get_hdr() can receive an extended DDP/RDMAP header across more than one TCP callback. The first callback may receive most of the header, while the next one still limits the copy to hdrlen - MIN_DDP_HDR instead of the number of missing bytes. This makes the destination move past the end of the header and overwrite the receive state, including fpdu_part_rcvd.

A later callback can then use a negative fpdu_part_rcvd value as a copy offset, which creates an OOB write. Use the number of header bytes already received when calculating the next copy length.

Attack Parameters

Attack Vector

Network

Can be exploited remotely

Attack Complexity

Low

Easy to exploit

Privileges Required

None

No privileges needed

User Interaction

None

No user interaction needed

Impact Assessment

Confidentiality

High

Complete data leak

Integrity

High

Complete data modification

Availability

High

Complete denial of service

CVSS Vector v3.1

Vulnerable Products 11

Configuration	From (including)	Up to (excluding)
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`5.10.150`	`5.10.271`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`5.15.75`	`5.15.222`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`6.1`	`6.1.189`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`6.1`	`6.6.158`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`6.1`	`6.12.112`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`6.1`	`6.18.54`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`6.1`	`7.2.8`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`6.1`	`7.3-rc4`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`5.4.220`	—
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`5.19.17`	—
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`6.0.3`	—