CVE-2026-31683 Linux — Exploit & Vulnerability Details HIGH

Parameter	Value
CVSS	7.8 (HIGH)
Affected Versions	2.6.38 — 7.0
Fixed In	5.10.253
Vendor	Linux
Public PoC	No

In the Linux kernel, the following vulnerability has been resolved: batman-adv: avoid OGM aggregation when skb tailroom is insufficient When OGM aggregation state is toggled at runtime, an existing forwarded packet may have been allocated with only packet_len bytes, while a later packet can still be selected for aggregation. Appending in this case can hit skb_put overflow conditions. Reject aggregation when the target skb tailroom cannot accommodate the new packet.

The caller then falls back to creating a new forward packet instead of appending.

Attack Parameters

Attack Vector

Local

Requires local access

Attack Complexity

Low

Easy to exploit

Privileges Required

Low

Basic 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 12

Configuration	From (including)	Up to (excluding)
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`2.6.38`	`5.10.253`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`2.6.38`	`5.15.203`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`2.6.38`	`6.1.167`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`2.6.38`	`6.6.130`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`2.6.38`	`6.12.78`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`2.6.38`	`6.18.20`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`2.6.38`	`6.19.10`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel::::::::	`2.6.38`	`7.0`
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel:7.0:rc1::::::	—	—
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel:7.0:rc2::::::	—	—
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel:7.0:rc3::::::	—	—
Linux Linux_Kernel cpe:2.3:o:linux:linux_kernel:7.0:rc4::::::	—	—