CVE-2026-68123

Critical

Description

In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix GSO userspace truncation underflow OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb length in OVS_CB(skb)->cutlen. When a later userspace action segments a GSO skb, queue_gso_packets() reuses that delta for each smaller segment. A segment can then reach queue_userspace_packet() with cutlen greater than skb->len, underflowing the length passed to skb_zerocopy(). Store the maximum preserved length instead and bound each consumer against the current skb length. Use U32_MAX as the no-truncation sentinel so the value remains valid if skb geometry changes before a consumer handles it.

SeverityCritical

CVSS9.8

Exploit probability—

Product

Linux

PublishedAug 10, 2026

First seenAug 10, 2026

Weakness typeCWE-191CWE-191

How to fix

Update

Linux Linux50a6a85f3d6b1d22d8436848606cdef5d2c490b4, 2623c48cc3a8da9a1886fd8f65c0e348f4406fd6, e211b081901ffca76674082c73eeaed53524c369, a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855, fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc, 100a23b1613e9218e0af654ef102352c713f0263, ea85dbcbe8d4056ecb54352f97743d138ea4c407, 4032f8ed10fcb84d41c508dfb04be96589f78dfe or later

Affected products

Product	Affected versions	Fixed in
Linux Linux	f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 ≤ v < 50a6a85f3d6b1d22d8436848606cdef5d2c490b4, f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 ≤ v < 2623c48cc3a8da9a1886fd8f65c0e348f4406fd6, f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 ≤ v < e211b081901ffca76674082c73eeaed53524c369, f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 ≤ v < a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855, f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 ≤ v < fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc, f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 ≤ v < 100a23b1613e9218e0af654ef102352c713f0263, f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 ≤ v < ea85dbcbe8d4056ecb54352f97743d138ea4c407, f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 ≤ v < 4032f8ed10fcb84d41c508dfb04be96589f78dfe, 4.8	50a6a85f3d6b1d22d8436848606cdef5d2c490b4, 2623c48cc3a8da9a1886fd8f65c0e348f4406fd6, e211b081901ffca76674082c73eeaed53524c369, a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855, fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc, 100a23b1613e9218e0af654ef102352c713f0263, ea85dbcbe8d4056ecb54352f97743d138ea4c407, 4032f8ed10fcb84d41c508dfb04be96589f78dfe

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