CVE
DEBIAN-CVE-2026-68123
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...
In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix GSO userspace truncation underflow OVSACTIONATTRTRUNC currently stores a delta from the original skb length in OVSCB(skb)->cutlen. When a later userspace action segments a GSO skb, queuegsopackets() reuses that delta for each smaller segment. A segment can then reach queueuserspacepacket() with cutlen greater than skb->len, underflowing the length passed to skbzerocopy(). Store the maximum preserved length instead and bound each consumer against the current skb length. Use U32MAX as the no-truncation sentinel so the value remains valid if skb geometry changes before a consumer handles it.
Package Versions Affected
Package Version
patch Availability
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CVSS Version
Severity
Base Score
CVSS Version
Score Vector
C
H
U
-
C
H
U
0
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3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-
Related Resources
No items found.
References
https://security-tracker.debian.org/tracker/CVE-2026-68123