CVE-2026-68123
mediumpriority · track · 0EPSS 0.006 · 46 %ileDEEUFRRUEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 5.7–9.8
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (39)
Products and version ranges known to be affected.
advisories (4)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-2730Linux Kernel: Mehrere SchwachstellenDeutsch2026-08-10csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen, darunter möglicherweise die Ausführung von beliebigem Code, die Ausweitung von Berechtigungen, die Offenlegung von Informationen, die Manipulation von Daten oder Denial-of-Service-Zustände.
- CERTFR-2026-AVI-1333Multiples vulnérabilités dans le noyau Linux d'UbuntuFrançais2026-10-16vendor · certfrFR
- CERTFR-2026-AVI-1334Multiples vulnérabilités dans le noyau Linux de Red HatFrançais2026-10-16vendor · certfrFR
- CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (19)
External citations — patches, advisories, analysis.
- https://git.kernel.org/stable/c/100a23b1613e9218e0af654ef102352c713f0263cnnvd
- https://git.kernel.org/stable/c/4032f8ed10fcb84d41c508dfb04be96589f78dfecnnvd
- https://git.kernel.org/stable/c/a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855cnnvd
- https://git.kernel.org/stable/c/ea85dbcbe8d4056ecb54352f97743d138ea4c407cnnvd
- https://git.kernel.org/stable/c/fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dccnnvd
- https://www.kernel.org/Patchcnnvd
- https://git.kernel.org/stable/c/100a23b1613e9218e0af654ef102352c713f0263enisa_euvd
- https://git.kernel.org/stable/c/4032f8ed10fcb84d41c508dfb04be96589f78dfeenisa_euvd
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