CVE-2026-68123

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Source
https://cve.org/CVERecord?id=CVE-2026-68123
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68123.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-68123
Downstream
Published
2026-08-10T11:58:43Z
Modified
2026-08-21T03:30:39Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
openvswitch: fix GSO userspace truncation underflow
Details

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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68123.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1
Fixed
50a6a85f3d6b1d22d8436848606cdef5d2c490b4
Fixed
2623c48cc3a8da9a1886fd8f65c0e348f4406fd6
Fixed
e211b081901ffca76674082c73eeaed53524c369
Fixed
a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855
Fixed
fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc
Fixed
100a23b1613e9218e0af654ef102352c713f0263
Fixed
ea85dbcbe8d4056ecb54352f97743d138ea4c407
Fixed
4032f8ed10fcb84d41c508dfb04be96589f78dfe

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68123.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.8.0
Fixed
5.10.265
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.216
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.183
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.148
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.101
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.42
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.1.6

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68123.json"