Get a Demo

Let's Patch It!

Book a short call with one our specialists, we'll walk you through how Endor Patches work, and ask you a few questions about your environment (like your primary programming languages and repository management). We'll also send you an email right after you fill out the form, feel free to reply with any questions you have in advance!

CVE

CVE-2026-68123

openvswitch: fix GSO userspace truncation underflow
Back to all
CVE

CVE-2026-68123

openvswitch: fix GSO userspace truncation underflow

In the Linux kernel, the following vulnerability has been resolved:

openvswitch: fix GSO userspace truncation underflow

OVSACTIONATTR_TRUNC currently stores a delta from the original skb

length in OVS_CB(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 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.

Package Versions Affected

Package Version
patch Availability
No items found.

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
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://git.kernel.org/stable/c/100a23b1613e9218e0af654ef102352c713f0263, https://git.kernel.org/stable/c/2623c48cc3a8da9a1886fd8f65c0e348f4406fd6, https://git.kernel.org/stable/c/4032f8ed10fcb84d41c508dfb04be96589f78dfe, https://git.kernel.org/stable/c/50a6a85f3d6b1d22d8436848606cdef5d2c490b4, https://git.kernel.org/stable/c/a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855, https://git.kernel.org/stable/c/e211b081901ffca76674082c73eeaed53524c369, https://git.kernel.org/stable/c/ea85dbcbe8d4056ecb54352f97743d138ea4c407, https://git.kernel.org/stable/c/fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68123.json, https://nvd.nist.gov/vuln/detail/CVE-2026-68123, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00559%
EPSS Percentile
0.44115%
Introduced Version
f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1,4.8.0,5.11.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
4032f8ed10fcb84d41c508dfb04be96589f78dfe,5.10.265,5.15.216,6.1.183,6.6.148,6.12.101,6.18.42,7.1.6,6.12.101-1~deb12u1,6.12.101-1

Fix Critical Vulnerabilities Instantly

Secure your app without upgrading.
Fix Without Upgrading