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NVD / CVE Program· CNA Linux

CVE-2026-90063: virtio-net: Ensure that TCP packets don't overflow gso_segs

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 0e5ed3b98d1d8d251acfdccfeaa607453ad12954, 29bd12c7c5f9d6cf855b87bace18f71e9607f9e8, 339f47ae04dcc6b5a730dd6bc70dddc8937c3260.

Low priority for now. Upgrade to Linux Linux 0e5ed3b98d1d8d251acfdccfeaa607453ad12954, 29bd12c7c5f9d6cf855b87bace18f71e9607f9e8, 339f47ae04dcc6b5a730dd6bc70dddc8937c3260 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: virtio-net: Ensure that TCP packets don't overflow gso_segs The user can specify any gso_size in a packet crafted with an AF_PACKET PACKET_VNET_HDR socket, even smaller than TCP_MIN_GSO_SIZE = 8. At the same time, GSO_MAX_SIZE = 8 * GSO_MAX_SEGS = 8 * 65535. When the user crafts a packet with gso_size < 8, there is a risk for partial GSO to overflow the 16-bit gso_segs field when dividing the SKB length by gso_size. Adjust gso_size of TCP packets to be at least TCP_MIN_GSO_SIZE = 8. Keep gso_size of UDP GSO packets, as gso_size=1 is valid and explicitly tested at tools/testing/selftests/net/tun.c:649.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • bfbaf151efe491e30697e21c8b7ae1b615480873, 6c83456601e65a6dd371ddf595510183d198e9b1, b3ebd9830c6026c98f03f7047c9d608573773f13, b96fb681ca789629b8ba3da99ca3b2e6fa807f0a, 5.7affected
    • 7c6d2ecbda83150b2036a2b36b21381ad4667762 and later · before d3d111fe809773edbb4ae121e36253b7d683509aaffected · git
    • 7c6d2ecbda83150b2036a2b36b21381ad4667762 and later · before 8f6667a081887c2b59c6f3dd86c1789ada563762affected · git
    • 7c6d2ecbda83150b2036a2b36b21381ad4667762 and later · before 339f47ae04dcc6b5a730dd6bc70dddc8937c3260affected · git
    • 7c6d2ecbda83150b2036a2b36b21381ad4667762 and later · before 29bd12c7c5f9d6cf855b87bace18f71e9607f9e8affected · git
    • 7c6d2ecbda83150b2036a2b36b21381ad4667762 and later · before 0e5ed3b98d1d8d251acfdccfeaa607453ad12954affected · git
    • 7c6d2ecbda83150b2036a2b36b21381ad4667762 and later · before 75c271c48f483af678e514734e10b2452410e08caffected · git
    • 7c6d2ecbda83150b2036a2b36b21381ad4667762 and later · before c27c449d455aafd9018a3cbab150f1c42c87923faffected · git
    • 4.14.187 and later · before 4.15affected · semver
    • 4.19.131 and later · before 4.20affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90061Sep 17, 2026 · netfilter: nf_tables: skip double clone set expressions on element insert
    0Monitor
  • ← EarlierCVE-2026-90062Sep 17, 2026 · netfilter: nf_tables: move hardware offload step after building the chain blob
    28Monitor
  • Later →CVE-2026-90064Sep 17, 2026 · drm/xe: Reject page faults from non-fault-mode scratch VMs
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0e5ed3b98d1d8d251acfdccfeaa607453ad12954Vendor (CNA)
Linux Linux29bd12c7c5f9d6cf855b87bace18f71e9607f9e8Vendor (CNA)
Linux Linux339f47ae04dcc6b5a730dd6bc70dddc8937c3260Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5.7Vendor (CNA)
Linux Linux75c271c48f483af678e514734e10b2452410e08cVendor (CNA)
Linux Linux8f6667a081887c2b59c6f3dd86c1789ada563762Vendor (CNA)
Linux Linuxc27c449d455aafd9018a3cbab150f1c42c87923fVendor (CNA)
Linux Linuxd3d111fe809773edbb4ae121e36253b7d683509aVendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records