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CVE-2026-80906· NVD / CVE Program· CNA Linux

net: packet: fix wrong transport_header when sending VLAN-tagged frame

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: 0.16% (FIRST EPSS).
  • Fixed version: Linux Linux 01fdecc0480d916c799dbee584833a4a37e94d06, 5.10.266, 5.15.217; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 01fdecc0480d916c799dbee584833a4a37e94d06, 5.10.266, 5.15.217; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: net: packet: fix wrong transport_header when sending VLAN-tagged frame In packet_parse_headers(), when processing a VLAN-tagged frame, skb_set_network_header() is called to advance network_header past the VLAN tag to the inner protocol header. skb_probe_transport_header() is then called with skb->protocol still set to the outer VLAN EtherType (e.g. ETH_P_8021Q), while nhoff (derived from skb_network_offset()) already points past the VLAN tag to the inner protocol header. In __skb_flow_dissect(), proto is initialized to ETH_P_8021Q and nhoff points past the VLAN tag. When the dissector hits case ETH_P_8021Q, it reads a struct vlan_hdr at nhoff via __skb_header_pointer(), but that offset contains the inner protocol header (e.g. an IP header). The bytes are misinterpreted as a VLAN header, yielding a garbage encapsulated EtherType that matches no known protocol. The dissector returns false, so skb_probe_transport_header() never calls skb_set_transport_header(), leaving transport_header at its uninitialized sentinel value (~0U). Move skb_probe_transport_header() to before skb_set_network_header(). At the time skb_probe_transport_header() is called, network_header still points to the VLAN header, so nhoff correctly points to the VLAN header. The flow dissector can then parse the VLAN header, extract the inner EtherType, and advance nhoff to the inner protocol header, allowing transport_header to be set correctly.

—No exploit Fix available
Published
Sep 4, 2026
Updated
Sep 4, 2026
EPSS
0.1% · 5th 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 · 0.1%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • 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

    • ad3f90a9c4a2c74bb3711f2031bffda4ec44c849, 5.19affected
    • c2137d565ceb505de69593c181a0543bc4083838 and later · before a4b82de96d465ddb44bc931145c0fa80c4fe9c9caffected · git
    • 9ff46c36df2e0a1ac352f2f4038eaf3f0f7361b8 and later · before fa86bc52ea8ba981f74f851fd61e2a3d3bc0feacaffected · git
    • dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and later · before 5479eb9b355f44745d7ccfe112386bd4f96eceeaaffected · git
    • dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and later · before e451e20adb869a983a21dda158625f024142e61faffected · git
    • dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and later · before 6971cf319263d6a1b4096f9248aca9e57d77a1ebaffected · git
    • dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and later · before f9297abbcaba760b7a7b9d63b839f607f738013eaffected · git
    • dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and later · before 6386a6ffa2efba2965ed8e4fa303582c0b76a215affected · git
    • dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and later · before 01fdecc0480d916c799dbee584833a4a37e94d06affected · git
    • 5.10.163 and later · before 5.10.266affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.10-17.1.10-1

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-2026-80903Sep 4, 2026 · drm/xe/oa: Fix sync entry leak on OA config emit failure
    0Monitor
  • ← EarlierCVE-2026-80904Sep 4, 2026 · net/tls: Fail tls_sw_splice_read() after a failed async decrypt
    0Monitor
  • Later →CVE-2026-80907Sep 4, 2026 · drm/amdgpu: Fix UVD dpb min size calculation for H264
    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 Linux01fdecc0480d916c799dbee584833a4a37e94d06Vendor (CNA)
Linux Linux5.10.266Vendor (CNA)
Linux Linux5.15.217Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5479eb9b355f44745d7ccfe112386bd4f96eceeaVendor (CNA)
Linux Linux6386a6ffa2efba2965ed8e4fa303582c0b76a215Vendor (CNA)
Linux Linux6971cf319263d6a1b4096f9248aca9e57d77a1ebVendor (CNA)
Linux Linuxa4b82de96d465ddb44bc931145c0fa80c4fe9c9cVendor (CNA)
Linux Linuxe451e20adb869a983a21dda158625f024142e61fVendor (CNA)
Linux Linuxf9297abbcaba760b7a7b9d63b839f607f738013eVendor (CNA)
Linux Linuxfa86bc52ea8ba981f74f851fd61e2a3d3bc0feacVendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~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.

—

Bug bounty scope

No known public program.

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

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records