Unknown

CVE-2026-80906 — net: packet: fix wrong transport_header when sending VLAN-tagged frame

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.

Published Sep 4, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.17%

ahead of 6% of scored CVEs · Oct 25, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ c2137d565ceb505de69593c181a0543bc4083838 and < a4b82de96d465ddb44bc931145c0fa80c4fe9c9c≥ 9ff46c36df2e0a1ac352f2f4038eaf3f0f7361b8 and < fa86bc52ea8ba981f74f851fd61e2a3d3bc0feac≥ dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and < 5479eb9b355f44745d7ccfe112386bd4f96eceea≥ dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and < e451e20adb869a983a21dda158625f024142e61f≥ dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and < 6971cf319263d6a1b4096f9248aca9e57d77a1eb≥ dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and < f9297abbcaba760b7a7b9d63b839f607f738013e≥ dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and < 6386a6ffa2efba2965ed8e4fa303582c0b76a215≥ dfed913e8b55a0c2c4906f1242fd38fd9a116e49 and < 01fdecc0480d916c799dbee584833a4a37e94d06 and 5 more version ad3f90a9c4a2c74bb3711f2031bffda4ec44c849≥ 5.10.163 and < 5.10.266≥ 5.15.87 and < 5.15.217≥ 5.4.229 and < 5.5version 5.19	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 25, 2026 · 10 reading(s) · max 0.17%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 4, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/a4b82de96d465ddb44bc931145c0fa80c4fe9c9c
NIST National Vulnerability Database
git.kernel.org/stable/c/f9297abbcaba760b7a7b9d63b839f607f738013e
NIST National Vulnerability Database
git.kernel.org/stable/c/6386a6ffa2efba2965ed8e4fa303582c0b76a215
NIST National Vulnerability Database
git.kernel.org/stable/c/5479eb9b355f44745d7ccfe112386bd4f96eceea
NIST National Vulnerability Database
git.kernel.org/stable/c/fa86bc52ea8ba981f74f851fd61e2a3d3bc0feac
NIST National Vulnerability Database
git.kernel.org/stable/c/6971cf319263d6a1b4096f9248aca9e57d77a1eb
NIST National Vulnerability Database
git.kernel.org/stable/c/e451e20adb869a983a21dda158625f024142e61f
NIST National Vulnerability Database
git.kernel.org/stable/c/01fdecc0480d916c799dbee584833a4a37e94d06
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99092 riscv: patch: fix handling of bpf-jit execmem addresses 2h
Unknown CVE-2026-99093 mm: don't schedule deferred kernel page table freeing while booting 2h
Unknown CVE-2026-99095 drm/vc4: drain the hangcheck timer and works on V3D unbind 2h
Unknown CVE-2026-99096 io_uring/register: don't exempt disabled rings from task restrictions 2h
Unknown CVE-2026-99097 tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper() 2h
Unknown CVE-2026-99098 dm-integrity: fix buffer overflow in inline mode with large tag size 2h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-80906 is "net: packet: fix wrong transport_header when sending VLAN-tagged frame", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.17% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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