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NVD / CVE Program· CNA Linux

CVE-2026-31502: team: fix header_ops type confusion with non-Ethernet ports

HighCVSS 7.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0, 20491d384d973a63fbdaf7a71e38d69b0659ea55, 420e5aad7ba89e8f79e2dc8327b0c0c24c1c1d53.

Low priority for now. Upgrade to Linux Linux 0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0, 20491d384d973a63fbdaf7a71e38d69b0659ea55, 420e5aad7ba89e8f79e2dc8327b0c0c24c1c1d53 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: team: fix header_ops type confusion with non-Ethernet ports Similar to commit 950803f72547 ("bonding: fix type confusion in bond_setup_by_slave()") team has the same class of header_ops type confusion. For non-Ethernet ports, team_setup_by_port() copies port_dev->header_ops directly. When the team device later calls dev_hard_header() or dev_parse_header(), these callbacks can run with the team net_device instead of the real lower device, so netdev_priv(dev) is interpreted as the wrong private type and can crash. The syzbot report shows a crash in bond_header_create(), but the root cause is in team: the topology is gre -> bond -> team, and team calls the inherited header_ops with its own net_device instead of the lower device, so bond_header_create() receives a team device and interprets netdev_priv() as bonding private data, causing a type confusion crash. Fix this by introducing team header_ops wrappers for create/parse, selecting a team port under RCU, and calling the lower device callbacks with port->dev, so each callback always sees the correct net_device context. Also pass the selected lower device to the lower parse callback, so recursion is bounded in stacked non-Ethernet topologies and parse callbacks always run with the correct device context.

Published
Apr 22, 2026
Updated
Nov 11, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Noroxi analysis

What does it mean in your environment?

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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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel3.7.1 and later · before 6.12.80
  • linux linux kernel6.13 and later · before 6.18.21
  • linux linux kernel6.19 and later · before 6.19.11
  • linux linux kernel3.7
  • linux linux kernel7.0

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

    • 3.7affected
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before c6e255b0ce30cdea37e34d6d87e2212eb8c7f7a4affected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before 420e5aad7ba89e8f79e2dc8327b0c0c24c1c1d53affected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before 6d3161fa3eee64d46b766fb0db33ec7f300ef52daffected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before 0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0affected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before 20491d384d973a63fbdaf7a71e38d69b0659ea55affected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before 425000dbf17373a4ab8be9428f5dc055ef870a56affected · git
    • before 3.7not affected · semver
    • 6.1.191 and later · up to and including 6.1.*not affected · semver
    • 6.6.145 and later · up to and including 6.6.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.11-16.19.11-1
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-azurebefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-default-basebefore 6.12.0-160000.36.1.160000.2.176.12.0-160000.36.1.160000.2.17
openSUSE:Leap 16.0kernel-docsbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-kvmsmallbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-obs-buildbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-obs-qabefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-rtbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-sourcebefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-symsbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-zfcpdumpbefore 6.12.0-160000.36.16.12.0-160000.36.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-64kbbefore 5.14.21-150400.24.240.25.14.21-150400.24.240.2
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-docsbefore 5.14.21-150400.24.240.15.14.21-150400.24.240.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-obs-buildbefore 5.14.21-150400.24.240.15.14.21-150400.24.240.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-symsbefore 5.14.21-150400.24.240.15.14.21-150400.24.240.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-64kbbefore 5.14.21-150500.55.189.15.14.21-150500.55.189.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-docsbefore 5.14.21-150500.55.189.15.14.21-150500.55.189.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-obs-buildbefore 5.14.21-150500.55.189.15.14.21-150500.55.189.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-symsbefore 5.14.21-150500.55.189.15.14.21-150500.55.189.1

+58

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-31500Apr 22, 2026 · Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock
    31Monitor
  • ← EarlierCVE-2026-31501Apr 22, 2026 · net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path
    39Monitor
  • Later →CVE-2026-31503Apr 22, 2026 · udp: Fix wildcard bind conflict check when using hash2
    22Monitor

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 Linux0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0Vendor (CNA)
Linux Linux20491d384d973a63fbdaf7a71e38d69b0659ea55Vendor (CNA)
Linux Linux420e5aad7ba89e8f79e2dc8327b0c0c24c1c1d53Vendor (CNA)
Linux Linux425000dbf17373a4ab8be9428f5dc055ef870a56Vendor (CNA)
Linux Linux6d3161fa3eee64d46b766fb0db33ec7f300ef52dVendor (CNA)
Linux Linuxc6e255b0ce30cdea37e34d6d87e2212eb8c7f7a4Vendor (CNA)
debian:linux6.12.85-1 · Debian:13Package registry (OSV)
opensuse:dtb-aarch646.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-64kb6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-azure6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default-base6.12.0-160000.36.1.160000.2.17 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-docs6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-kvmsmall6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-build6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-qa6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-rt6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-source6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-syms6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:kernel-64kb6.12.0-160000.36.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-azure6.12.0-160000.36.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-default6.4.0-49.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-default-base6.12.0-160000.36.1.160000.2.17 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-docs6.12.0-160000.36.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-kvmsmall6.4.0-49.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.36.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-obs-qa6.12.0-160000.36.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-rt6.4.0-49.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source6.4.0-49.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source-rt6.4.0-49.1 · SUSE:Linux Micro 6.0Package registry (OSV)

+1

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.

No history yet (it accumulates with the daily EPSS job).

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.

  • CVE-2026-4306213 days apartBluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()
    28Monitor

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).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

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. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (5 more)

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

All records