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NVD / CVE Program· CNA Linux

CVE-2026-90114: net: bridge: Reject descending VLAN tunnel ranges

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 0874a6d5275091429ec4c675c54c53a8776665ae, 1181f6bad009408a259bab6aaf0681f11b487972, 434849b21ef56b09d16e6366b2a230002f363e45.

Low priority for now. Upgrade to Linux Linux 0874a6d5275091429ec4c675c54c53a8776665ae, 1181f6bad009408a259bab6aaf0681f11b487972, 434849b21ef56b09d16e6366b2a230002f363e45 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: bridge: Reject descending VLAN tunnel ranges A pair of descending VLAN and tunnel IDs can pass the tunnel range span check. The VLAN subtraction produces a negative int, which is converted to unsigned when compared with the u32 tunnel ID subtraction. It can therefore equal the wrapped tunnel ID delta. The range loop then performs no iterations. Since the batched notification handling added a post-loop error check, this leaves err uninitialized and makes the request's return value unpredictable. Reject descending VLAN ranges before comparing the spans. Valid ascending and single-entry ranges remain unchanged, while malformed descending ranges consistently return -EINVAL. This issue was found by a static analysis checker and confirmed by manual source review.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th 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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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.

—

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

    • 5.9affected
    • 94339443686b36d3223bc032b7947267474e2679 and later · before 1181f6bad009408a259bab6aaf0681f11b487972affected · git
    • 94339443686b36d3223bc032b7947267474e2679 and later · before 5a8e0e3a18b5e3172343b8479c5d04187f5b4795affected · git
    • 94339443686b36d3223bc032b7947267474e2679 and later · before 0874a6d5275091429ec4c675c54c53a8776665aeaffected · git
    • 94339443686b36d3223bc032b7947267474e2679 and later · before 4b0f5b25f114651f03058395b490626c4444875eaffected · git
    • 94339443686b36d3223bc032b7947267474e2679 and later · before bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17affected · git
    • 94339443686b36d3223bc032b7947267474e2679 and later · before c0444d7499f113d6b7803ef0175591464e17525eaffected · git
    • 94339443686b36d3223bc032b7947267474e2679 and later · before 434849b21ef56b09d16e6366b2a230002f363e45affected · git
    • 94339443686b36d3223bc032b7947267474e2679 and later · before b74a072d8fb71d3c9ffba4a17d5943e63266fb38affected · git
    • before 5.9not affected · 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-2026-90112Sep 17, 2026 · net: qlcnic: validate unified ROM sections before loading
    0Monitor
  • ← EarlierCVE-2026-90113Sep 17, 2026 · netdevsim: update queue NAPI association on queue reset
    0Monitor
  • Later →CVE-2026-90115Sep 17, 2026 · xsk: fix NULL pointer dereference in __xsk_rcv()
    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 Linux0874a6d5275091429ec4c675c54c53a8776665aeVendor (CNA)
Linux Linux1181f6bad009408a259bab6aaf0681f11b487972Vendor (CNA)
Linux Linux434849b21ef56b09d16e6366b2a230002f363e45Vendor (CNA)
Linux Linux4b0f5b25f114651f03058395b490626c4444875eVendor (CNA)
Linux Linux5a8e0e3a18b5e3172343b8479c5d04187f5b4795Vendor (CNA)
Linux Linuxb74a072d8fb71d3c9ffba4a17d5943e63266fb38Vendor (CNA)
Linux Linuxbd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17Vendor (CNA)
Linux Linuxc0444d7499f113d6b7803ef0175591464e17525eVendor (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.

—

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 (7 more)

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

All records