CVE-2026-90114 — net: bridge: Reject descending VLAN tunnel ranges
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.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.2% (30-day exploitation probability)+2
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.
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 |
≥ 94339443686b36d3223bc032b7947267474e2679 and < 1181f6bad009408a259bab6aaf0681f11b487972≥ 94339443686b36d3223bc032b7947267474e2679 and < 5a8e0e3a18b5e3172343b8479c5d04187f5b4795≥ 94339443686b36d3223bc032b7947267474e2679 and < 0874a6d5275091429ec4c675c54c53a8776665ae≥ 94339443686b36d3223bc032b7947267474e2679 and < 4b0f5b25f114651f03058395b490626c4444875e≥ 94339443686b36d3223bc032b7947267474e2679 and < bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17≥ 94339443686b36d3223bc032b7947267474e2679 and < c0444d7499f113d6b7803ef0175591464e17525e≥ 94339443686b36d3223bc032b7947267474e2679 and < 434849b21ef56b09d16e6366b2a230002f363e45≥ 94339443686b36d3223bc032b7947267474e2679 and < b74a072d8fb71d3c9ffba4a17d5943e63266fb38 and 1 moreversion 5.9 |
Vulnerable | CVE Program (cve.org) e CISA ADP |
EPSS over time FIRST
Oct 15, 2026 → Oct 18, 2026 · 3 reading(s) · max 0.22%
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.
Timeline
What happened to this CVE, newest first.
- 2026
- Record published
- Affected products added · linux/linux
- Source status changed · → Received
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× References added · Oct 19, 2026 – Oct 19, 2026
- 1× Official description updated · Oct 15, 2026 – Oct 15, 2026
References
10 on the record
- github.com/advisories/GHSA-3m56-382v-r3qq
- git.kernel.org/stable/c/bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17
- git.kernel.org/stable/c/c0444d7499f113d6b7803ef0175591464e17525e
- nvd.nist.gov/vuln/detail/CVE-2026-90114
- git.kernel.org/stable/c/0874a6d5275091429ec4c675c54c53a8776665ae
- git.kernel.org/stable/c/4b0f5b25f114651f03058395b490626c4444875e
- git.kernel.org/stable/c/b74a072d8fb71d3c9ffba4a17d5943e63266fb38
- git.kernel.org/stable/c/5a8e0e3a18b5e3172343b8479c5d04187f5b4795
- git.kernel.org/stable/c/1181f6bad009408a259bab6aaf0681f11b487972
- git.kernel.org/stable/c/434849b21ef56b09d16e6366b2a230002f363e45
Elsewhere on this site
Related CVEs (same products)
- Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 1d
- Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 1d
- Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 1d
- Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 1d
- Unknown CVE-2026-98857 ipvs: bound LBLCR and LBLC cache growth 1d
- Unknown CVE-2026-98858 io_uring: fix task_work add use-after-free with SQPOLL 1d
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-2026-90114 is "net: bridge: Reject descending VLAN tunnel ranges", 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 0.22% 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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