Linux Kernel up to 7.2.5 Bridge uninitialized variable

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.40

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.5. It has been classified as very critical. The affected element is an unknown function of the component Bridge. This manipulation causes uninitialized variable. This vulnerability is handled as CVE-2026-90114. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.2.5. Affected by this vulnerability is an unknown code block of the component Bridge. The manipulation with an unknown input leads to a uninitialized variable vulnerability. The CWE definition for the vulnerability is CWE-457. The code uses a variable that has not been initialized, leading to unpredictable or unintended results. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-90114 since 09/11/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 1181f6bad009408a259bab6aaf0681f11b487972/5a8e0e3a18b5e3172343b8479c5d04187f5b4795/0874a6d5275091429ec4c675c54c53a8776665ae/4b0f5b25f114651f03058395b490626c4444875e/bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17/c0444d7499f113d6b7803ef0175591464e17525e/434849b21ef56b09d16e6366b2a230002f363e45/b74a072d8fb71d3c9ffba4a17d5943e63266fb38 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uninitialized variable
CWE: CWE-457 / CWE-453
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.270/5.15.221/6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: 1181f6bad009408a259bab6aaf0681f11b487972/5a8e0e3a18b5e3172343b8479c5d04187f5b4795/0874a6d5275091429ec4c675c54c53a8776665ae/4b0f5b25f114651f03058395b490626c4444875e/bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17/c0444d7499f113d6b7803ef0175591464e17525e/434849b21ef56b09d16e6366b2a230002f363e45/b74a072d8fb71d3c9ffba4a17d5943e63266fb38

Timelineinfo

09/11/2026 CVE reserved
09/17/2026 +6 days Advisory disclosed
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-90114 (🔒)
GCVE (CVE): GCVE-0-2026-90114
GCVE (VulDB): GCVE-100-406621

Entryinfo

Created: 09/17/2026 19:28
Changes: 09/17/2026 19:28 (58)
Complete: 🔍
Cache ID: 216::103

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