Linux Kernel up to 6.12.108/6.18.49/7.2.3 Thunderbolt tbnet_connected_work allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00+

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.12.108/6.18.49/7.2.3. Affected is the function tbnet_connected_work of the component Thunderbolt. Such manipulation leads to allocation of resources. This vulnerability is traded as CVE-2026-80990. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.108/6.18.49/7.2.3 and classified as critical. Affected by this issue is the function tbnet_connected_work of the component Thunderbolt. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: net: thunderbolt: Release the Rx HopID that was handed out on mismatch tb_xdomain_alloc_in_hopid() passes the wanted HopID to ida_alloc_range() as the lower bound, so a taken id is not an error there: the allocator returns the next free one above it. tbnet_connected_work() asks for the peer's transmit path, treats any other id as a failure and returns without releasing what it got, so that allocation stays live for the rest of the XDomain connection with nothing left holding a reference to it. Release the id when it is not the one we asked for, the same way the error unwind at the end of the function releases the expected one.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-80990 since 08/26/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/12/2026). The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 6.12.109, 6.18.50, 7.2.4 or 7.3-rc1 eliminates this vulnerability. Applying the patch 9eac1817bfc5fa76e3a2d1b8fd824cc6ef5a9ab0/61ff3c353e5d2ff4eb9d0b6d8d9e47805b136eea/1c361f6cf39be7cc0ce37c0b67bd1cdf74b0a0c1/2f1463554d0561a2fead81e3888604e5c1125e29 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: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
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 6.12.109/6.18.50/7.2.4/7.3-rc1
Patch: 9eac1817bfc5fa76e3a2d1b8fd824cc6ef5a9ab0/61ff3c353e5d2ff4eb9d0b6d8d9e47805b136eea/1c361f6cf39be7cc0ce37c0b67bd1cdf74b0a0c1/2f1463554d0561a2fead81e3888604e5c1125e29

Timelineinfo

08/26/2026 CVE reserved
09/11/2026 +16 days VulDB entry created
09/12/2026 +0 days Advisory disclosed
09/12/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80990 (🔒)
GCVE (CVE): GCVE-0-2026-80990
GCVE (VulDB): GCVE-100-402764

Entryinfo

Created: 09/12/2026 00:22
Changes: 09/12/2026 00:22 (59)
Complete: 🔍
Cache ID: 216::103

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