Linux Kernel up to 6.12.110/6.18.52 dpaa2-switch dpaa2_switch_port_set_fdb allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.11+

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.12.110/6.18.52. Affected by this issue is the function dpaa2_switch_port_set_fdb of the component dpaa2-switch. This manipulation causes allocation of resources. This vulnerability is tracked as CVE-2026-97436. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.110/6.18.52. It has been declared as critical. Affected by this vulnerability is the function dpaa2_switch_port_set_fdb of the component dpaa2-switch. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: rework FDB management on the bridge leave path On bridge leave, the dpaa2_switch_port_set_fdb() function always allocates a new FDB for the port which is becoming standalone. In case no FDB is found, then the port leaving a bridge will continue to use the current one. The above logic does not cover the case in which there are multiple bridges which have ports from the same DPSW instance. In this case, when the last port leaves bridge #1, it finds an unused FDB to switch to, but the old FDB is not marked as unused. Since the number of FDBs is equal to the number of DPSW interfaces, this will eventually lead to multiple ports sharing the same FDB. Fix this by changing how we are managing the FDBs on the leave path. Instead of directly allocating a new FDB, first verify if the current port is the last one to leave a bridge. If this is the case, then continue to use the current FDB and only allocate another FDB if there are other ports remaining in the bridge.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-97436 since 09/24/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/24/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 6.12.111 or 6.18.53 eliminates this vulnerability. Applying the patch abea361a11e4e48695ea149652ef5d3f308b6a49/5adbc4d02d7df8bd7aa02c21874f7a582a576b55/efc1d92eacf03afa6f4d53bf7120e059b6f961f2 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: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
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 6.12.111/6.18.53
Patch: abea361a11e4e48695ea149652ef5d3f308b6a49/5adbc4d02d7df8bd7aa02c21874f7a582a576b55/efc1d92eacf03afa6f4d53bf7120e059b6f961f2

Timelineinfo

09/24/2026 Advisory disclosed
09/24/2026 +0 days CVE reserved
09/24/2026 +0 days VulDB entry created
09/24/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-97436 (🔒)
GCVE (CVE): GCVE-0-2026-97436
GCVE (VulDB): GCVE-100-409597

Entryinfo

Created: 09/24/2026 19:33
Changes: 09/24/2026 19:33 (59)
Complete: 🔍
Cache ID: 216::103

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