Linux Kernel up to 7.2.4 Cobalt snd_cobalt_card_create private_data/private_free double free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.44

Summaryinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.4. The affected element is the function snd_cobalt_card_create of the component Cobalt. The manipulation of the argument private_data/private_free leads to double free. This vulnerability is traded as CVE-2026-89895. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2.4. It has been rated as very critical. This issue affects the function snd_cobalt_card_create of the component Cobalt. The manipulation of the argument private_data/private_free with an unknown input leads to a double free vulnerability. Using CWE to declare the problem leads to CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: media: cobalt: Avoid freeing ALSA private data twice snd_cobalt_card_create() stores cobsc in sc->private_data and installs snd_cobalt_card_private_free() as sc->private_free. From that point, snd_card_free(sc) releases cobsc through the ALSA card cleanup path. If cobalt_alsa_init() fails after snd_cobalt_card_create(), the err_exit_free path calls snd_card_free(sc) and then kfree(cobsc). That second free releases the same object again. Remove the explicit kfree(cobsc) and leave ownership with the ALSA card. This issue was found by a static analysis checker and confirmed by manual source review.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-89895 since 09/11/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/16/2026).

Upgrading to version 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5 or 7.3-rc1 eliminates this vulnerability. Applying the patch 75bbf45e3a954e292ae26832d2df40ca2e3ee452/fe65028ee72a7e07e572b351891bd7a1f8917d33/61dfa8ded5efc3a25d331fa9ce5cebb85531fe70/42e00371f83c3fc7b99a36bf0229c74ad5d3c7d8/6cbc8a73b3464ebeccc49987b7233b6b087b8504/cb1218da234ea15fa14d90e2d049d686874d7aa3/8c6610e230b9355cf7df5a338a0592c0f088c00b/3a7d6b9c4cb5ac18cbd3f1c7f8c7b159c42ba0b1 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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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
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: Double free
CWE: CWE-415 / CWE-119
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 5.10.270/5.15.221/6.1.188/6.6.157/6.12.110/6.18.51/7.2.5/7.3-rc1
Patch: 75bbf45e3a954e292ae26832d2df40ca2e3ee452/fe65028ee72a7e07e572b351891bd7a1f8917d33/61dfa8ded5efc3a25d331fa9ce5cebb85531fe70/42e00371f83c3fc7b99a36bf0229c74ad5d3c7d8/6cbc8a73b3464ebeccc49987b7233b6b087b8504/cb1218da234ea15fa14d90e2d049d686874d7aa3/8c6610e230b9355cf7df5a338a0592c0f088c00b/3a7d6b9c4cb5ac18cbd3f1c7f8c7b159c42ba0b1

Timelineinfo

09/11/2026 CVE reserved
09/16/2026 +5 days Advisory disclosed
09/16/2026 +0 days VulDB entry created
09/16/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-89895 (🔒)
GCVE (CVE): GCVE-0-2026-89895
GCVE (VulDB): GCVE-100-405719

Entryinfo

Created: 09/16/2026 14:12
Changes: 09/16/2026 14:12 (60)
Complete: 🔍
Cache ID: 216::103

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