Linux Kernel up to 7.2-rc5 ALSA UMP snd_ump_attach_legacy_rawmidi out_cvts double free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$5k-$25k0.94+

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.150/6.12.102/6.18.43/7.1.7/7.2-rc5. It has been declared as very critical. Impacted is the function snd_ump_attach_legacy_rawmidi of the component ALSA UMP. Executing a manipulation of the argument out_cvts can lead to double free. This vulnerability is tracked as CVE-2026-74502. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.6.150/6.12.102/6.18.43/7.1.7/7.2-rc5 and classified as very critical. This vulnerability affects the function snd_ump_attach_legacy_rawmidi of the component ALSA UMP. The manipulation of the argument out_cvts with an unknown input leads to a double free vulnerability. The CWE definition for the vulnerability is CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ALSA: ump: fix double free of out_cvts on rawmidi error snd_ump_attach_legacy_rawmidi() allocates the legacy conversion array ump->out_cvts and, on the snd_rawmidi_new() error path, frees it with kfree() but leaves ump->out_cvts pointing at the freed memory. When the endpoint is later torn down, snd_ump_endpoint_free() frees ump->out_cvts a second time, resulting in a double free. The host snd-usb-audio driver attaches the legacy rawmidi for any USB MIDI 2.0 (UMP) device, so a device that makes snd_rawmidi_new() fail reaches this path on enumeration. Clear ump->out_cvts after freeing it on the error path so it is not freed again during teardown. Discovered by XBOW, triaged by Baul Lee <[email protected]>

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-74502 since 08/15/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 6.6.151, 6.12.103, 6.18.44, 7.1.8 or 7.2-rc6 eliminates this vulnerability. Applying the patch e84d2e53a05c78a04d1343eeb0f31a79456e79fc/3302aaeac4f7ee6b775850db21d5f61064ce70ad/032746c2dd9a4ea0774b04ac8a29e2ea628f106e/c57001f55f97ef856fb6527e376c5c4a056a53a4/70c977815af0d997feb2d0c5d284d55689bf7051 is able to eliminate this problem.

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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: 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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💳💳💳💳💳💳
💳💳💳💳💳💳
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 6.6.151/6.12.103/6.18.44/7.1.8/7.2-rc6
Patch: e84d2e53a05c78a04d1343eeb0f31a79456e79fc/3302aaeac4f7ee6b775850db21d5f61064ce70ad/032746c2dd9a4ea0774b04ac8a29e2ea628f106e/c57001f55f97ef856fb6527e376c5c4a056a53a4/70c977815af0d997feb2d0c5d284d55689bf7051

Timelineinfo

08/15/2026 Advisory disclosed
08/15/2026 +0 days CVE reserved
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74502 (🔒)
GCVE (CVE): GCVE-0-2026-74502
GCVE (VulDB): GCVE-100-390802

Entryinfo

Created: 08/15/2026 15:16
Changes: 08/15/2026 15:16 (60)
Complete: 🔍
Cache ID: 216::103

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