Linux Kernel up to 7.1.4 ALSA Sequencer snd_seq_read information disclosure

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.1.4. It has been rated as problematic. This affects the function snd_seq_read of the component ALSA Sequencer. The manipulation leads to information disclosure. This vulnerability is traded as CVE-2026-74339. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.1.4 and classified as problematic. This issue affects the function snd_seq_read of the component ALSA Sequencer. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Clear variable event pointer on read snd_seq_read() copies a queued variable-length event header to userspace before expanding the payload. Queued variable-length events use SNDRV_SEQ_EXT_CHAINED internally, and data.ext.ptr points at the first extension cell. The read side strips SNDRV_SEQ_EXT_* bits from data.ext.len before the copy, but it leaves data.ext.ptr untouched. A userspace sequencer client can therefore write a direct variable event to itself and read back the extension-cell kernel address from the returned header. Clear the temporary header pointer before copy_to_user(). The original queued event remains unchanged and is still passed to snd_seq_expand_var_event(), so payload expansion keeps using the internal chain.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-74339 since 08/15/2026. 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 $0-$5k at the moment (estimation calculated on 08/15/2026). The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc1 eliminates this vulnerability. Applying the patch 14fe4f75fd5309d6b75f8e840ada88912b374207/f29243c211928114f8b906e0a3fee77c236f14c8/e0c3edd86414534cfd179fefe45b38c29c01ae7a/6b52211eba213c461f68922708a99d8190c1fcd5/74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31b/c2ac9287e89916da684c2a548798351e63eb59ee/705dd6dcbc0ea87351c660c1a6443f85f1001c76 is able to eliminate this problem.

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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: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
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: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
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 5.15.212/6.1.178/6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc1
Patch: 14fe4f75fd5309d6b75f8e840ada88912b374207/f29243c211928114f8b906e0a3fee77c236f14c8/e0c3edd86414534cfd179fefe45b38c29c01ae7a/6b52211eba213c461f68922708a99d8190c1fcd5/74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31b/c2ac9287e89916da684c2a548798351e63eb59ee/705dd6dcbc0ea87351c660c1a6443f85f1001c76

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-2026-74339 (🔒)
GCVE (CVE): GCVE-0-2026-74339
GCVE (VulDB): GCVE-100-390299

Entryinfo

Created: 08/15/2026 09:39
Changes: 08/15/2026 09:39 (59)
Complete: 🔍
Cache ID: 216::103

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