CVE-2026-90378

Memory consumption via unreleased SDIO transmit buffers

Published Sep 17, 2026 · Updated Sep 17, 2026

Memory leakage in the mt792x SDIO driver in Linux 5.12 allows attackers to consume memory via rejected transmit frames. In drivers/net/wireless/mediatek/mt76/sdio.c, mt76s_tx_queue_skb returns when tx_prepare_skb fails without releasing the socket buffer, including when zero-length frames are rejected. Exposure requires the affected SDIO transmit path; repeated failures retain kernel memory, but the upstream disclosure does not establish an attacker-controlled trigger or a resulting crash or hang.

CVSS severity3.3
Low
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in the mt792x SDIO driver in Linux 5.12 allows attackers to consume memory via rejected transmit frames. In drivers/net/wireless/mediatek/mt76/sdio.c, mt76s_tx_queue_skb returns when tx_prepare_skb fails without releasing the socket buffer, including when zero-length frames are rejected. Exposure requires the affected SDIO transmit path; repeated failures retain kernel memory, but the upstream disclosure does not establish an attacker-controlled trigger or a resulting crash or hang.

The record

CVE
CVE-2026-90378
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.12
  2. Affected versionversion=b747fa343817fd322b4463dda99d28fc51e19c52 <6a342db7a6502bc6781579145e05d4d4731786ab
  3. Affected versionversion=b747fa343817fd322b4463dda99d28fc51e19c52 <6a8000c76dc34490a2bb321ad1a5f882a2ccab7c
  4. Affected versionversion=b747fa343817fd322b4463dda99d28fc51e19c52 <808f2767d4217a5b96f674288573b9b89d432eed
  5. Affected versionversion=b747fa343817fd322b4463dda99d28fc51e19c52 <9ef1351209d42b7d96604f2a13d7ea8215a24e07
  6. Affected versionversion=b747fa343817fd322b4463dda99d28fc51e19c52 <b64d196280aff8494ba6fb387e37b18479c99b83
  7. Affected versionversion=b747fa343817fd322b4463dda99d28fc51e19c52 <c2c7f16f2c62f79f7c381e500afa7123580742a5
  8. Affected versionversion=b747fa343817fd322b4463dda99d28fc51e19c52 <ddf6a17d8e3d0dbb841c13c10d7c1340a138a80d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.12; version=b747fa343817fd322b4463dda99d28fc51e19c52 <6a342db7a6502bc6781579145e05d4d4731786ab; version=b747fa343817fd322b4463dda99d28fc51e19c52 <6a8000c76dc34490a2bb321ad1a5f882a2ccab7c; version=b747fa343817fd322b4463dda99d28fc51e19c52 <808f2767d4217a5b96f674288573b9b89d432eed; version=b747fa343817fd322b4463dda99d28fc51e19c52 <9ef1351209d42b7d96604f2a13d7ea8215a24e07; version=b747fa343817fd322b4463dda99d28fc51e19c52 <b64d196280aff8494ba6fb387e37b18479c99b83; version=b747fa343817fd322b4463dda99d28fc51e19c52 <c2c7f16f2c62f79f7c381e500afa7123580742a5; version=b747fa343817fd322b4463dda99d28fc51e19c52 <ddf6a17d8e3d0dbb841c13c10d7c1340a138a80d

Published CVSS scores

3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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