CVE-2022-50876

Kernel memory corruption via unchecked FIFO copy

Published Dec 30, 2025 · Updated Dec 30, 2025

An out-of-bounds write in Linux kernel MUSB gadget handling allows physically proximate attackers to corrupt kernel memory through USB data. In musb_gadget.c, rxstate copies the entire FIFO count into request->buf without limiting the copy to the request's remaining length. The path requires MUSB USB gadget operation with a non-DMA-mapped request longer than the endpoint packet size; the published record establishes memory corruption but no further consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in Linux kernel MUSB gadget handling allows physically proximate attackers to corrupt kernel memory through USB data. In musb_gadget.c, rxstate copies the entire FIFO count into request->buf without limiting the copy to the request's remaining length. The path requires MUSB USB gadget operation with a non-DMA-mapped request longer than the endpoint packet size; the published record establishes memory corruption but no further consequence.

The record

CVE
CVE-2022-50876
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
physical
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c84c7f592c4ba38f54ddaddd0115acc443025db
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <523313881f0aa5cbbdb548ce575b6e58b202bd76
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c80f3a918ba9aa26fb699ee887064ec3af0396a
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <826f84ab04a5cafe484ea9c2c85a3930068e5cb7
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1008c8b9f357691ce6a8fdb8f157aecb2d79167
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a9ccd2ab1becf5dcb6d57e9fcd981f5eaa606c96
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <acf0006f2b2b2ca672988875fd154429aafb2a9b
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d6afcab1b48f4051211c50145b9e91be3b1b42c9
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eea4c860c3b366369eff0489d94ee4f0571d467d

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c84c7f592c4ba38f54ddaddd0115acc443025db; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <523313881f0aa5cbbdb548ce575b6e58b202bd76; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c80f3a918ba9aa26fb699ee887064ec3af0396a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <826f84ab04a5cafe484ea9c2c85a3930068e5cb7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1008c8b9f357691ce6a8fdb8f157aecb2d79167; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a9ccd2ab1becf5dcb6d57e9fcd981f5eaa606c96; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <acf0006f2b2b2ca672988875fd154429aafb2a9b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d6afcab1b48f4051211c50145b9e91be3b1b42c9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eea4c860c3b366369eff0489d94ee4f0571d467d

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
PrivilegesUnavailable
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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Your stack

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