CVE-2022-49661

DMA-memory exhaustion via unreleased RX URBs

Published Feb 26, 2025 · Updated May 11, 2026

Memory leak in the Linux kernel gs_usb CAN driver allows local users to exhaust DMA memory by repeatedly opening and closing an interface. gs_can_open allocates RX URBs and coherent DMA buffers, but gs_can_close only kills the anchored URBs instead of releasing them with usb_free_coherent. The path requires a compatible USB CAN adapter and permission to cycle its interface; continued repetition depletes DMA memory without reading or changing data.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux kernel gs_usb CAN driver allows local users to exhaust DMA memory by repeatedly opening and closing an interface. gs_can_open allocates RX URBs and coherent DMA buffers, but gs_can_close only kills the anchored URBs instead of releasing them with usb_free_coherent. The path requires a compatible USB CAN adapter and permission to cycle its interface; continued repetition depletes DMA memory without reading or changing data.

The record

CVE
CVE-2022-49661
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.16
  2. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <0e60230bc64355c80abe993d1719fdb318094e20
  3. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <2bda24ef95c0311ab93bda00db40486acf30bd0a
  4. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <339fa9f80d3b94177a7a459c6d115d3b56007d5a
  5. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <6f655b5e13fa4b27e915b6c209ac0da74fd75963
  6. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <c1d806bc29ff7ffe0e2a023583c8720ed96cb0b0
  7. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <d0b8e223998866b3e7b2895927d4e9689b0a80d8
  8. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <d91492638b054f4a359621ef216242be5973ed6b
  9. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <ffb6cc6601ec7c8fa963dcf76025df4a02f2cf5c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.16; version=d08e973a77d128b25e01a08c34d89593fdf222da <0e60230bc64355c80abe993d1719fdb318094e20; version=d08e973a77d128b25e01a08c34d89593fdf222da <2bda24ef95c0311ab93bda00db40486acf30bd0a; version=d08e973a77d128b25e01a08c34d89593fdf222da <339fa9f80d3b94177a7a459c6d115d3b56007d5a; version=d08e973a77d128b25e01a08c34d89593fdf222da <6f655b5e13fa4b27e915b6c209ac0da74fd75963; version=d08e973a77d128b25e01a08c34d89593fdf222da <c1d806bc29ff7ffe0e2a023583c8720ed96cb0b0; version=d08e973a77d128b25e01a08c34d89593fdf222da <d0b8e223998866b3e7b2895927d4e9689b0a80d8; version=d08e973a77d128b25e01a08c34d89593fdf222da <d91492638b054f4a359621ef216242be5973ed6b; version=d08e973a77d128b25e01a08c34d89593fdf222da <ffb6cc6601ec7c8fa963dcf76025df4a02f2cf5c

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.001OS Exhaustion Flood

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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