CVE-2026-31658

Kernel memory exhaustion via leaked transmit buffers

Published Apr 24, 2026 · Updated Apr 24, 2026

Memory leak in the Linux Kernel Altera TSE driver allows local users to consume kernel memory when DMA packet mapping fails. In tse_start_xmit(), a failed dma_map_single() call returns NETDEV_TX_OK without freeing the consumed skb, leaking one transmit buffer per failure. Exploitation requires access to transmit through an affected Altera TSE interface and repeated mapping failures; no data disclosure or modification is reported.

CVSS severity5.5
Medium
EPSS probability0.12%
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 Altera TSE driver allows local users to consume kernel memory when DMA packet mapping fails. In tse_start_xmit(), a failed dma_map_single() call returns NETDEV_TX_OK without freeing the consumed skb, leaking one transmit buffer per failure. Exploitation requires access to transmit through an affected Altera TSE interface and repeated mapping failures; no data disclosure or modification is reported.

The record

CVE
CVE-2026-31658
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=3.15
  2. Affected versionversion=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <2eb9d67704ca8f1101f7435b85f113ede471f9f2
  3. Affected versionversion=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <3aca300e88afe56afb000cdc4c65383014fb17f9
  4. Affected versionversion=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <60f462cd2716d86bd2174f9d5e035c9278f30480
  5. Affected versionversion=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <6dede3967619b5944003227a5d09fdc21ed57d10
  6. Affected versionversion=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <9f3ec44aeb58501d11834048d5d0dbaeacb6d4e7
  7. Affected versionversion=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <ae2cd46f57f422b51aedd406ff5d75cbff401d5d
  8. Affected versionversion=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <cb1d318702fdf643061350d164250198df4116f2
  9. Affected versionversion=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <d5ec406f0543bd6cdfd563b08015fdec8c4d5712

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.15; version=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <2eb9d67704ca8f1101f7435b85f113ede471f9f2; version=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <3aca300e88afe56afb000cdc4c65383014fb17f9; version=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <60f462cd2716d86bd2174f9d5e035c9278f30480; version=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <6dede3967619b5944003227a5d09fdc21ed57d10; version=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <9f3ec44aeb58501d11834048d5d0dbaeacb6d4e7; version=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <ae2cd46f57f422b51aedd406ff5d75cbff401d5d; version=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <cb1d318702fdf643061350d164250198df4116f2; version=bbd2190ce96d8fce031f0526c1f970b68adc9d1a <d5ec406f0543bd6cdfd563b08015fdec8c4d5712

Published CVSS scores

5.5NIST NVDCVSS: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
T1499Endpoint Denial of Service

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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