CVE-2026-31737

Service interruption via ring-allocation resource leak

Published May 1, 2026 · Updated May 1, 2026

Resource leak in the Linux Kernel ftgmac100 Ethernet driver allows local users to interrupt service during interface opening. ftgmac100_alloc_rings() returns directly when an intermediate allocation fails, leaving previously allocated descriptor rings, socket-buffer arrays, or scratch memory unreleased. Reachability requires the ftgmac100 driver and an allocation failure during device opening; each reachable failure consumes unreclaimed kernel memory and reduces availability.

CVSS severity6.9
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the Linux Kernel ftgmac100 Ethernet driver allows local users to interrupt service during interface opening. ftgmac100_alloc_rings() returns directly when an intermediate allocation fails, leaving previously allocated descriptor rings, socket-buffer arrays, or scratch memory unreleased. Reachability requires the ftgmac100 driver and an allocation failure during device opening; each reachable failure consumes unreclaimed kernel memory and reduces availability.

The record

CVE
CVE-2026-31737
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=4.12
  2. Affected versionversion=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <184b3a500d60ea48d1b176103cff1706c456edf3
  3. Affected versionversion=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <78da43320d9d6ed788147fb085184e4fc801f057
  4. Affected versionversion=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <82f86111f0704ab2ded11a2033bc6cf0be3e09ea
  5. Affected versionversion=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <8351d18989c8642fc53e2e12d94e42314a39b078
  6. Affected versionversion=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <8a71911fc7eeea930153322bc1efc065db8cd97e
  7. Affected versionversion=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <a7e1bf392acf11dc4209820fef75758f6e42bd65
  8. Affected versionversion=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <c0fd0fe745f5e8c568d898cd1513d0083e46204a
  9. Affected versionversion=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <d45230081f19c280096241353c26b0de457de795

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.12; version=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <184b3a500d60ea48d1b176103cff1706c456edf3; version=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <78da43320d9d6ed788147fb085184e4fc801f057; version=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <82f86111f0704ab2ded11a2033bc6cf0be3e09ea; version=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <8351d18989c8642fc53e2e12d94e42314a39b078; version=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <8a71911fc7eeea930153322bc1efc065db8cd97e; version=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <a7e1bf392acf11dc4209820fef75758f6e42bd65; version=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <c0fd0fe745f5e8c568d898cd1513d0083e46204a; version=d72e01a0430f8a1ae7adb3cbf0b2e73fcd99252e <d45230081f19c280096241353c26b0de457de795

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.9SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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