CVE-2026-53087Network attack vector

Network interruption via leaked TX descriptor credits

Published Jun 24, 2026 · Updated Jun 24, 2026

Resource exhaustion in the Linux kernel's bcmgenet driver allows attackers to interrupt network transmission on affected systems. During TX-queue reclamation, bcmgenet advances the write pointer without returning dropped frames' buffer descriptors to free_bds or reporting the drops, so repeated reclamation drains descriptor credits. The CNA treats remote traffic as reachable, but Canonical reports that interface-down and suspend triggers require CAP_NET_ADMIN or root and that attackers cannot induce the hardware timeout.

CVSS severity7.5
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in the Linux kernel's bcmgenet driver allows attackers to interrupt network transmission on affected systems. During TX-queue reclamation, bcmgenet advances the write pointer without returning dropped frames' buffer descriptors to free_bds or reporting the drops, so repeated reclamation drains descriptor credits. The CNA treats remote traffic as reachable, but Canonical reports that interface-down and suspend triggers require CAP_NET_ADMIN or root and that attackers cannot induce the hardware timeout.

The record

CVE
CVE-2026-53087
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3877efc13053408f4cf2e821006d6ddd1929200f <3c3abbcfa05bad17965498ff7cc94c2418fa94b3
  2. Affected versionversion=6.15
  3. Affected versionversion=6a84791b63044cdee3ab55eb350e6352b751f584 <150d06aae1839a6564ab200ef0e7291c3528bbb0
  4. Affected versionversion=991cd78f95f2a1d6097669afaff66aeeba35f5fd <52b9f80993698138b90e5ca3a72550a2501f2a96
  5. Affected versionversion=f1bacae8b655163dcbc3c54b9e714ef1a8986d7b <25ff3a3e47ea635ec08dc93e84dd2bfe15abfebb
  6. Affected versionversion=f1bacae8b655163dcbc3c54b9e714ef1a8986d7b <3f3168300efb839028328d720ab3962f91d6a0d0
  7. Affected versionversion=f1bacae8b655163dcbc3c54b9e714ef1a8986d7b <ac4a29c331ecb5b10240c44247a8e010c95bc15b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3877efc13053408f4cf2e821006d6ddd1929200f <3c3abbcfa05bad17965498ff7cc94c2418fa94b3; version=6.15; version=6a84791b63044cdee3ab55eb350e6352b751f584 <150d06aae1839a6564ab200ef0e7291c3528bbb0; version=991cd78f95f2a1d6097669afaff66aeeba35f5fd <52b9f80993698138b90e5ca3a72550a2501f2a96; version=f1bacae8b655163dcbc3c54b9e714ef1a8986d7b <25ff3a3e47ea635ec08dc93e84dd2bfe15abfebb; version=f1bacae8b655163dcbc3c54b9e714ef1a8986d7b <3f3168300efb839028328d720ab3962f91d6a0d0; version=f1bacae8b655163dcbc3c54b9e714ef1a8986d7b <ac4a29c331ecb5b10240c44247a8e010c95bc15b

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
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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