CVE-2026-72307

Local denial of service via VR rollback leak

Published Aug 15, 2026 · Updated Aug 15, 2026

Denial of service in the Linux mlxsw driver from 4.14 allows local users to exhaust resources by triggering failed VR replacements. The mlxsw_sp_vrs_lpm_tree_replace() rollback decrements its index without advancing the vr pointer, so earlier virtual routers retain references to new_tree. Low-privileged local access and a failed mlxsw virtual-router replacement are required; repeated failures leak resources and can make the system unresponsive.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux mlxsw driver from 4.14 allows local users to exhaust resources by triggering failed VR replacements. The mlxsw_sp_vrs_lpm_tree_replace() rollback decrements its index without advancing the vr pointer, so earlier virtual routers retain references to new_tree. Low-privileged local access and a failed mlxsw virtual-router replacement are required; repeated failures leak resources and can make the system unresponsive.

The record

CVE
CVE-2026-72307
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-911
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=4.14
  2. Affected versionversion=fc922bb0dd9406dd9897fd47df958789891c380e <21cf8dc478a49e8de039c2739b1646a774cb1944
  3. Affected versionversion=fc922bb0dd9406dd9897fd47df958789891c380e <220d41bdce41fe5a39a7f419faab1e907b4093c2
  4. Affected versionversion=fc922bb0dd9406dd9897fd47df958789891c380e <3a2b47d1b4b3de54d030a7fdb6a322c970513ee3
  5. Affected versionversion=fc922bb0dd9406dd9897fd47df958789891c380e <7203ac71d3895fa5948b319dd724f0e1cffbc4a1
  6. Affected versionversion=fc922bb0dd9406dd9897fd47df958789891c380e <8adebf07b46df79a0e49a6d4ae384f0db7c91db6
  7. Affected versionversion=fc922bb0dd9406dd9897fd47df958789891c380e <9e4a6185679922305ea1df68403f00ccc512656b
  8. Affected versionversion=fc922bb0dd9406dd9897fd47df958789891c380e <c2c75c45b54f3b12eafb28a4eb47f8821512c1aa
  9. Affected versionversion=fc922bb0dd9406dd9897fd47df958789891c380e <f6454a5fbf2224ad30ec70e686a6c592561da1f2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14; version=fc922bb0dd9406dd9897fd47df958789891c380e <21cf8dc478a49e8de039c2739b1646a774cb1944; version=fc922bb0dd9406dd9897fd47df958789891c380e <220d41bdce41fe5a39a7f419faab1e907b4093c2; version=fc922bb0dd9406dd9897fd47df958789891c380e <3a2b47d1b4b3de54d030a7fdb6a322c970513ee3; version=fc922bb0dd9406dd9897fd47df958789891c380e <7203ac71d3895fa5948b319dd724f0e1cffbc4a1; version=fc922bb0dd9406dd9897fd47df958789891c380e <8adebf07b46df79a0e49a6d4ae384f0db7c91db6; version=fc922bb0dd9406dd9897fd47df958789891c380e <9e4a6185679922305ea1df68403f00ccc512656b; version=fc922bb0dd9406dd9897fd47df958789891c380e <c2c75c45b54f3b12eafb28a4eb47f8821512c1aa; version=fc922bb0dd9406dd9897fd47df958789891c380e <f6454a5fbf2224ad30ec70e686a6c592561da1f2

Published CVSS scores

5.5OracleCVSS: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-911Improper Update of Reference Count

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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