CVE-2026-74465

Kernel memory corruption via premature meter publication

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in the Linux kernel Open vSwitch meter code from 5.8 allows local users to access freed kernel memory through the uAPI. The attach_meter function publishes a new meter to RCU readers before all checks finish, while ovs_meter_cmd_set frees it immediately if a later check fails. A custom uAPI application must create a flow referencing the concurrently attached meter; the ordering used by ovs-vswitchd does not expose the flaw.

CVSS severity7.8
High
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

Use-after-free in the Linux kernel Open vSwitch meter code from 5.8 allows local users to access freed kernel memory through the uAPI. The attach_meter function publishes a new meter to RCU readers before all checks finish, while ovs_meter_cmd_set frees it immediately if a later check fails. A custom uAPI application must create a flow referencing the concurrently attached meter; the ordering used by ovs-vswitchd does not expose the flaw.

The record

CVE
CVE-2026-74465
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=5.8
  2. Affected versionversion=c7c4c44c9a95d87e50ced38f7480e779cb472174 <0310d1fa7f9debd0d89629e9f14c7975a47eaa9a
  3. Affected versionversion=c7c4c44c9a95d87e50ced38f7480e779cb472174 <431a295d93f76fbdb6a7cfce92a9e3dfee1e5d61
  4. Affected versionversion=c7c4c44c9a95d87e50ced38f7480e779cb472174 <4d03e5fa3fbb1df15258a1eb3d6963f0d65659b3
  5. Affected versionversion=c7c4c44c9a95d87e50ced38f7480e779cb472174 <90623c9499627803ef3f04fa25a3199402d4fb95
  6. Affected versionversion=c7c4c44c9a95d87e50ced38f7480e779cb472174 <a58a2b0ce354df531ebc71fc870058c2feb59f6b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=c7c4c44c9a95d87e50ced38f7480e779cb472174 <0310d1fa7f9debd0d89629e9f14c7975a47eaa9a; version=c7c4c44c9a95d87e50ced38f7480e779cb472174 <431a295d93f76fbdb6a7cfce92a9e3dfee1e5d61; version=c7c4c44c9a95d87e50ced38f7480e779cb472174 <4d03e5fa3fbb1df15258a1eb3d6963f0d65659b3; version=c7c4c44c9a95d87e50ced38f7480e779cb472174 <90623c9499627803ef3f04fa25a3199402d4fb95; version=c7c4c44c9a95d87e50ced38f7480e779cb472174 <a58a2b0ce354df531ebc71fc870058c2feb59f6b

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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