---
id: CVE-2026-74465
title: 'net: openvswitch: fix potential UAF on meter attach failure'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: openvswitch: fix potential UAF on meter attach failure

  While attaching a newly created meter attach_meter() function makes
  the new meter visible to other CPUs but…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 <
    496f3013c6ff759249abcfb2da2361c1a3e2e66d
  - >-
    Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 <
    ddc0ef4217cc697c6ba1a295cc1ea42423ec68ac
  - >-
    Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 <
    b0de3b58dac3b02b528f72ee0397728aed11f993
  - >-
    Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 <
    0310d1fa7f9debd0d89629e9f14c7975a47eaa9a
  - >-
    Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 <
    4d03e5fa3fbb1df15258a1eb3d6963f0d65659b3
  - >-
    Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 <
    90623c9499627803ef3f04fa25a3199402d4fb95
  - >-
    Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 <
    431a295d93f76fbdb6a7cfce92a9e3dfee1e5d61
  - >-
    Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 <
    a58a2b0ce354df531ebc71fc870058c2feb59f6b
  - Linux 5.8
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:57:07.565753Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:05:47.189Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74465'
references:
  - url: 'https://git.kernel.org/stable/c/496f3013c6ff759249abcfb2da2361c1a3e2e66d'
  - url: 'https://git.kernel.org/stable/c/ddc0ef4217cc697c6ba1a295cc1ea42423ec68ac'
  - url: 'https://git.kernel.org/stable/c/b0de3b58dac3b02b528f72ee0397728aed11f993'
  - url: 'https://git.kernel.org/stable/c/0310d1fa7f9debd0d89629e9f14c7975a47eaa9a'
  - url: 'https://git.kernel.org/stable/c/4d03e5fa3fbb1df15258a1eb3d6963f0d65659b3'
  - url: 'https://git.kernel.org/stable/c/90623c9499627803ef3f04fa25a3199402d4fb95'
  - url: 'https://git.kernel.org/stable/c/431a295d93f76fbdb6a7cfce92a9e3dfee1e5d61'
  - url: 'https://git.kernel.org/stable/c/a58a2b0ce354df531ebc71fc870058c2feb59f6b'
tags:
  - cve.org
epss: 0.00153
epssPercentile: 0.03988
ingestedAt: '2026-10-16T19:46:24.360Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

net: openvswitch: fix potential UAF on meter attach failure

While attaching a newly created meter attach_meter() function makes
the new meter visible to other CPUs but can still fail afterwards.
On failure, it detaches the meter back and returns an error.

However, this is an unexpected behavior for the ovs_meter_cmd_set()
that uses a plain kfree(meter) on attach failure without waiting for
RCU readers to stop using it, assuming it was never visible.

This is never a problem for ovs-vswitchd as it always creates meters
before creating any flows that use them.  But the UAF can be triggered
with a custom application using uAPI:

 BUG: KASAN: slab-use-after-free in ovs_meter_execute (net/openvswitch/meter.c:653)
 Read of size 8 at addr ffff88810d152650 by task meter/2508

 Call Trace:
  ovs_meter_execute (net/openvswitch/meter.c:653)
  do_execute_actions (net/openvswitch/actions.c:1407)
  ovs_execute_actions (net/openvswitch/actions.c:1584)
  ovs_packet_cmd_execute (net/openvswitch/datapath.c:703)
  ...
  netlink_sendmsg (af_netlink.c:1900)

 Allocated by task 2519:
  __kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415)
  ovs_meter_cmd_set (net/openvswitch/meter.c:422)
  ...
  netlink_sendmsg (af_netlink.c:1900)

 Freed by task 2519:
  kfree (mm/slub.c:2705 mm/slub.c:6405 mm/slub.c:6720)
  ovs_meter_cmd_set (net/openvswitch/meter.c:479)
  ...
  netlink_sendmsg (af_netlink.c:1900)

Fix that by making sure attach_meter() doesn't make the meter visible
until all the checks are done and the function can't fail anymore.

This also makes sure the "hash" value is calculated after the potential
re-sizing of the table.

Reported by Trend Micro's Zero Day Initiative as ZDI-CAN-31642.

## Affected

- `Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 < 496f3013c6ff759249abcfb2da2361c1a3e2e66d`
- `Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 < ddc0ef4217cc697c6ba1a295cc1ea42423ec68ac`
- `Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 < b0de3b58dac3b02b528f72ee0397728aed11f993`
- `Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 < 0310d1fa7f9debd0d89629e9f14c7975a47eaa9a`
- `Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 < 4d03e5fa3fbb1df15258a1eb3d6963f0d65659b3`
- `Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 < 90623c9499627803ef3f04fa25a3199402d4fb95`
- `Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 < 431a295d93f76fbdb6a7cfce92a9e3dfee1e5d61`
- `Linux >= c7c4c44c9a95d87e50ced38f7480e779cb472174 < a58a2b0ce354df531ebc71fc870058c2feb59f6b`
- `Linux 5.8`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.