---
id: CVE-2026-80880
title: 'IB/mlx5: Properly support implicit ODP rereg_mr'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  IB/mlx5: Properly support implicit ODP rereg_mr

  Due to all the child mkeys in the implicit ODP configuration we cannot
  change anything in place for the parent mkey. In…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 <
    cbc9982c8573fb9e35040063aa78c8ebe768a1ff
  - >-
    Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 <
    ee914ef54a7e707453ecb43eb30fb0a5c6dd0d69
  - >-
    Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 <
    94f7e50eb6b2ce7fbd9aeac1db22460d2013a3fb
  - >-
    Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 <
    eb7cb798e563b3f3b3baeb9cc6f7455764267e50
  - >-
    Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 <
    d4f84bfa089fe71f775d25beb29303e844494c25
  - >-
    Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 <
    5d02b9a2efd11d28d2a8feac7769686b1b871d9c
  - >-
    Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 <
    ee7a8335069150c3f1893a697ab30bbeca00d796
  - Linux 5.11
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T17:04:15.909437Z'
published: '2026-09-04'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T17:05:55.659Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80880'
references:
  - url: 'https://git.kernel.org/stable/c/cbc9982c8573fb9e35040063aa78c8ebe768a1ff'
  - url: 'https://git.kernel.org/stable/c/ee914ef54a7e707453ecb43eb30fb0a5c6dd0d69'
  - url: 'https://git.kernel.org/stable/c/94f7e50eb6b2ce7fbd9aeac1db22460d2013a3fb'
  - url: 'https://git.kernel.org/stable/c/eb7cb798e563b3f3b3baeb9cc6f7455764267e50'
  - url: 'https://git.kernel.org/stable/c/d4f84bfa089fe71f775d25beb29303e844494c25'
  - url: 'https://git.kernel.org/stable/c/5d02b9a2efd11d28d2a8feac7769686b1b871d9c'
  - url: 'https://git.kernel.org/stable/c/ee7a8335069150c3f1893a697ab30bbeca00d796'
tags:
  - cve.org
epss: 0.00161
epssPercentile: 0.05322
ingestedAt: '2026-11-06T18:00:12.530Z'
---

## Overview

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

IB/mlx5: Properly support implicit ODP rereg_mr

Due to all the child mkeys in the implicit ODP configuration we cannot
change anything in place for the parent mkey. Instead the whole thing
needs to be rebuilt if any change is requested. If the user does not
specify a translation then force the implicit values which will then fall
through the logic into mlx5_ib_reg_user_mr() to allocate a completely new
MR.

Since implicit children were also touching the mr->pd, this removes
another case where the access was racy.

## Affected

- `Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 < cbc9982c8573fb9e35040063aa78c8ebe768a1ff`
- `Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 < ee914ef54a7e707453ecb43eb30fb0a5c6dd0d69`
- `Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 < 94f7e50eb6b2ce7fbd9aeac1db22460d2013a3fb`
- `Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 < eb7cb798e563b3f3b3baeb9cc6f7455764267e50`
- `Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 < d4f84bfa089fe71f775d25beb29303e844494c25`
- `Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 < 5d02b9a2efd11d28d2a8feac7769686b1b871d9c`
- `Linux >= ef3642c4f54d3493c92c71faf46139b2473bc532 < ee7a8335069150c3f1893a697ab30bbeca00d796`
- `Linux 5.11`

## Remediation

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