---
id: CVE-2026-68157
title: 'libceph: guard missing CRUSH type name lookup'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  libceph: guard missing CRUSH type name lookup

  Localized read selection can walk a parent bucket whose name exists in
  the CRUSH map while its type has no matching entry…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 <
    cbfcba275326c8c7dae9acd8f4a0d4c316fdafb0
  - >-
    Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 <
    8ff579ac03d6e9d17d6d9c8443110167c14a382d
  - >-
    Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 <
    6a4b75d90f0cfbf22c14742ab35a803bc13f36ec
  - >-
    Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 <
    c46d82c47afc968d6ee8ef4470fa2dd35b765c21
  - >-
    Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 <
    3767c9f0c1bbd98dd25cb088356a0fc6c1f09f50
  - >-
    Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 <
    4716a64b7cc2797741f7be4e283ace78a9dff37d
  - >-
    Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 <
    db9cc9fd9660b2d69ee66f5a4cbec83c21a1c64d
  - >-
    Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 <
    bbeae12fda3384a90fbebc8a19ba9d33f85b5361
  - Linux 5.8
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T15:45:12.675517Z'
published: '2026-08-10'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:53:01.207Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68157'
references:
  - url: 'https://git.kernel.org/stable/c/cbfcba275326c8c7dae9acd8f4a0d4c316fdafb0'
  - url: 'https://git.kernel.org/stable/c/8ff579ac03d6e9d17d6d9c8443110167c14a382d'
  - url: 'https://git.kernel.org/stable/c/6a4b75d90f0cfbf22c14742ab35a803bc13f36ec'
  - url: 'https://git.kernel.org/stable/c/c46d82c47afc968d6ee8ef4470fa2dd35b765c21'
  - url: 'https://git.kernel.org/stable/c/3767c9f0c1bbd98dd25cb088356a0fc6c1f09f50'
  - url: 'https://git.kernel.org/stable/c/4716a64b7cc2797741f7be4e283ace78a9dff37d'
  - url: 'https://git.kernel.org/stable/c/db9cc9fd9660b2d69ee66f5a4cbec83c21a1c64d'
  - url: 'https://git.kernel.org/stable/c/bbeae12fda3384a90fbebc8a19ba9d33f85b5361'
tags:
  - cve.org
epss: 0.00696
epssPercentile: 0.52051
ingestedAt: '2026-10-16T17:24:46.849Z'
---

## Overview

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

libceph: guard missing CRUSH type name lookup

Localized read selection can walk a parent bucket whose name exists in
the CRUSH map while its type has no matching entry in type_names.
get_immediate_parent() then dereferences a NULL type_cn and passes an
invalid pointer into strcmp(), causing a null-ptr-deref.

Skip such malformed parent buckets unless both the bucket name and type
name metadata are present. This keeps malformed hierarchy data from
crashing locality lookup and safely falls back to "not local".

[ idryomov: add WARN_ON_ONCE ]

## Affected

- `Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 < cbfcba275326c8c7dae9acd8f4a0d4c316fdafb0`
- `Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 < 8ff579ac03d6e9d17d6d9c8443110167c14a382d`
- `Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 < 6a4b75d90f0cfbf22c14742ab35a803bc13f36ec`
- `Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 < c46d82c47afc968d6ee8ef4470fa2dd35b765c21`
- `Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 < 3767c9f0c1bbd98dd25cb088356a0fc6c1f09f50`
- `Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 < 4716a64b7cc2797741f7be4e283ace78a9dff37d`
- `Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 < db9cc9fd9660b2d69ee66f5a4cbec83c21a1c64d`
- `Linux >= 117d96a04f007ce8fc2e292369056c3bd09f6f63 < bbeae12fda3384a90fbebc8a19ba9d33f85b5361`
- `Linux 5.8`

## Remediation

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