---
id: CVE-2026-80558
title: 'libceph: Avoid using invalid osd indices from primary_temp'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  libceph: Avoid using invalid osd indices from primary_temp

  A corrupted osdmap received from a Ceph monitor or OSD may contain osd
  indices in its pg_temp, primary_temp,…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 <
    505fc50b8ff8e687b7e3ef6866269dea27366224
  - >-
    Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 <
    1c705fe8e59c6b16f48964973fb23c8ec4735b73
  - >-
    Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 <
    dfe1877d351b99eb1b1a62a3fc2d174220e88e20
  - >-
    Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 <
    e2ffeec85201b2bb748e99e12539ee1b92f62796
  - >-
    Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 <
    6799d4a916ffcb3d450d8440f9fe0f0862f768d6
  - >-
    Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 <
    4f392fec075562dc93bb0c69f37423ca2af9b48f
  - >-
    Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 <
    e009c5f0ad634c62f5c48a41f1f3c019ecf52555
  - >-
    Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 <
    3660b98d1204b419f6a77e9a295f148dcf38d042
  - Linux 3.15
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-16T19:17:27.873915Z'
published: '2026-08-26'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:26:27.095Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80558'
references:
  - url: 'https://git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224'
  - url: 'https://git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73'
  - url: 'https://git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20'
  - url: 'https://git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796'
  - url: 'https://git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6'
  - url: 'https://git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f'
  - url: 'https://git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555'
  - url: 'https://git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042'
tags:
  - cve.org
epss: 0.00514
epssPercentile: 0.42491
ingestedAt: '2026-10-16T19:46:24.314Z'
---

## Overview

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

libceph: Avoid using invalid osd indices from primary_temp

A corrupted osdmap received from a Ceph monitor or OSD may contain osd
indices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts
that don't exist, i.e., that are greater than max_osd or smaller than
CEPH_HOMELESS_OSD (-1). These indices are used to create the up and
acting set in ceph_pg_to_up_acting_osds(), called from calc_target().
While most of these osd indices are checked, the one from primary_temp
is not. Subsequently, this may lead to calc_target() returning this
(potentially invalid) index as target osd for a (linger) request.
Because the osd_state, osd_weight, and osd_addr arrays only contain
max_osd entries (with indices 0 to max_osd -1), this leads to
out-of-bounds accesses when trying to read values from these arrays.

This patch fixes the issue by adding a check to get_temp_osds(), so that
only valid osd indices from primary_temp are used, and it falls back to
using the primary from pg_temp or the up set if it is invalid.

[ idryomov: changelog ]

## Affected

- `Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 < 505fc50b8ff8e687b7e3ef6866269dea27366224`
- `Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 < 1c705fe8e59c6b16f48964973fb23c8ec4735b73`
- `Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 < dfe1877d351b99eb1b1a62a3fc2d174220e88e20`
- `Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 < e2ffeec85201b2bb748e99e12539ee1b92f62796`
- `Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 < 6799d4a916ffcb3d450d8440f9fe0f0862f768d6`
- `Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 < 4f392fec075562dc93bb0c69f37423ca2af9b48f`
- `Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 < e009c5f0ad634c62f5c48a41f1f3c019ecf52555`
- `Linux >= 5e8d4d36bf23bb7baf027c479d54395840219928 < 3660b98d1204b419f6a77e9a295f148dcf38d042`
- `Linux 3.15`

## Remediation

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