---
id: CVE-2026-46089
title: 'zram: do not forget to endio for partial discard requests'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  zram: do not forget to endio for partial discard requests

  As reported by Qu Wenruo and Avinesh Kumar, the following

   getconf PAGESIZE
   65536
   blkdiscard -p 4k /dev/zr…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0120dd6e4e202e19a0e011e486fb2da40a5ea279 <
    2d1f18efccdb8b29552399d024c36b705447e975
  - >-
    Linux >= 0120dd6e4e202e19a0e011e486fb2da40a5ea279 <
    35d3300f6357cfaa72db2721dc2b345b19bac5df
  - >-
    Linux >= 0120dd6e4e202e19a0e011e486fb2da40a5ea279 <
    a02363f71a79b755daa78a70d6b217f9c13c8c85
  - >-
    Linux >= 0120dd6e4e202e19a0e011e486fb2da40a5ea279 <
    68ce397e8236088fc53b9532d383a722288c8194
  - >-
    Linux >= 0120dd6e4e202e19a0e011e486fb2da40a5ea279 <
    e3668b371329ea036ff022ce8ecc82f8befcf003
  - Linux 6.4
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:08:07.861895Z'
published: '2026-05-27'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:13:37.187Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-46089'
references:
  - url: 'https://git.kernel.org/stable/c/2d1f18efccdb8b29552399d024c36b705447e975'
  - url: 'https://git.kernel.org/stable/c/35d3300f6357cfaa72db2721dc2b345b19bac5df'
  - url: 'https://git.kernel.org/stable/c/a02363f71a79b755daa78a70d6b217f9c13c8c85'
  - url: 'https://git.kernel.org/stable/c/68ce397e8236088fc53b9532d383a722288c8194'
  - url: 'https://git.kernel.org/stable/c/e3668b371329ea036ff022ce8ecc82f8befcf003'
tags:
  - cve.org
epss: 0.00135
epssPercentile: 0.03021
ingestedAt: '2026-11-06T16:57:43.340Z'
---

## Overview

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

zram: do not forget to endio for partial discard requests

As reported by Qu Wenruo and Avinesh Kumar, the following

 getconf PAGESIZE
 65536
 blkdiscard -p 4k /dev/zram0

takes literally forever to complete.  zram doesn't support partial
discards and just returns immediately w/o doing any discard work in such
cases.  The problem is that we forget to endio on our way out, so
blkdiscard sleeps forever in submit_bio_wait().  Fix this by jumping to
end_bio label, which does bio_endio().

## Affected

- `Linux >= 0120dd6e4e202e19a0e011e486fb2da40a5ea279 < 2d1f18efccdb8b29552399d024c36b705447e975`
- `Linux >= 0120dd6e4e202e19a0e011e486fb2da40a5ea279 < 35d3300f6357cfaa72db2721dc2b345b19bac5df`
- `Linux >= 0120dd6e4e202e19a0e011e486fb2da40a5ea279 < a02363f71a79b755daa78a70d6b217f9c13c8c85`
- `Linux >= 0120dd6e4e202e19a0e011e486fb2da40a5ea279 < 68ce397e8236088fc53b9532d383a722288c8194`
- `Linux >= 0120dd6e4e202e19a0e011e486fb2da40a5ea279 < e3668b371329ea036ff022ce8ecc82f8befcf003`
- `Linux 6.4`

## Remediation

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