---
id: CVE-2026-43494
title: 'net/rds: reset op_nents when zerocopy page pin fails'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/rds: reset op_nents when zerocopy page pin fails

  When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(),
  the pinned pages are released with put_page(), …
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 >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <
    c6e51512a784c4a7b86e1a044988696e3b3721fa
  - >-
    Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <
    03014551938a0887fa55f18ce49b70158a9c0113
  - >-
    Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <
    d84ce1786ce40fdd3dd98db47aec5527817e1ef6
  - >-
    Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <
    9115669faedccdda100428e2d26fd0aac8c50799
  - >-
    Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <
    0bbbff00a15b1df2cac9014d6cf4b6890f473353
  - >-
    Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <
    640e37f58f991546a87540d067279c2c1fa9fe51
  - >-
    Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <
    290e833d1acb1093bc121fcdc97f5e6161157479
  - >-
    Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <
    e174929793195e0cd6a4adb0cad731b39f9019b4
  - Linux 4.17
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:17:47.906032Z'
exploitAvailable: true
published: '2026-05-21'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:20:43.142Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43494'
references:
  - url: 'https://git.kernel.org/stable/c/c6e51512a784c4a7b86e1a044988696e3b3721fa'
  - url: 'https://git.kernel.org/stable/c/03014551938a0887fa55f18ce49b70158a9c0113'
  - url: 'https://git.kernel.org/stable/c/d84ce1786ce40fdd3dd98db47aec5527817e1ef6'
  - url: 'https://git.kernel.org/stable/c/9115669faedccdda100428e2d26fd0aac8c50799'
  - url: 'https://git.kernel.org/stable/c/0bbbff00a15b1df2cac9014d6cf4b6890f473353'
  - url: 'https://git.kernel.org/stable/c/640e37f58f991546a87540d067279c2c1fa9fe51'
  - url: 'https://git.kernel.org/stable/c/290e833d1acb1093bc121fcdc97f5e6161157479'
  - url: 'https://git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4'
  - url: 'https://github.com/v12-security/pocs/tree/main/pintheft'
tags:
  - cve.org
  - exploit-available
epss: 0.00194
epssPercentile: 0.08536
exploits:
  github: 7
  githubRepos:
    - 'https://github.com/0xBlackash/CVE-2026-43494'
    - 'https://github.com/jayhutajulu1/CVE-2026-43494-PinTheft-PoC'
    - 'https://github.com/Koshmare-Blossom/PinTheft-asm'
  checkedAt: '2026-10-16T17:25:21.011Z'
ingestedAt: '2026-10-16T17:24:46.697Z'
---

## Overview

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

net/rds: reset op_nents when zerocopy page pin fails

When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(),
the pinned pages are released with put_page(), and
rm->data.op_mmp_znotifier is cleared.  But we fail to properly
clear rm->data.op_nents.

Later when rds_message_purge() is called from rds_sendmsg() the
cleanup loop iterates over the incorrectly non zero number of
op_nents and frees them again.

Fix this by properly resetting op_nents when it should be in
rds_message_zcopy_from_user().

## Affected

- `Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 < c6e51512a784c4a7b86e1a044988696e3b3721fa`
- `Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 < 03014551938a0887fa55f18ce49b70158a9c0113`
- `Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 < d84ce1786ce40fdd3dd98db47aec5527817e1ef6`
- `Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 < 9115669faedccdda100428e2d26fd0aac8c50799`
- `Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 < 0bbbff00a15b1df2cac9014d6cf4b6890f473353`
- `Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 < 640e37f58f991546a87540d067279c2c1fa9fe51`
- `Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 < 290e833d1acb1093bc121fcdc97f5e6161157479`
- `Linux >= 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 < e174929793195e0cd6a4adb0cad731b39f9019b4`
- `Linux 4.17`

## Remediation

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