---
id: CVE-2026-98777
title: 'binder: fix leaked fd fixups on TF_UPDATE_TXN supersede'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  binder: fix leaked fd fixups on TF_UPDATE_TXN supersede

  When a TF_UPDATE_TXN transaction supersedes a pending async transaction
  in a frozen process, the outdated trans…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9864bb4801331daa48514face9d0f4861e4d485b <
    7fd609fb0e9dcbc4d7a1e4da1af5368c0555ff55
  - >-
    Linux >= 9864bb4801331daa48514face9d0f4861e4d485b <
    1299cb3fb061598496086fc87ff291057831148e
  - >-
    Linux >= 9864bb4801331daa48514face9d0f4861e4d485b <
    6673f4f21e2fddfed0abe1eb9045cc958e6db130
  - >-
    Linux >= 9864bb4801331daa48514face9d0f4861e4d485b <
    c4c02084d6687d5cd5edccaf52cc45e5160f1184
  - Linux 6.0
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:48:13.993Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98777'
references:
  - url: 'https://git.kernel.org/stable/c/7fd609fb0e9dcbc4d7a1e4da1af5368c0555ff55'
  - url: 'https://git.kernel.org/stable/c/1299cb3fb061598496086fc87ff291057831148e'
  - url: 'https://git.kernel.org/stable/c/6673f4f21e2fddfed0abe1eb9045cc958e6db130'
  - url: 'https://git.kernel.org/stable/c/c4c02084d6687d5cd5edccaf52cc45e5160f1184'
tags:
  - cve.org
ingestedAt: '2026-10-18T16:47:32.490Z'
---

## Overview

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

binder: fix leaked fd fixups on TF_UPDATE_TXN supersede

When a TF_UPDATE_TXN transaction supersedes a pending async transaction
in a frozen process, the outdated transaction is freed with kfree()
directly. This skips binder_free_txn_fixups(), leaking all
binder_txn_fd_fixup entries and their fget()'d struct file references.

The leaked file refcounts never reach zero, so the struct file objects
are permanently pinned in memory. They survive process exit and
accumulate across invocations until file-max exhaustion.

Every other transaction cleanup path (binder_free_transaction(),
binder_transaction() error paths, binder_release_work()) correctly
calls binder_free_txn_fixups(). Add the missing call before kfree()
in the t_outdated cleanup block.

## Affected

- `Linux >= 9864bb4801331daa48514face9d0f4861e4d485b < 7fd609fb0e9dcbc4d7a1e4da1af5368c0555ff55`
- `Linux >= 9864bb4801331daa48514face9d0f4861e4d485b < 1299cb3fb061598496086fc87ff291057831148e`
- `Linux >= 9864bb4801331daa48514face9d0f4861e4d485b < 6673f4f21e2fddfed0abe1eb9045cc958e6db130`
- `Linux >= 9864bb4801331daa48514face9d0f4861e4d485b < c4c02084d6687d5cd5edccaf52cc45e5160f1184`
- `Linux 6.0`

## Remediation

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