---
id: CVE-2022-50497
title: 'binfmt_misc: fix shift-out-of-bounds in check_special_flags'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  binfmt_misc: fix shift-out-of-bounds in check_special_flags

  UBSAN reported a shift-out-of-bounds warning:

   left shift of 1 by 31 places cannot be represented in type …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    0f1a48994b3e516d5c7fd5d12204fdba7a604771
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    ea6145370be8016755c43aca799815fc4b8c88b1
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    97382a2639b1cd9631f6069061e9d7062cd2b098
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    419b808504c26b3e3342365f34ccd0843e09a7f8
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    dcbc51d31d0afbd45e830e3cf565a7b3ca7bf0d8
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    88cea1676a09f7c45a1438153a126610c33b1590
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    a651bb5ff997b9f02662bcdef3d8b4e6f0d79656
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    a91123d4bda463469f68f0427adabf8108001f94
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    6a46bf558803dd2b959ca7435a5c143efe837217
  - Linux 2.6.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:12:21.226990Z'
published: '2025-10-04'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:20:49.239Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-50497'
references:
  - url: 'https://git.kernel.org/stable/c/0f1a48994b3e516d5c7fd5d12204fdba7a604771'
  - url: 'https://git.kernel.org/stable/c/ea6145370be8016755c43aca799815fc4b8c88b1'
  - url: 'https://git.kernel.org/stable/c/97382a2639b1cd9631f6069061e9d7062cd2b098'
  - url: 'https://git.kernel.org/stable/c/419b808504c26b3e3342365f34ccd0843e09a7f8'
  - url: 'https://git.kernel.org/stable/c/dcbc51d31d0afbd45e830e3cf565a7b3ca7bf0d8'
  - url: 'https://git.kernel.org/stable/c/88cea1676a09f7c45a1438153a126610c33b1590'
  - url: 'https://git.kernel.org/stable/c/a651bb5ff997b9f02662bcdef3d8b4e6f0d79656'
  - url: 'https://git.kernel.org/stable/c/a91123d4bda463469f68f0427adabf8108001f94'
  - url: 'https://git.kernel.org/stable/c/6a46bf558803dd2b959ca7435a5c143efe837217'
tags:
  - cve.org
epss: 0.00167
epssPercentile: 0.05964
ingestedAt: '2026-11-05T22:38:31.744Z'
---

## Overview

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

binfmt_misc: fix shift-out-of-bounds in check_special_flags

UBSAN reported a shift-out-of-bounds warning:

 left shift of 1 by 31 places cannot be represented in type 'int'
 Call Trace:
  <TASK>
  __dump_stack lib/dump_stack.c:88 [inline]
  dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106
  ubsan_epilogue+0xa/0x44 lib/ubsan.c:151
  __ubsan_handle_shift_out_of_bounds+0x1e7/0x208 lib/ubsan.c:322
  check_special_flags fs/binfmt_misc.c:241 [inline]
  create_entry fs/binfmt_misc.c:456 [inline]
  bm_register_write+0x9d3/0xa20 fs/binfmt_misc.c:654
  vfs_write+0x11e/0x580 fs/read_write.c:582
  ksys_write+0xcf/0x120 fs/read_write.c:637
  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
  do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80
  entry_SYSCALL_64_after_hwframe+0x63/0xcd
 RIP: 0033:0x4194e1

Since the type of Node's flags is unsigned long, we should define these
macros with same type too.

## Affected

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0f1a48994b3e516d5c7fd5d12204fdba7a604771`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ea6145370be8016755c43aca799815fc4b8c88b1`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 97382a2639b1cd9631f6069061e9d7062cd2b098`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 419b808504c26b3e3342365f34ccd0843e09a7f8`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < dcbc51d31d0afbd45e830e3cf565a7b3ca7bf0d8`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 88cea1676a09f7c45a1438153a126610c33b1590`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a651bb5ff997b9f02662bcdef3d8b4e6f0d79656`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a91123d4bda463469f68f0427adabf8108001f94`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6a46bf558803dd2b959ca7435a5c143efe837217`
- `Linux 2.6.12`

## Remediation

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