---
id: CVE-2022-49870
title: 'capabilities: fix undefined behavior in bit shift for CAP_TO_MASK'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  capabilities: fix undefined behavior in bit shift for CAP_TO_MASK

  Shifting signed 32-bit value by 31 bits is undefined, so changing
  significant bit to unsigned. The UB…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e338d263a76af78fe8f38a72131188b58fceb591 <
    5b79fa628e2ab789e629a83cd211ef9b4c1a593e
  - >-
    Linux >= e338d263a76af78fe8f38a72131188b58fceb591 <
    65b0bc7a0690861812ade523d19f82688ab819dc
  - >-
    Linux >= e338d263a76af78fe8f38a72131188b58fceb591 <
    dbaab08c8677d598244d21afb7818e44e1c5d826
  - >-
    Linux >= e338d263a76af78fe8f38a72131188b58fceb591 <
    5661f111a1616ac105ec8cec81bff99b60f847ac
  - >-
    Linux >= e338d263a76af78fe8f38a72131188b58fceb591 <
    fcbd2b336834bd24e1d9454ad5737856470c10d7
  - >-
    Linux >= e338d263a76af78fe8f38a72131188b58fceb591 <
    151dc8087b5609e53b069c068e3f3ee100efa586
  - >-
    Linux >= e338d263a76af78fe8f38a72131188b58fceb591 <
    27bdb134c043ff32c459d98f16550d0ffa0b3c34
  - >-
    Linux >= e338d263a76af78fe8f38a72131188b58fceb591 <
    46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13
  - Linux 2.6.25
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T19:50:57.705224Z'
published: '2025-05-01'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:00:10.236Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-49870'
references:
  - url: 'https://git.kernel.org/stable/c/5b79fa628e2ab789e629a83cd211ef9b4c1a593e'
  - url: 'https://git.kernel.org/stable/c/65b0bc7a0690861812ade523d19f82688ab819dc'
  - url: 'https://git.kernel.org/stable/c/dbaab08c8677d598244d21afb7818e44e1c5d826'
  - url: 'https://git.kernel.org/stable/c/5661f111a1616ac105ec8cec81bff99b60f847ac'
  - url: 'https://git.kernel.org/stable/c/fcbd2b336834bd24e1d9454ad5737856470c10d7'
  - url: 'https://git.kernel.org/stable/c/151dc8087b5609e53b069c068e3f3ee100efa586'
  - url: 'https://git.kernel.org/stable/c/27bdb134c043ff32c459d98f16550d0ffa0b3c34'
  - url: 'https://git.kernel.org/stable/c/46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13'
tags:
  - cve.org
epss: 0.00223
epssPercentile: 0.13036
ingestedAt: '2026-11-05T22:38:31.620Z'
---

## Overview

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

capabilities: fix undefined behavior in bit shift for CAP_TO_MASK

Shifting signed 32-bit value by 31 bits is undefined, so changing
significant bit to unsigned. The UBSAN warning calltrace like below:

UBSAN: shift-out-of-bounds in security/commoncap.c:1252:2
left shift of 1 by 31 places cannot be represented in type 'int'
Call Trace:
 <TASK>
 dump_stack_lvl+0x7d/0xa5
 dump_stack+0x15/0x1b
 ubsan_epilogue+0xe/0x4e
 __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c
 cap_task_prctl+0x561/0x6f0
 security_task_prctl+0x5a/0xb0
 __x64_sys_prctl+0x61/0x8f0
 do_syscall_64+0x58/0x80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
 </TASK>

## Affected

- `Linux >= e338d263a76af78fe8f38a72131188b58fceb591 < 5b79fa628e2ab789e629a83cd211ef9b4c1a593e`
- `Linux >= e338d263a76af78fe8f38a72131188b58fceb591 < 65b0bc7a0690861812ade523d19f82688ab819dc`
- `Linux >= e338d263a76af78fe8f38a72131188b58fceb591 < dbaab08c8677d598244d21afb7818e44e1c5d826`
- `Linux >= e338d263a76af78fe8f38a72131188b58fceb591 < 5661f111a1616ac105ec8cec81bff99b60f847ac`
- `Linux >= e338d263a76af78fe8f38a72131188b58fceb591 < fcbd2b336834bd24e1d9454ad5737856470c10d7`
- `Linux >= e338d263a76af78fe8f38a72131188b58fceb591 < 151dc8087b5609e53b069c068e3f3ee100efa586`
- `Linux >= e338d263a76af78fe8f38a72131188b58fceb591 < 27bdb134c043ff32c459d98f16550d0ffa0b3c34`
- `Linux >= e338d263a76af78fe8f38a72131188b58fceb591 < 46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13`
- `Linux 2.6.25`

## Remediation

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