CVE-2022-49870

Kernel warning via signed capability-mask shift

Published May 1, 2025 · Updated May 11, 2026

Undefined behavior in Linux 2.6.25 through 6.1-rc4 allows local users to trigger a UBSAN kernel warning through a prctl capability query. The CAP_TO_MASK macro forms bit 31 by left-shifting signed integer 1, which is not representable as an int and reaches security/commoncap.c through cap_task_prctl(). Local low-privileged access is required; observable impact is the warning, while service interruption depends on warning-panic configuration.

CVSS severity7.1
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Undefined behavior in Linux 2.6.25 through 6.1-rc4 allows local users to trigger a UBSAN kernel warning through a prctl capability query. The CAP_TO_MASK macro forms bit 31 by left-shifting signed integer 1, which is not representable as an int and reaches security/commoncap.c through cap_task_prctl(). Local low-privileged access is required; observable impact is the warning, while service interruption depends on warning-panic configuration.

The record

CVE
CVE-2022-49870
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.25
  2. Affected versionversion=e338d263a76af78fe8f38a72131188b58fceb591 <151dc8087b5609e53b069c068e3f3ee100efa586
  3. Affected versionversion=e338d263a76af78fe8f38a72131188b58fceb591 <27bdb134c043ff32c459d98f16550d0ffa0b3c34
  4. Affected versionversion=e338d263a76af78fe8f38a72131188b58fceb591 <46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13
  5. Affected versionversion=e338d263a76af78fe8f38a72131188b58fceb591 <5661f111a1616ac105ec8cec81bff99b60f847ac
  6. Affected versionversion=e338d263a76af78fe8f38a72131188b58fceb591 <5b79fa628e2ab789e629a83cd211ef9b4c1a593e
  7. Affected versionversion=e338d263a76af78fe8f38a72131188b58fceb591 <65b0bc7a0690861812ade523d19f82688ab819dc
  8. Affected versionversion=e338d263a76af78fe8f38a72131188b58fceb591 <dbaab08c8677d598244d21afb7818e44e1c5d826
  9. Affected versionversion=e338d263a76af78fe8f38a72131188b58fceb591 <fcbd2b336834bd24e1d9454ad5737856470c10d7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.25; version=e338d263a76af78fe8f38a72131188b58fceb591 <151dc8087b5609e53b069c068e3f3ee100efa586; version=e338d263a76af78fe8f38a72131188b58fceb591 <27bdb134c043ff32c459d98f16550d0ffa0b3c34; version=e338d263a76af78fe8f38a72131188b58fceb591 <46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13; version=e338d263a76af78fe8f38a72131188b58fceb591 <5661f111a1616ac105ec8cec81bff99b60f847ac; version=e338d263a76af78fe8f38a72131188b58fceb591 <5b79fa628e2ab789e629a83cd211ef9b4c1a593e; version=e338d263a76af78fe8f38a72131188b58fceb591 <65b0bc7a0690861812ade523d19f82688ab819dc; version=e338d263a76af78fe8f38a72131188b58fceb591 <dbaab08c8677d598244d21afb7818e44e1c5d826; version=e338d263a76af78fe8f38a72131188b58fceb591 <fcbd2b336834bd24e1d9454ad5737856470c10d7

Published CVSS scores

7.1UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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