CVE-2022-48847Public exploit

Local privilege escalation via watch queue filter writes

Published Jul 16, 2024 · Updated Aug 5, 2026

Out-of-bounds writes in Linux kernel 5.8 and affected later releases allow local users to gain root through crafted watch queue filter types. In watch_queue_set_filter(), a type is checked against a bitmap size multiplied by BITS_PER_LONG, so __set_bit() indexes past type_filter and the loop writes more filters[] entries than were allocated. An unprivileged local account can reach the ioctl path without user interaction; heap corruption can disclose or modify kernel memory, grant root privileges, or crash, panic, or hang the host.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds writes in Linux kernel 5.8 and affected later releases allow local users to gain root through crafted watch queue filter types. In watch_queue_set_filter(), a type is checked against a bitmap size multiplied by BITS_PER_LONG, so __set_bit() indexes past type_filter and the loop writes more filters[] entries than were allocated. An unprivileged local account can reach the ioctl path without user interaction; heap corruption can disclose or modify kernel memory, grant root privileges, or crash, panic, or hang the host.

The record

CVE
CVE-2022-48847
Published
Jul 16, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.8
  2. Affected versionversion=c73be61cede5882f9605a852414db559c0ebedfd <1b09f28f70a5046acd64138075ae3f095238b045
  3. Affected versionversion=c73be61cede5882f9605a852414db559c0ebedfd <648895da69ced90ca770fd941c3d9479a9d72c16
  4. Affected versionversion=c73be61cede5882f9605a852414db559c0ebedfd <b36588ebbcef74583824c08352e75838d6fb4ff2
  5. Affected versionversion=c73be61cede5882f9605a852414db559c0ebedfd <c993ee0f9f81caf5767a50d1faeba39a0dc82af2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=c73be61cede5882f9605a852414db559c0ebedfd <1b09f28f70a5046acd64138075ae3f095238b045; version=c73be61cede5882f9605a852414db559c0ebedfd <648895da69ced90ca770fd941c3d9479a9d72c16; version=c73be61cede5882f9605a852414db559c0ebedfd <b36588ebbcef74583824c08352e75838d6fb4ff2; version=c73be61cede5882f9605a852414db559c0ebedfd <c993ee0f9f81caf5767a50d1faeba39a0dc82af2

Published CVSS scores

7.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

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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