CVE-2022-48999

Kernel memory disclosure and crash via route deletion

Published Oct 21, 2024 · Updated Aug 5, 2026

Out-of-bounds read in the Linux IPv4 routing subsystem allows local users to disclose kernel memory or crash the system. fib_nh_match processes a legacy multipath route-deletion specification against fib_info backed by a separate nexthop object, then indexes beyond the associated nexthop array. A local user with route-administration capability must issue the crafted deletion request; the failure can expose kernel memory and interrupt the host.

CVSS severity7.1
High
EPSS probability0.26%
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 read in the Linux IPv4 routing subsystem allows local users to disclose kernel memory or crash the system. fib_nh_match processes a legacy multipath route-deletion specification against fib_info backed by a separate nexthop object, then indexes beyond the associated nexthop array. A local user with route-administration capability must issue the crafted deletion request; the failure can expose kernel memory and interrupt the host.

The record

CVE
CVE-2022-48999
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 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=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <0b5394229ebae09afc07aabccb5ffd705ffd250e
  2. Affected versionversion=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <25174d91e4a32a24204060d283bd5fa6d0ddf133
  3. Affected versionversion=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <61b91eb33a69c3be11b259c5ea484505cd79f883
  4. Affected versionversion=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <bb20a2ae241be846bc3c11ea4b3a3c69e41d51f2
  5. Affected versionversion=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <cc3cd130ecfb8b0ae52e235e487bae3f16a24a32
  6. Affected versionversion=5.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <0b5394229ebae09afc07aabccb5ffd705ffd250e; version=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <25174d91e4a32a24204060d283bd5fa6d0ddf133; version=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <61b91eb33a69c3be11b259c5ea484505cd79f883; version=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <bb20a2ae241be846bc3c11ea4b3a3c69e41d51f2; version=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <cc3cd130ecfb8b0ae52e235e487bae3f16a24a32; version=5.3

Published CVSS scores

7.1Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1kernel.orgCVSS: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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