CVE-2022-25636Public exploit

Local privilege escalation via undersized offload array

Published Feb 22, 2022 · Updated Aug 3, 2024

A heap out-of-bounds write in Linux kernel 5.4 through 5.6.10 allows local users to gain privileges via crafted nftables rules. nft_fwd_dup_netdev_offload indexes flow->rule->action.entries for each dup or fwd expression, but allocation omits those expressions and leaves the array undersized. Reachability requires CAP_NET_ADMIN, which unprivileged users can obtain inside a new network namespace; exploitation can panic the kernel or elevate privileges.

CVSS severity7.8
High
EPSS probability2.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A heap out-of-bounds write in Linux kernel 5.4 through 5.6.10 allows local users to gain privileges via crafted nftables rules. nft_fwd_dup_netdev_offload indexes flow->rule->action.entries for each dup or fwd expression, but allocation omits those expressions and leaves the array undersized. Reachability requires CAP_NET_ADMIN, which unprivileged users can obtain inside a new network namespace; exploitation can panic the kernel or elevate privileges.

The record

CVE
CVE-2022-25636
Published
Feb 22, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8UbuntuCVSS: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 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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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