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7.8
HIGH CVSS 3.1
CVE-2026-72252
netfilter: nft_set_pipapo: don't leak bad clone into future transaction
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_pipapo: don't leak bad clone into future transaction On memory allocation failure the cloned nft_pipapo_match can enter a bad state: - some fields can have their lookup tables resized while others did not - bits might have been toggled - scratch map can be undersized which also means m->bsize_max can be lower than what is required This means that the next insertion in the same batch can trigger out-of-bounds writes. Furthermore, a failure in the first can result in the bad clone to leak into the next transaction because the abort callback is never executed in this case (the upper layer saw an error and no attempt to allocate a transactional request was made). Record a state for the nft_pipapo_match structure: - NEW (pristine clone) - MOD (modified clone with good state) - ERR (potentially bogus content) Then make it so that deletes and insertions fail when the clone entered ERR state. In case the very first insert attempt results in an error, free the clone right away.

Details
INFO

Published Date :

Aug. 15, 2026, 6:21 a.m.

Last Modified :

Aug. 17, 2026, 6:18 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-72252 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Update the Linux kernel to prevent out-of-bounds writes on memory allocation failure.
  • Update the Linux kernel to the latest stable version.
  • Apply the specific patch for netfilter: nft_set_pipapo.
  • Free the clone immediately if the first insert attempt fails.
  • Prevent operations on ERR state clones.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-72252.

URL Resource
https://git.kernel.org/stable/c/02b6b0e892aea582590671796fd6eff5b93ea93f
https://git.kernel.org/stable/c/047e813324eac2ac60cddfb58bcdbd0144eadb09
https://git.kernel.org/stable/c/47e65eff50691f0a5b79d325e28d83ec1da43bcf
https://git.kernel.org/stable/c/610e3b73efaec3dd81a95dcda2421ad7d9795bd0
https://git.kernel.org/stable/c/e74f9680e1b64872a51cc7b5bda1edaaa08aa51f
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-72252 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-72252 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-72252 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-72252 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '047e813324eac2ac60cddfb58bcdbd0144eadb09', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '610e3b73efaec3dd81a95dcda2421ad7d9795bd0', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '02b6b0e892aea582590671796fd6eff5b93ea93f', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': 'e74f9680e1b64872a51cc7b5bda1edaaa08aa51f', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '47e65eff50691f0a5b79d325e28d83ec1da43bcf', 'versionType': 'git'}], 'programFiles': ['net/netfilter/nft_set_pipapo.c', 'net/netfilter/nft_set_pipapo.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.6'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.6', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/nft_set_pipapo.c', 'net/netfilter/nft_set_pipapo.h'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '047e813324eac2ac60cddfb58bcdbd0144eadb09', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '610e3b73efaec3dd81a95dcda2421ad7d9795bd0', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '02b6b0e892aea582590671796fd6eff5b93ea93f', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': 'e74f9680e1b64872a51cc7b5bda1edaaa08aa51f', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '47e65eff50691f0a5b79d325e28d83ec1da43bcf', 'versionType': 'git'}], 'programFiles': ['net/netfilter/nft_set_pipapo.c', 'net/netfilter/nft_set_pipapo.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.6'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.6', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/nft_set_pipapo.c', 'net/netfilter/nft_set_pipapo.h'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 15, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '047e813324eac2ac60cddfb58bcdbd0144eadb09', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '610e3b73efaec3dd81a95dcda2421ad7d9795bd0', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '02b6b0e892aea582590671796fd6eff5b93ea93f', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': 'e74f9680e1b64872a51cc7b5bda1edaaa08aa51f', 'versionType': 'git'}, {'status': 'affected', 'version': '3c4287f62044a90e73a561aa05fc46e62da173da', 'lessThan': '47e65eff50691f0a5b79d325e28d83ec1da43bcf', 'versionType': 'git'}], 'programFiles': ['net/netfilter/nft_set_pipapo.c', 'net/netfilter/nft_set_pipapo.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.6'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.6', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/nft_set_pipapo.c', 'net/netfilter/nft_set_pipapo.h'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_pipapo: don't leak bad clone into future transaction On memory allocation failure the cloned nft_pipapo_match can enter a bad state: - some fields can have their lookup tables resized while others did not - bits might have been toggled - scratch map can be undersized which also means m->bsize_max can be lower than what is required This means that the next insertion in the same batch can trigger out-of-bounds writes. Furthermore, a failure in the first can result in the bad clone to leak into the next transaction because the abort callback is never executed in this case (the upper layer saw an error and no attempt to allocate a transactional request was made). Record a state for the nft_pipapo_match structure: - NEW (pristine clone) - MOD (modified clone with good state) - ERR (potentially bogus content) Then make it so that deletes and insertions fail when the clone entered ERR state. In case the very first insert attempt results in an error, free the clone right away.
    Added Reference https://git.kernel.org/stable/c/02b6b0e892aea582590671796fd6eff5b93ea93f
    Added Reference https://git.kernel.org/stable/c/047e813324eac2ac60cddfb58bcdbd0144eadb09
    Added Reference https://git.kernel.org/stable/c/47e65eff50691f0a5b79d325e28d83ec1da43bcf
    Added Reference https://git.kernel.org/stable/c/610e3b73efaec3dd81a95dcda2421ad7d9795bd0
    Added Reference https://git.kernel.org/stable/c/e74f9680e1b64872a51cc7b5bda1edaaa08aa51f
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.8
Attack Vector
Attack Complexity
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