CVE-2026-72436
netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier guarantees. Use test_bit_acquire() instead where the operation may run parallel with add/del/gc, i.e. is not one from the next cases - protected by region lock - in a set destroy phase - in a new/temporary set creation phase
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 15, 2026, 6:22 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-72436
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.
No affected product recoded yet
Solution
- Update the Linux kernel to a patched version.
- Apply the netfilter ipset fix.
- Use test_bit_acquire() in RCU readers.
- Ensure proper locking mechanisms.
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-2026-72436.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72436 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-2026-72436
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-2026-72436 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72436 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.
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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': '18f84d41d34fa35d0d64bbaea01fe664553ecc06', 'lessThan': 'c107233d2ff4fd7cef5d02f9124b99194957a710', 'versionType': 'git'}, {'status': 'affected', 'version': '18f84d41d34fa35d0d64bbaea01fe664553ecc06', 'lessThan': '6329d3a9afe715fddda0460cfa46b496d61c2fe0', 'versionType': 'git'}, {'status': 'affected', 'version': '18f84d41d34fa35d0d64bbaea01fe664553ecc06', 'lessThan': '7445fe965b7d8756070a40e80f8b73348ccda1d7', 'versionType': 'git'}, {'status': 'affected', 'version': '18f84d41d34fa35d0d64bbaea01fe664553ecc06', 'lessThan': 'c4d257734e91bfcdc71d41843392dd6400b5bb1b', 'versionType': 'git'}, {'status': 'affected', 'version': '18f84d41d34fa35d0d64bbaea01fe664553ecc06', 'lessThan': '3219d74e4536658c937fd878a327257b86ce80dd', 'versionType': 'git'}, {'status': 'affected', 'version': '18f84d41d34fa35d0d64bbaea01fe664553ecc06', 'lessThan': 'e4b4984e28c16406ecb318444dea4a8bf47def3e', 'versionType': 'git'}], 'programFiles': ['net/netfilter/ipset/ip_set_hash_gen.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.2'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', '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-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/ipset/ip_set_hash_gen.h'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier guarantees. Use test_bit_acquire() instead where the operation may run parallel with add/del/gc, i.e. is not one from the next cases - protected by region lock - in a set destroy phase - in a new/temporary set creation phase Added Reference https://git.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80dd Added Reference https://git.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0 Added Reference https://git.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7 Added Reference https://git.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710 Added Reference https://git.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1b Added Reference https://git.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e