CVE-2026-72435: netfilter: ipset: fix order of kfree_rcu() and rcu_assign_pointer()
In the Linux kernel, the following vulnerability has been resolved:
netfilter: ipset: fix order of kfreercu() and rcuassignpointer()
Sashiko pointed out that kfreercu() was called before rcuassignpointer() in handling the comment extension. Fix the order so that rcuassignpointer() called first.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-aws-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1067.70+fips1 - Upgrade
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ubuntu/linux-azure-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1071.79+fips1 - Upgrade
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1071.79+fips1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 7.0.0-38.38 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 7.0.0-1014.14 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 7.0.0-1017.17 - Upgrade
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ubuntu/linux-azure-fdeto a version that resolves this vulnerability.Fixed in 7.0.0-1016.16 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 7.0.0-1014.14 - Upgrade
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ubuntu/linux-gketo a version that resolves this vulnerability.Fixed in 7.0.0-1008.9 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 7.0.0-1015.15 - Upgrade
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ubuntu/linux-oem-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-1015.15 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 7.0.0-1013.13 - Upgrade
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ubuntu/linux-realtimeto a version that resolves this vulnerability.Fixed in 7.0.0-38.38.1 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-38.38.1 - Compensating control
In netfilter ipset comment-extension handling, call rcu_assign_pointer() before kfree_rcu().
Event History
Frequently Asked Questions
What is the severity of CVE-2026-72435?
The severity of CVE-2026-72435 is classified as risk 27.
How do I fix CVE-2026-72435?
To fix CVE-2026-72435, ensure that the order of kfree_rcu() and rcu_assign_pointer() in the code is corrected as per the patch provided in the Linux kernel updates.
What component of the software is affected by CVE-2026-72435?
CVE-2026-72435 affects the ipset component of the netfilter within the Linux kernel.
When was CVE-2026-72435 published?
CVE-2026-72435 was published on August 15, 2026.
What does CVE-2026-72435 address specifically?
CVE-2026-72435 addresses a vulnerability related to the incorrect order of function calls in memory management within the Linux kernel.