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Mallory
High

Linux kernel netfilter ipset bitmap_ip_uadt missing range check

IdentifiersCVE-2024-53141CWE-20

CVE-2024-53141 is a Linux kernel flaw in netfilter ipset, specifically in the bitmap_ip_uadt path. According to the provided description, when IPSET_ATTR_IP_TO is absent but IPSET_ATTR_CIDR is present, the handling of ip and ip_to becomes slightly swapped. As a result, the expected validation of the ip value is performed at the wrong point, leaving a required range check missing. The upstream fix adds the missing range validation and removes checks that were unnecessary in the affected logic. This is an input-validation error in kernel networking code that processes ipset bitmap IP update/add/test operations.

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ANALYST BRIEF

Impact, mitigation & remediation

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Impact

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A missing range check in kernel-space netfilter/ipset code can allow malformed or unexpected input to reach code paths that assume validated address bounds. Based on the provided context, this can lead to security impact in the Linux kernel and has been associated in mention context with possible privilege-escalation discussion, but the precise exploitation outcome is not explicitly stated in the supplied content. The confirmed impact from the provided description is that improper validation in kernel networking code creates a vulnerability condition in the kernel.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure by restricting or disabling use of the affected ipset functionality where operationally feasible, especially workflows that allow untrusted or less-trusted actors to create or modify ipset entries through netfilter-related interfaces. Limit access to privileged network administration capabilities and kernel attack surface until patched. Specific mitigations beyond patching are not provided in the supplied content.

Remediation

Patch, then assume compromise.

Apply the Linux kernel update containing the netfilter ipset fix for CVE-2024-53141. The fix adds the missing range check in bitmap_ip_uadt for the case where IPSET_ATTR_IP_TO is not supplied and IPSET_ATTR_CIDR is present, and removes unnecessary checks. Use the vendor-supported patched kernel version for the affected distribution.
PUBLIC EXPLOITS

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VALID 0 / 0 TOTALView more in app

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EXPOSURE SURFACE

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LinuxLinux Kerneloperating_system

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Social activity8

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