Bug 2355459 (CVE-2023-53032)

Summary: CVE-2023-53032 kernel: netfilter: ipset: Fix overflow before widen in the bitmap_ip_create() function.
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-03-27 17:02:35 UTC 
In the Linux kernel, the following vulnerability has been resolved:

netfilter: ipset: Fix overflow before widen in the bitmap_ip_create() function.

When first_ip is 0, last_ip is 0xFFFFFFFF, and netmask is 31, the value of
an arithmetic expression 2 << (netmask - mask_bits - 1) is subject
to overflow due to a failure casting operands to a larger data type
before performing the arithmetic.

Note that it's harmless since the value will be checked at the next step.

Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.
Comment 1 Robb Gatica 2025-03-27 23:58:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025032721-CVE-2023-53032-70ce@gregkh/T