Bug 2348902 (CVE-2025-21815)

Summary: CVE-2025-21815 kernel: mm/compaction: fix UBSAN shift-out-of-bounds warning
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the memory management subsystem in the Linux kernel. An integer overflow in a shift operation can cause unexpected behavior in memory management, resulting in system instability and a denial of service.
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Description OSIDB Bzimport 2025-02-27 21:02:35 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm/compaction: fix UBSAN shift-out-of-bounds warning

syzkaller reported a UBSAN shift-out-of-bounds warning of (1UL << order)
in isolate_freepages_block().  The bogus compound_order can be any value
because it is union with flags.  Add back the MAX_PAGE_ORDER check to fix
the warning.
Comment 1 Avinash Hanwate 2025-02-28 05:24:52 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022709-CVE-2025-21815-19c9@gregkh/T