Bug 2482173 (CVE-2026-46070)

Summary: CVE-2026-46070 kernel: md/raid5: validate payload size before accessing journal metadata
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: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's md/raid5 component. This vulnerability arises from insufficient validation of payload sizes within journal metadata blocks. A local attacker can exploit this by providing a corrupted journal, leading to out-of-bounds reads when the system processes payload fields or computes offsets. This could result in information disclosure or system instability.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-05-27 15:14:46 UTC 
In the Linux kernel, the following vulnerability has been resolved:

md/raid5: validate payload size before accessing journal metadata

r5c_recovery_analyze_meta_block() and
r5l_recovery_verify_data_checksum_for_mb() iterate over payloads in a
journal metadata block using on-disk payload size fields without
validating them against the remaining space in the metadata block.

A corrupted journal contains payload sizes extending beyond the PAGE_SIZE
boundary can cause out-of-bounds reads when accessing payload fields or
computing offsets.

Add bounds validation for each payload type to ensure the full payload
fits within meta_size before processing.
Comment 1 Keith Grant 2026-05-27 17:52:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052758-CVE-2026-46070-1876@gregkh/T