Bug 2516553 (CVE-2026-72414)

Summary: CVE-2026-72414 kernel: net: dsa: sja1105: round up PTP perout pin duration
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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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 `net: dsa: sja1105` component. This vulnerability occurs when processing specific timing parameters, where very small user-provided values are converted to zero. This incorrect conversion can lead to a division-by-zero error in the `future_base_time()` function, which may result in a system crash and a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-08-15 06:18:40 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: dsa: sja1105: round up PTP perout pin duration

pin_duration is converted from the user-provided period to SJA1105
clock ticks and is later passed as the cycle_time argument to
future_base_time().

Very small period values may become zero after the conversion,
which can lead to a division by zero in future_base_time().

Round zero pin_duration up to 1 tick so that the smallest unsupported
periods use the minimum non-zero hardware duration instead of passing
zero to future_base_time().
Comment 1 Keith Grant 2026-08-19 15:58:29 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081524-CVE-2026-72414-4bc2@gregkh/T