Bug 2348886 (CVE-2025-21800)

Summary: CVE-2025-21800 kernel: net/mlx5: HWS, fix definer's HWS_SET32 macro for negative offset
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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OS: Linux   
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Description OSIDB Bzimport 2025-02-27 21:01:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net/mlx5: HWS, fix definer's HWS_SET32 macro for negative offset

When bit offset for HWS_SET32 macro is negative,
UBSAN complains about the shift-out-of-bounds:

  UBSAN: shift-out-of-bounds in
  drivers/net/ethernet/mellanox/mlx5/core/steering/hws/definer.c:177:2
  shift exponent -8 is negative
Comment 1 Avinash Hanwate 2025-02-28 06:42:30 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022752-CVE-2025-21800-d1e6@gregkh/T