Bug 2516371 (CVE-2026-68474)

Summary: CVE-2026-68474 kernel: powerpc/spufs: fix out-of-bounds access in spufs_mem_mmap_access()
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, specifically within the powerpc/spufs component responsible for managing memory access. This vulnerability allows for an out-of-bounds memory access due to incorrect boundary checks in the `spufs_mem_mmap_access()` function. An attacker could exploit this to corrupt memory, potentially leading to system instability (denial of service) or unauthorized privilege escalation.
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Description OSIDB Bzimport 2026-08-15 06:09:02 UTC 
In the Linux kernel, the following vulnerability has been resolved:

powerpc/spufs: fix out-of-bounds access in spufs_mem_mmap_access()

spufs_mem_mmap_access() computes the local store offset as
address - vma->vm_start, but bounds-checks it against vma->vm_end
instead of the local store size. On 64-bit, offset is always well
below vma->vm_end, so the clamp never fires and len stays unbounded
against the LS_SIZE buffer returned by ctx->ops->get_ls().

Reject offsets at or beyond LS_SIZE and clamp len to the remaining
space, mirroring the guard already used by spufs_mem_mmap_fault() and
spufs_ps_fault().
Comment 1 Keith Grant 2026-08-17 14:30:47 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081505-CVE-2026-68474-f8a6@gregkh/T