CVE-2026-98242None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: dma-buf: Fix silent overflow for phys vec to sgt In case MMIO size is bigger than 4G and peer2peer DMA goes through host bridge, we trigger a code path that assigns th…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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In the Linux kernel, the following vulnerability has been resolved:
dma-buf: Fix silent overflow for phys vec to sgt
In case MMIO size is bigger than 4G and peer2peer DMA goes through host bridge, we trigger a code path that assigns the total linked IOVA (which is greater than 4G) to mapped_len.
Previously, mapped_len was declared as 32-bit unsigned int.
When accumulating size_t lengths, this leads to a silent wrap-around.
This truncation causes truncated lengths to be passed to functions
like fill_sg_entry().
Fix this by changing mapped_len to size_t (64-bit). While
at it, fix similar potential overflow issues in calc_sg_nents
by using check_add_overflow() for nents and using
unsigned int for the loop iterator in fill_sg_entry to match.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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