crypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one

Summary

In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one Sashiko notes: > regarding the bounds check in snp_filter_reserved_mem_regions() > called via walk_iomem_res_desc(): does the check > if ((range_list->num_elements * 16 + 8) > PAGE_SIZE) > allow an off-by-one heap buffer overflow? > > If range_list->num_elements is 255, 255 * 16 + 8 = 4088, which is <= 4096. > Writing range->base (8 bytes) fills 4088-4095, but writing range->page_count > (4 bytes) would write to 4096-4099, overflowing the kzalloc-allocated > PAGE_SIZE buffer. Fix this by accounting for the entry about to be written to, in addition to the entries that are already allocated.

Timeline

1. Aug 15, 2026, 5:59 AM UTCCVE published
2. Oct 16, 2026, 6:55 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 16, 2026, 7:05 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 · fixed in 830c1f3e71989448652973375ef5e39b6ede47a3; From 1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 · fixed in c5c79d92da0f9a09f48be5e2aabed2d6d1a96294; From 1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 · fixed in af7341616b742ad2c374a90998bd650a035f694d; From 1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 · fixed in 1b864b6cb213bbd7b406e9b2e98c962077f300df

• Linux Linux

  6.9

• KernelLinux

  From 6.9.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 4