CVE-2026-74404 crypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one
An off-by-one error in the Linux kernel's CCP driver allows heap buffer overflow, potentially enabling code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74404?
CVE-2026-74404 is a high-severity vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-74404?
How do I fix CVE-2026-74404?
Apply the vendor's patch.
Is CVE-2026-74404 being exploited?
There is no known exploitation of CVE-2026-74404 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74404, DEBIAN-CVE-2026-74404, GHSA-grxx-h4mr-vfpg, UBUNTU-CVE-2026-74404.