{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74404","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.892Z","datePublished":"2026-08-15T05:59:14.073Z","dateUpdated":"2026-08-17T05:46:46.485Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:46:46.485Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one\n\nSashiko notes:\n\n> regarding the bounds check in snp_filter_reserved_mem_regions()\n> called via walk_iomem_res_desc(): does the check\n> if ((range_list->num_elements * 16 + 8) > PAGE_SIZE)\n> allow an off-by-one heap buffer overflow?\n>\n> If range_list->num_elements is 255, 255 * 16 + 8 = 4088, which is <= 4096.\n> Writing range->base (8 bytes) fills 4088-4095, but writing range->page_count\n> (4 bytes) would write to 4096-4099, overflowing the kzalloc-allocated\n> PAGE_SIZE buffer.\n\nFix this by accounting for the entry about to be written to, in addition to\nthe entries that are already allocated."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The overflow is reached only via local host paths—KVM VM ioctl KVM_SEV_INIT2 (sev_guest_init2→sev_platform_init→__sev_snp_init_locked) or kernel boot-time SEV-SNP platform init—not through any network, Bluetooth, or physical bus handler.\nAC:L - Once on an AMD SEV-SNP host with SNP firmware ≥1.52, a caller can deterministically trigger SNP_INIT_EX initialization via KVM_SEV_INIT2; no race or attacker-uncontrollable timing is required, only a firmware memory map with ≥256 matching reserved/ACPI/PMEM iomem regions.\nPR:L - Exploitation requires local hypervisor access to create an SNP-capable KVM VM and issue KVM_SEV_INIT2 (typical /dev/kvm or kvm-group hypervisor operator), not unauthenticated remote access; comparable KVM ioctl CVEs in this repo score this as low privilege rather than init-namespace root only.\nUI:N - No victim interaction is needed beyond the attacker (or boot sequence) invoking SNP platform initialization; the bug fires automatically while enumerating the system iomem map during SNP_INIT_EX setup.\nS:U - The corruption occurs in host kernel heap memory during hypervisor SEV-SNP platform initialization by a host-side caller; it is not a guest-to-host VM escape, IOMMU/DMA bypass, or cross-authority sandbox breakout.\nC:H - The off-by-one permits a 4-byte out-of-bounds write of page_count past a PAGE_SIZE kzalloc buffer, corrupting adjacent kmalloc slab memory in ways that can be leveraged for kernel information disclosure.\nI:H - A controlled heap buffer overflow (even 4 bytes) can corrupt adjacent kernel objects and be developed into arbitrary kernel memory writes or control-flow hijacking, satisfying high integrity impact per kernel OOB-write guidance.\nA:H - Heap metadata/object corruption during SNP_INIT_EX can cause kernel oops/panic or leave the host in a failed state, especially on confidential-computing servers where SNP initialization is on the critical boot/VM-launch path."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/ccp/sev-dev.c"],"versions":[{"version":"1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2","lessThan":"830c1f3e71989448652973375ef5e39b6ede47a3","status":"affected","versionType":"git"},{"version":"1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2","lessThan":"c5c79d92da0f9a09f48be5e2aabed2d6d1a96294","status":"affected","versionType":"git"},{"version":"1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2","lessThan":"af7341616b742ad2c374a90998bd650a035f694d","status":"affected","versionType":"git"},{"version":"1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2","lessThan":"1b864b6cb213bbd7b406e9b2e98c962077f300df","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/ccp/sev-dev.c"],"versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/830c1f3e71989448652973375ef5e39b6ede47a3"},{"url":"https://git.kernel.org/stable/c/c5c79d92da0f9a09f48be5e2aabed2d6d1a96294"},{"url":"https://git.kernel.org/stable/c/af7341616b742ad2c374a90998bd650a035f694d"},{"url":"https://git.kernel.org/stable/c/1b864b6cb213bbd7b406e9b2e98c962077f300df"}],"title":"crypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one","x_generator":{"engine":"bippy-1.2.0"}}}}