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CVE-2026-74404 (GCVE-0-2026-74404)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:46
VLAI
Title
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 , < 830c1f3e71989448652973375ef5e39b6ede47a3 (git)
Affected: 1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 , < c5c79d92da0f9a09f48be5e2aabed2d6d1a96294 (git)
Affected: 1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 , < af7341616b742ad2c374a90998bd650a035f694d (git)
Affected: 1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 , < 1b864b6cb213bbd7b406e9b2e98c962077f300df (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "drivers/crypto/ccp/sev-dev.c"
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          "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\u003e regarding the bounds check in snp_filter_reserved_mem_regions()\n\u003e called via walk_iomem_res_desc(): does the check\n\u003e if ((range_list-\u003enum_elements * 16 + 8) \u003e PAGE_SIZE)\n\u003e allow an off-by-one heap buffer overflow?\n\u003e\n\u003e If range_list-\u003enum_elements is 255, 255 * 16 + 8 = 4088, which is \u003c= 4096.\n\u003e Writing range-\u003ebase (8 bytes) fills 4088-4095, but writing range-\u003epage_count\n\u003e (4 bytes) would write to 4096-4099, overflowing the kzalloc-allocated\n\u003e 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."
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              "value": "AV:L - The overflow is reached only via local host paths\u2014KVM VM ioctl KVM_SEV_INIT2 (sev_guest_init2\u2192sev_platform_init\u2192__sev_snp_init_locked) or kernel boot-time SEV-SNP platform init\u2014not through any network, Bluetooth, or physical bus handler.\nAC:L - Once on an AMD SEV-SNP host with SNP firmware \u22651.52, 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 \u2265256 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."
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    "dateReserved": "2026-08-15T05:44:03.892Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T22:17:44+00:00",
      "cve": "CVE-2026-74404",
      "id": "CVE-2026-74404",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74404.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.