Vulnerability-Lookup

CVE-2026-74712 (GCVE-0-2026-74712)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-25 05:41

Title

vdpa/mlx5: Fix buffer length in create_direct_keys()

Summary

In the Linux kernel, the following vulnerability has been resolved: vdpa/mlx5: Fix buffer length in create_direct_keys() We have seen in our CI the following KASAN message: BUG: KASAN: slab-out-of-bounds in cmd_exec+0x550/0xca0 [mlx5_core] Read of size 272 at addr 0000000176795020 by task qemu-system-s39/82764 [...] [<000011388ab3a7a0>] cmd_exec+0x550/0xca0 [mlx5_core] [<000011388ab3b61c>] mlx5_cmd_exec_cb+0x25c/0x4f0 [mlx5_core] [<000011388b21e82e>] mlx5_vdpa_exec_async_cmds+0x22e/0x5e0 [mlx5_vdpa] [<000011388b21fd44>] create_direct_keys+0x954/0xef0 [mlx5_vdpa] [...] The buggy address is located 4128 bytes inside of allocated 4384-byte region [0000000176794000, 0000000176795120) So in essence we read 16 bytes beyond 4384-byte allocation. create_direct_keys calculates the pointer and length for in and out buffers. The size calculation for in includes the entire structure size (out + in + mtt[]) but the pointer passed to cmd_exec points only to the 'in' field, skipping the 'out' field. This causes mlx5_copy_to_msg() to read beyond the allocated buffer by sizeof(out) bytes when copying command data. Properly calculate the input size to match the pointer and allocation size.

Severity

9.3 (Critical)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/ec3bb289cf19d5262…
https://git.kernel.org/stable/c/cde8931a25392670d…
https://git.kernel.org/stable/c/6c8a9f7bc00301e53…
https://git.kernel.org/stable/c/727e1f569855df835…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 0071b138d44af4296bf871e6624369ce697b4b15 , < ec3bb289cf19d526224117d5d450a5fd9cbd5ab2 (git) Affected: 0071b138d44af4296bf871e6624369ce697b4b15 , < cde8931a25392670dd59a0acfcab87a830ab66c5 (git) Affected: 0071b138d44af4296bf871e6624369ce697b4b15 , < 6c8a9f7bc00301e533a5366384f3070a8e7f8430 (git) Affected: 0071b138d44af4296bf871e6624369ce697b4b15 , < 727e1f569855df83579edbd73dcb4a0723543a12 (git)	guessed
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/mlx5/core/mr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ec3bb289cf19d526224117d5d450a5fd9cbd5ab2",
              "status": "affected",
              "version": "0071b138d44af4296bf871e6624369ce697b4b15",
              "versionType": "git"
            },
            {
              "lessThan": "cde8931a25392670dd59a0acfcab87a830ab66c5",
              "status": "affected",
              "version": "0071b138d44af4296bf871e6624369ce697b4b15",
              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/mlx5/core/mr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvdpa/mlx5: Fix buffer length in create_direct_keys()\n\nWe have seen in our CI the following KASAN message:\nBUG: KASAN: slab-out-of-bounds in cmd_exec+0x550/0xca0 [mlx5_core]\nRead of size 272 at addr 0000000176795020 by task qemu-system-s39/82764\n[...]\n[\u003c000011388ab3a7a0\u003e] cmd_exec+0x550/0xca0 [mlx5_core]\n[\u003c000011388ab3b61c\u003e] mlx5_cmd_exec_cb+0x25c/0x4f0 [mlx5_core]\n[\u003c000011388b21e82e\u003e] mlx5_vdpa_exec_async_cmds+0x22e/0x5e0 [mlx5_vdpa]\n[\u003c000011388b21fd44\u003e] create_direct_keys+0x954/0xef0 [mlx5_vdpa]\n[...]\nThe buggy address is located 4128 bytes inside of\nallocated 4384-byte region [0000000176794000, 0000000176795120)\n\nSo in essence we read 16 bytes beyond 4384-byte allocation.\ncreate_direct_keys calculates the pointer and length for in and out\nbuffers.\nThe size calculation for in includes the entire structure\nsize (out + in + mtt[]) but the pointer passed to cmd_exec points only\nto the \u0027in\u0027 field, skipping the \u0027out\u0027 field.\n\nThis causes mlx5_copy_to_msg() to read beyond the allocated buffer\nby sizeof(out) bytes when copying command data.\n\nProperly calculate the input size to match the pointer and allocation size."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached when host vDPA memory keys are created during IOTLB/set_map handling on /dev/vhost-vdpa (ioctl/write from QEMU/vhost), not from remote network packet processing; worst case is a co-tenant VM guest driving host QEMU virtio memory updates on the same mlx5 vDPA host.\nAC:L - Once mlx5 vDPA user MR setup runs, create_direct_keys() always passes an oversized inlen to mlx5_cmd_exec_cb(), deterministically causing mlx5_copy_to_msg() to read past the slab allocation; no race or victim state is required beyond normal virtio memory mapping.\nPR:N - In cloud mlx5 virtio-vDPA deployments a malicious VM tenant needs no host credentials\u2014normal guest virtio-net bring-up causes QEMU to issue vhost IOTLB updates that invoke mlx5_vdpa_set_map() and create_user_mr() on the host without CAP_NET_ADMIN or root in the host init namespace.\nUI:N - Exploitation requires only automated virtio driver initialization and memory table updates; no additional victim clicks, mounts, or manual actions are needed beyond provisioning a vDPA-backed VM, which is the intended operational path.\nS:C - The vulnerable mlx5 vDPA code runs in the hypervisor host kernel while the practical attacker is a guest VM tenant; successful slab out-of-bounds reads and corrupted firmware commands cross the guest/host virtualization boundary per KVM guest-to-host guidance.\nC:H - Incorrect inlen makes mlx5_copy_to_msg() perform a slab out-of-bounds read (KASAN-reported) of adjacent kernel heap memory, copying leaked bytes into CREATE_MKEY commands and enabling arbitrary kernel information disclosure, not a bounded benign leak.\nI:H - The over-read injects adjacent heap contents into firmware CREATE_MKEY command buffers, corrupting memory-key setup data sent to the mlx5 device; this is exploitable kernel memory corruption that can alter device DMA mappings and enable further control, not a read-only crash.\nA:H - The flaw triggers a KASAN slab-out-of-bounds fault in mlx5_core cmd_exec() during normal MR creation; such heap corruption commonly causes kernel oops/panic and can also destabilize vDPA networking on repeated virtio memory remaps."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:41:54.897Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ec3bb289cf19d526224117d5d450a5fd9cbd5ab2"
        },
        {
          "url": "https://git.kernel.org/stable/c/cde8931a25392670dd59a0acfcab87a830ab66c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c8a9f7bc00301e533a5366384f3070a8e7f8430"
        },
        {
          "url": "https://git.kernel.org/stable/c/727e1f569855df83579edbd73dcb4a0723543a12"
        }
      ],
      "title": "vdpa/mlx5: Fix buffer length in create_direct_keys()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74712",
    "datePublished": "2026-08-22T15:33:08.392Z",
    "dateReserved": "2026-08-15T05:44:03.928Z",
    "dateUpdated": "2026-08-25T05:41:54.897Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74712",
      "date": "2026-08-25",
      "epss": "0.00142",
      "percentile": "0.03724"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74712\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:45.957\",\"lastModified\":\"2026-08-25T06:18:56.223\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvdpa/mlx5: Fix buffer length in create_direct_keys()\\n\\nWe have seen in our CI the following KASAN message:\\nBUG: KASAN: slab-out-of-bounds in cmd_exec+0x550/0xca0 [mlx5_core]\\nRead of size 272 at addr 0000000176795020 by task qemu-system-s39/82764\\n[...]\\n[\u003c000011388ab3a7a0\u003e] cmd_exec+0x550/0xca0 [mlx5_core]\\n[\u003c000011388ab3b61c\u003e] mlx5_cmd_exec_cb+0x25c/0x4f0 [mlx5_core]\\n[\u003c000011388b21e82e\u003e] mlx5_vdpa_exec_async_cmds+0x22e/0x5e0 [mlx5_vdpa]\\n[\u003c000011388b21fd44\u003e] create_direct_keys+0x954/0xef0 [mlx5_vdpa]\\n[...]\\nThe buggy address is located 4128 bytes inside of\\nallocated 4384-byte region [0000000176794000, 0000000176795120)\\n\\nSo in essence we read 16 bytes beyond 4384-byte allocation.\\ncreate_direct_keys calculates the pointer and length for in and out\\nbuffers.\\nThe size calculation for in includes the entire structure\\nsize (out + in + mtt[]) but the pointer passed to cmd_exec points only\\nto the \u0027in\u0027 field, skipping the \u0027out\u0027 field.\\n\\nThis causes mlx5_copy_to_msg() to read beyond the allocated buffer\\nby sizeof(out) bytes when copying command data.\\n\\nProperly calculate the input size to match the pointer and allocation size.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/vdpa/mlx5/core/mr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0071b138d44af4296bf871e6624369ce697b4b15\",\"lessThan\":\"ec3bb289cf19d526224117d5d450a5fd9cbd5ab2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0071b138d44af4296bf871e6624369ce697b4b15\",\"lessThan\":\"cde8931a25392670dd59a0acfcab87a830ab66c5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0071b138d44af4296bf871e6624369ce697b4b15\",\"lessThan\":\"6c8a9f7bc00301e533a5366384f3070a8e7f8430\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0071b138d44af4296bf871e6624369ce697b4b15\",\"lessThan\":\"727e1f569855df83579edbd73dcb4a0723543a12\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/vdpa/mlx5/core/mr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":9.3,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6c8a9f7bc00301e533a5366384f3070a8e7f8430\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/727e1f569855df83579edbd73dcb4a0723543a12\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cde8931a25392670dd59a0acfcab87a830ab66c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ec3bb289cf19d526224117d5d450a5fd9cbd5ab2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:55:27+00:00",
      "cve": "CVE-2026-74712",
      "id": "CVE-2026-74712",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vdpa/mlx5: Fix buffer length in create_direct_keys()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74712.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-08-23T00:04:09Z",
      "cve": "CVE-2026-74712",
      "id": "CVE-2026-74712",
      "initial_release_date": "2026-08-23T00:04:09Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74712",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74712.json",
      "version": "2"
    }
  }
}

FKIE_CVE-2026-74712

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-25 06:18

Severity

9.3 (Critical) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6c8a9f7bc00301e533a5366384f3070a8e7f8430
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/727e1f569855df83579edbd73dcb4a0723543a12
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cde8931a25392670dd59a0acfcab87a830ab66c5
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ec3bb289cf19d526224117d5d450a5fd9cbd5ab2

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/mlx5/core/mr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ec3bb289cf19d526224117d5d450a5fd9cbd5ab2",
              "status": "affected",
              "version": "0071b138d44af4296bf871e6624369ce697b4b15",
              "versionType": "git"
            },
            {
              "lessThan": "cde8931a25392670dd59a0acfcab87a830ab66c5",
              "status": "affected",
              "version": "0071b138d44af4296bf871e6624369ce697b4b15",
              "versionType": "git"
            },
            {
              "lessThan": "6c8a9f7bc00301e533a5366384f3070a8e7f8430",
              "status": "affected",
              "version": "0071b138d44af4296bf871e6624369ce697b4b15",
              "versionType": "git"
            },
            {
              "lessThan": "727e1f569855df83579edbd73dcb4a0723543a12",
              "status": "affected",
              "version": "0071b138d44af4296bf871e6624369ce697b4b15",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/mlx5/core/mr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvdpa/mlx5: Fix buffer length in create_direct_keys()\n\nWe have seen in our CI the following KASAN message:\nBUG: KASAN: slab-out-of-bounds in cmd_exec+0x550/0xca0 [mlx5_core]\nRead of size 272 at addr 0000000176795020 by task qemu-system-s39/82764\n[...]\n[\u003c000011388ab3a7a0\u003e] cmd_exec+0x550/0xca0 [mlx5_core]\n[\u003c000011388ab3b61c\u003e] mlx5_cmd_exec_cb+0x25c/0x4f0 [mlx5_core]\n[\u003c000011388b21e82e\u003e] mlx5_vdpa_exec_async_cmds+0x22e/0x5e0 [mlx5_vdpa]\n[\u003c000011388b21fd44\u003e] create_direct_keys+0x954/0xef0 [mlx5_vdpa]\n[...]\nThe buggy address is located 4128 bytes inside of\nallocated 4384-byte region [0000000176794000, 0000000176795120)\n\nSo in essence we read 16 bytes beyond 4384-byte allocation.\ncreate_direct_keys calculates the pointer and length for in and out\nbuffers.\nThe size calculation for in includes the entire structure\nsize (out + in + mtt[]) but the pointer passed to cmd_exec points only\nto the \u0027in\u0027 field, skipping the \u0027out\u0027 field.\n\nThis causes mlx5_copy_to_msg() to read beyond the allocated buffer\nby sizeof(out) bytes when copying command data.\n\nProperly calculate the input size to match the pointer and allocation size."
    }
  ],
  "id": "CVE-2026-74712",
  "lastModified": "2026-08-25T06:18:56.223",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 6.0,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:45.957",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6c8a9f7bc00301e533a5366384f3070a8e7f8430"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/727e1f569855df83579edbd73dcb4a0723543a12"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cde8931a25392670dd59a0acfcab87a830ab66c5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ec3bb289cf19d526224117d5d450a5fd9cbd5ab2"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-8F7V-7FR8-R5C3

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

vdpa/mlx5: Fix buffer length in create_direct_keys()

We have seen in our CI the following KASAN message: BUG: KASAN: slab-out-of-bounds in cmd_exec+0x550/0xca0 [mlx5_core] Read of size 272 at addr 0000000176795020 by task qemu-system-s39/82764 [...] [<000011388ab3a7a0>] cmd_exec+0x550/0xca0 [mlx5_core] [<000011388ab3b61c>] mlx5_cmd_exec_cb+0x25c/0x4f0 [mlx5_core] [<000011388b21e82e>] mlx5_vdpa_exec_async_cmds+0x22e/0x5e0 [mlx5_vdpa] [<000011388b21fd44>] create_direct_keys+0x954/0xef0 [mlx5_vdpa] [...] The buggy address is located 4128 bytes inside of allocated 4384-byte region [0000000176794000, 0000000176795120)

So in essence we read 16 bytes beyond 4384-byte allocation. create_direct_keys calculates the pointer and length for in and out buffers. The size calculation for in includes the entire structure size (out + in + mtt[]) but the pointer passed to cmd_exec points only to the 'in' field, skipping the 'out' field.

This causes mlx5_copy_to_msg() to read beyond the allocated buffer by sizeof(out) bytes when copying command data.

Properly calculate the input size to match the pointer and allocation size.

Severity

9.3 (Critical)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74712"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:45Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvdpa/mlx5: Fix buffer length in create_direct_keys()\n\nWe have seen in our CI the following KASAN message:\nBUG: KASAN: slab-out-of-bounds in cmd_exec+0x550/0xca0 [mlx5_core]\nRead of size 272 at addr 0000000176795020 by task qemu-system-s39/82764\n[...]\n[\u003c000011388ab3a7a0\u003e] cmd_exec+0x550/0xca0 [mlx5_core]\n[\u003c000011388ab3b61c\u003e] mlx5_cmd_exec_cb+0x25c/0x4f0 [mlx5_core]\n[\u003c000011388b21e82e\u003e] mlx5_vdpa_exec_async_cmds+0x22e/0x5e0 [mlx5_vdpa]\n[\u003c000011388b21fd44\u003e] create_direct_keys+0x954/0xef0 [mlx5_vdpa]\n[...]\nThe buggy address is located 4128 bytes inside of\nallocated 4384-byte region [0000000176794000, 0000000176795120)\n\nSo in essence we read 16 bytes beyond 4384-byte allocation.\ncreate_direct_keys calculates the pointer and length for in and out\nbuffers.\nThe size calculation for in includes the entire structure\nsize (out + in + mtt[]) but the pointer passed to cmd_exec points only\nto the \u0027in\u0027 field, skipping the \u0027out\u0027 field.\n\nThis causes mlx5_copy_to_msg() to read beyond the allocated buffer\nby sizeof(out) bytes when copying command data.\n\nProperly calculate the input size to match the pointer and allocation size.",
  "id": "GHSA-8f7v-7fr8-r5c3",
  "modified": "2026-08-25T06:31:29Z",
  "published": "2026-08-22T18:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74712"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c8a9f7bc00301e533a5366384f3070a8e7f8430"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/727e1f569855df83579edbd73dcb4a0723543a12"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cde8931a25392670dd59a0acfcab87a830ab66c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ec3bb289cf19d526224117d5d450a5fd9cbd5ab2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-74712 (GCVE-0-2026-74712)

FKIE_CVE-2026-74712

GHSA-8F7V-7FR8-R5C3

Tags

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Nomenclature