Vulnerability-Lookup

CVE-2026-74729 (GCVE-0-2026-74729)

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

Title

soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read

Summary

In the Linux kernel, the following vulnerability has been resolved: soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read put_fifo_with_discard() acts as both producer and consumer on the kfifo: it calls kfifo_skip() (advances out) and kfifo_put() (advances in) from the IRQ handler without synchronizing with snoop_file_read(), which also consumes via kfifo_to_user(). On SMP systems this concurrent access can leave (in - out) larger than the ring buffer, so __kfifo_to_user()'s clamp to (in - out) is ineffective and kfifo_copy_to_user() can attempt a copy_to_user() past the kmalloc-2k backing store: usercopy: Kernel memory exposure attempt detected from SLUB object 'kmalloc-2k' (offset 0, size 2049)! kernel BUG at mm/usercopy.c! Call trace: usercopy_abort __check_heap_object __check_object_size kfifo_copy_to_user __kfifo_to_user snoop_file_read vfs_read Serialize kfifo access with a per-channel spinlock shared between the IRQ handler (producer) and the file reader (consumer). Annotate @fifo with __guarded_by(&lock) and opt the driver into context analysis so the compiler enforces that all fifo access holds the lock.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/131ab677b03349a5a…
https://git.kernel.org/stable/c/1acef6d85bfd98bd9…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 3772e5da445420543b25825ac2b5971f3743f6e8 , < 131ab677b03349a5ae48da8722ec7075b37ec66e (git) Affected: 3772e5da445420543b25825ac2b5971f3743f6e8 , < 1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f (git)	guessed
Linux	Linux	Affected: 4.19 Unaffected: 0 , < 4.19 (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/soc/aspeed/Makefile",
            "drivers/soc/aspeed/aspeed-lpc-snoop.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "131ab677b03349a5ae48da8722ec7075b37ec66e",
              "status": "affected",
              "version": "3772e5da445420543b25825ac2b5971f3743f6e8",
              "versionType": "git"
            },
            {
              "lessThan": "1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f",
              "status": "affected",
              "version": "3772e5da445420543b25825ac2b5971f3743f6e8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/soc/aspeed/Makefile",
            "drivers/soc/aspeed/aspeed-lpc-snoop.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "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": "7.1.9",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsoc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read\n\nput_fifo_with_discard() acts as both producer and consumer on the kfifo:\nit calls kfifo_skip() (advances out) and kfifo_put() (advances in) from\nthe IRQ handler without synchronizing with snoop_file_read(), which also\nconsumes via kfifo_to_user(). On SMP systems this concurrent access can\nleave (in - out) larger than the ring buffer, so __kfifo_to_user()\u0027s clamp\nto (in - out) is ineffective and kfifo_copy_to_user() can attempt a\ncopy_to_user() past the kmalloc-2k backing store:\n\n  usercopy: Kernel memory exposure attempt detected from SLUB object\n  \u0027kmalloc-2k\u0027 (offset 0, size 2049)!\n  kernel BUG at mm/usercopy.c!\n  Call trace:\n   usercopy_abort\n   __check_heap_object\n   __check_object_size\n   kfifo_copy_to_user\n   __kfifo_to_user\n   snoop_file_read\n   vfs_read\n\nSerialize kfifo access with a per-channel spinlock shared between the\nIRQ handler (producer) and the file reader (consumer).  Annotate @fifo\nwith __guarded_by(\u0026lock) and opt the driver into context analysis so the\ncompiler enforces that all fifo access holds the lock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:33:19.037Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/131ab677b03349a5ae48da8722ec7075b37ec66e"
        },
        {
          "url": "https://git.kernel.org/stable/c/1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f"
        }
      ],
      "title": "soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74729",
    "datePublished": "2026-08-22T15:33:19.037Z",
    "dateReserved": "2026-08-15T05:44:03.929Z",
    "dateUpdated": "2026-08-22T15:33:19.037Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74729\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:48.033\",\"lastModified\":\"2026-08-22T16:16:48.033\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsoc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read\\n\\nput_fifo_with_discard() acts as both producer and consumer on the kfifo:\\nit calls kfifo_skip() (advances out) and kfifo_put() (advances in) from\\nthe IRQ handler without synchronizing with snoop_file_read(), which also\\nconsumes via kfifo_to_user(). On SMP systems this concurrent access can\\nleave (in - out) larger than the ring buffer, so __kfifo_to_user()\u0027s clamp\\nto (in - out) is ineffective and kfifo_copy_to_user() can attempt a\\ncopy_to_user() past the kmalloc-2k backing store:\\n\\n  usercopy: Kernel memory exposure attempt detected from SLUB object\\n  \u0027kmalloc-2k\u0027 (offset 0, size 2049)!\\n  kernel BUG at mm/usercopy.c!\\n  Call trace:\\n   usercopy_abort\\n   __check_heap_object\\n   __check_object_size\\n   kfifo_copy_to_user\\n   __kfifo_to_user\\n   snoop_file_read\\n   vfs_read\\n\\nSerialize kfifo access with a per-channel spinlock shared between the\\nIRQ handler (producer) and the file reader (consumer).  Annotate @fifo\\nwith __guarded_by(\u0026lock) and opt the driver into context analysis so the\\ncompiler enforces that all fifo access holds the lock.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/soc/aspeed/Makefile\",\"drivers/soc/aspeed/aspeed-lpc-snoop.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3772e5da445420543b25825ac2b5971f3743f6e8\",\"lessThan\":\"131ab677b03349a5ae48da8722ec7075b37ec66e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3772e5da445420543b25825ac2b5971f3743f6e8\",\"lessThan\":\"1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/soc/aspeed/Makefile\",\"drivers/soc/aspeed/aspeed-lpc-snoop.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.19\",\"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\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/131ab677b03349a5ae48da8722ec7075b37ec66e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-74729

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-22 16:16

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/131ab677b03349a5ae48da8722ec7075b37ec66e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/soc/aspeed/Makefile",
            "drivers/soc/aspeed/aspeed-lpc-snoop.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "131ab677b03349a5ae48da8722ec7075b37ec66e",
              "status": "affected",
              "version": "3772e5da445420543b25825ac2b5971f3743f6e8",
              "versionType": "git"
            },
            {
              "lessThan": "1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f",
              "status": "affected",
              "version": "3772e5da445420543b25825ac2b5971f3743f6e8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/soc/aspeed/Makefile",
            "drivers/soc/aspeed/aspeed-lpc-snoop.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "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\nsoc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read\n\nput_fifo_with_discard() acts as both producer and consumer on the kfifo:\nit calls kfifo_skip() (advances out) and kfifo_put() (advances in) from\nthe IRQ handler without synchronizing with snoop_file_read(), which also\nconsumes via kfifo_to_user(). On SMP systems this concurrent access can\nleave (in - out) larger than the ring buffer, so __kfifo_to_user()\u0027s clamp\nto (in - out) is ineffective and kfifo_copy_to_user() can attempt a\ncopy_to_user() past the kmalloc-2k backing store:\n\n  usercopy: Kernel memory exposure attempt detected from SLUB object\n  \u0027kmalloc-2k\u0027 (offset 0, size 2049)!\n  kernel BUG at mm/usercopy.c!\n  Call trace:\n   usercopy_abort\n   __check_heap_object\n   __check_object_size\n   kfifo_copy_to_user\n   __kfifo_to_user\n   snoop_file_read\n   vfs_read\n\nSerialize kfifo access with a per-channel spinlock shared between the\nIRQ handler (producer) and the file reader (consumer).  Annotate @fifo\nwith __guarded_by(\u0026lock) and opt the driver into context analysis so the\ncompiler enforces that all fifo access holds the lock."
    }
  ],
  "id": "CVE-2026-74729",
  "lastModified": "2026-08-22T16:16:48.033",
  "metrics": {},
  "published": "2026-08-22T16:16:48.033",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/131ab677b03349a5ae48da8722ec7075b37ec66e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-6HJ9-W6W6-X26P

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

Details

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

soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read

put_fifo_with_discard() acts as both producer and consumer on the kfifo: it calls kfifo_skip() (advances out) and kfifo_put() (advances in) from the IRQ handler without synchronizing with snoop_file_read(), which also consumes via kfifo_to_user(). On SMP systems this concurrent access can leave (in - out) larger than the ring buffer, so __kfifo_to_user()'s clamp to (in - out) is ineffective and kfifo_copy_to_user() can attempt a copy_to_user() past the kmalloc-2k backing store:

usercopy: Kernel memory exposure attempt detected from SLUB object 'kmalloc-2k' (offset 0, size 2049)! kernel BUG at mm/usercopy.c! Call trace: usercopy_abort __check_heap_object __check_object_size kfifo_copy_to_user __kfifo_to_user snoop_file_read vfs_read

Serialize kfifo access with a per-channel spinlock shared between the IRQ handler (producer) and the file reader (consumer). Annotate @fifo with __guarded_by(&lock) and opt the driver into context analysis so the compiler enforces that all fifo access holds the lock.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-74729"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:48Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsoc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read\n\nput_fifo_with_discard() acts as both producer and consumer on the kfifo:\nit calls kfifo_skip() (advances out) and kfifo_put() (advances in) from\nthe IRQ handler without synchronizing with snoop_file_read(), which also\nconsumes via kfifo_to_user(). On SMP systems this concurrent access can\nleave (in - out) larger than the ring buffer, so __kfifo_to_user()\u0027s clamp\nto (in - out) is ineffective and kfifo_copy_to_user() can attempt a\ncopy_to_user() past the kmalloc-2k backing store:\n\n  usercopy: Kernel memory exposure attempt detected from SLUB object\n  \u0027kmalloc-2k\u0027 (offset 0, size 2049)!\n  kernel BUG at mm/usercopy.c!\n  Call trace:\n   usercopy_abort\n   __check_heap_object\n   __check_object_size\n   kfifo_copy_to_user\n   __kfifo_to_user\n   snoop_file_read\n   vfs_read\n\nSerialize kfifo access with a per-channel spinlock shared between the\nIRQ handler (producer) and the file reader (consumer).  Annotate @fifo\nwith __guarded_by(\u0026lock) and opt the driver into context analysis so the\ncompiler enforces that all fifo access holds the lock.",
  "id": "GHSA-6hj9-w6w6-x26p",
  "modified": "2026-08-22T18:30:30Z",
  "published": "2026-08-22T18:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74729"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/131ab677b03349a5ae48da8722ec7075b37ec66e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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-2026-74729 (GCVE-0-2026-74729)

FKIE_CVE-2026-74729

GHSA-6HJ9-W6W6-X26P

Tags

Sightings

Nomenclature