Vulnerability-Lookup

FKIE_CVE-2026-90004

Vulnerability from fkie_nvd - Published: 2026-09-16 11:17 - Updated: 2026-09-16 11:17

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: handle region split failure in apply_min_nr_regions() damon_apply_min_nr_regions() repeatedly split each region until its size becomes small enough to meet the user-defined low limit of the number of regions. The loop assumes the split operation (damon_split_region_at()) will always succeed and create the new region. But the operation could silently fail for memory allocation failures, for example. If such failure happens and the region was the last region, the linked list-based next region fetching returns invalid pointer. As a result, invalid memory dereference and corruption could happen. Even if the corner case is handled, it imposes stress to the allocator by trying split regions for other targets. Fix the issue by breaking all the loops for any region split failure. This means there could be a min_nr_regions violation. It will only rarely happen since the allocation is arguably too small to fail. Even if it happens, it is only temporal. damon_apply_min_nr_regions() will be called again after the aggregation interval. The user impact of the issue should be minor, since the allocation is arguably too small to fail. But, it could still theoretically happen, and the consequence is very bad. This issue was discovered [1] by Sashiko.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/463ebd63e8ee3d73022a18915ea43320dad8aad7
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c608748607620f331196ed0ba9fe4017892c1457

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "463ebd63e8ee3d73022a18915ea43320dad8aad7",
              "status": "affected",
              "version": "b1029f29eb1d5fbf07fa8db9b5e7ab6d9813ad67",
              "versionType": "git"
            },
            {
              "lessThan": "c608748607620f331196ed0ba9fe4017892c1457",
              "status": "affected",
              "version": "b1029f29eb1d5fbf07fa8db9b5e7ab6d9813ad67",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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\nmm/damon/core: handle region split failure in apply_min_nr_regions()\n\ndamon_apply_min_nr_regions() repeatedly split each region until its size\nbecomes small enough to meet the user-defined low limit of the number of\nregions.  The loop assumes the split operation (damon_split_region_at())\nwill always succeed and create the new region.  But the operation could\nsilently fail for memory allocation failures, for example.\n\nIf such failure happens and the region was the last region, the linked\nlist-based next region fetching returns invalid pointer.  As a result,\ninvalid memory dereference and corruption could happen.  Even if the\ncorner case is handled, it imposes stress to the allocator by trying split\nregions for other targets.  Fix the issue by breaking all the loops for\nany region split failure.\n\nThis means there could be a min_nr_regions violation.  It will only rarely\nhappen since the allocation is arguably too small to fail.  Even if it\nhappens, it is only temporal.  damon_apply_min_nr_regions() will be called\nagain after the aggregation interval.\n\nThe user impact of the issue should be minor, since the allocation is\narguably too small to fail.  But, it could still theoretically happen, and\nthe consequence is very bad.\n\nThis issue was discovered [1] by Sashiko."
    }
  ],
  "id": "CVE-2026-90004",
  "lastModified": "2026-09-16T11:17:12.997",
  "metrics": {},
  "published": "2026-09-16T11:17:12.997",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/463ebd63e8ee3d73022a18915ea43320dad8aad7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c608748607620f331196ed0ba9fe4017892c1457"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-90004 (GCVE-0-2026-90004)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:33 – Updated: 2026-09-16 10:33

Title

mm/damon/core: handle region split failure in apply_min_nr_regions()

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/463ebd63e8ee3d730…
https://git.kernel.org/stable/c/c608748607620f331…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b1029f29eb1d5fbf07fa8db9b5e7ab6d9813ad67 , < 463ebd63e8ee3d73022a18915ea43320dad8aad7 (git) Affected: b1029f29eb1d5fbf07fa8db9b5e7ab6d9813ad67 , < c608748607620f331196ed0ba9fe4017892c1457 (git)
Linux	Linux	Affected: 7.1 Unaffected: 0 , < 7.1 (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "463ebd63e8ee3d73022a18915ea43320dad8aad7",
              "status": "affected",
              "version": "b1029f29eb1d5fbf07fa8db9b5e7ab6d9813ad67",
              "versionType": "git"
            },
            {
              "lessThan": "c608748607620f331196ed0ba9fe4017892c1457",
              "status": "affected",
              "version": "b1029f29eb1d5fbf07fa8db9b5e7ab6d9813ad67",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: handle region split failure in apply_min_nr_regions()\n\ndamon_apply_min_nr_regions() repeatedly split each region until its size\nbecomes small enough to meet the user-defined low limit of the number of\nregions.  The loop assumes the split operation (damon_split_region_at())\nwill always succeed and create the new region.  But the operation could\nsilently fail for memory allocation failures, for example.\n\nIf such failure happens and the region was the last region, the linked\nlist-based next region fetching returns invalid pointer.  As a result,\ninvalid memory dereference and corruption could happen.  Even if the\ncorner case is handled, it imposes stress to the allocator by trying split\nregions for other targets.  Fix the issue by breaking all the loops for\nany region split failure.\n\nThis means there could be a min_nr_regions violation.  It will only rarely\nhappen since the allocation is arguably too small to fail.  Even if it\nhappens, it is only temporal.  damon_apply_min_nr_regions() will be called\nagain after the aggregation interval.\n\nThe user impact of the issue should be minor, since the allocation is\narguably too small to fail.  But, it could still theoretically happen, and\nthe consequence is very bad.\n\nThis issue was discovered [1] by Sashiko."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T10:33:14.085Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/463ebd63e8ee3d73022a18915ea43320dad8aad7"
        },
        {
          "url": "https://git.kernel.org/stable/c/c608748607620f331196ed0ba9fe4017892c1457"
        }
      ],
      "title": "mm/damon/core: handle region split failure in apply_min_nr_regions()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90004",
    "datePublished": "2026-09-16T10:33:14.085Z",
    "dateReserved": "2026-09-11T19:38:34.780Z",
    "dateUpdated": "2026-09-16T10:33:14.085Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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