Vulnerability-Lookup

FKIE_CVE-2026-74643

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

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: samples/damon/mtier: error out for zero quota goal target values Patch series "mm/damon: avoid division by zero from damos_quota_score()". DAMON_SAMPLE_MTIER and DAMON_LRU_SORT allow the user to trigger division by zero in damos_quota_score(). Avoid it by adding parameters validation checks. This patch (of 2): damos_quota_score() can trigger division by zero if the target_value is zero. DAMON_SAMPLE_MTIER lets users set the target_value via node0_mem_{used,free}_bp parameters. It doesn't guard zero value case, though. As a result, users can trigger division by zero. Fix the issue by returning an error when the user tries to start DAMON with zero node0_mem_{used,free}_bp parameter values. DAMON_SAMPLE_MTIER is just a sample module, but the consequence is quite bad. Also the zero node0_mem_free_bp parameter might look like a reasonable setup to some users. Hence, the issue might really happen in the real world. One reliable way to reproduce the issue is like below: # cd /sys/module/damon_sample_mtier/parameters # echo 4096 > node0_start_addr # echo 8192 > node0_end_addr # echo 8192 > node1_start_addr # echo 81920 > node1_end_addr # echo 0 > node0_mem_free_bp # echo Y > enabled # dmesg -w [...] [18792.235916] Oops: divide error: 0000 [#1] SMP NOPTI [...] [18792.242787] RIP: 0010:damos_quota_score+0x6f/0x480 [...] This issue was discovered [1] by Sashiko.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/684f271210becd7b8c4088f06c442499e48a43a0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a16fd3ad9d89b05475864da97327870464611736
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e16b8d640ec99b28bc827560edcf9706e610c3aa

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "samples/damon/mtier.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e16b8d640ec99b28bc827560edcf9706e610c3aa",
              "status": "affected",
              "version": "c5e67d40a10234541e220750297304df79aaedd0",
              "versionType": "git"
            },
            {
              "lessThan": "684f271210becd7b8c4088f06c442499e48a43a0",
              "status": "affected",
              "version": "c5e67d40a10234541e220750297304df79aaedd0",
              "versionType": "git"
            },
            {
              "lessThan": "a16fd3ad9d89b05475864da97327870464611736",
              "status": "affected",
              "version": "c5e67d40a10234541e220750297304df79aaedd0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "samples/damon/mtier.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "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\nsamples/damon/mtier: error out for zero quota goal target values\n\nPatch series \"mm/damon: avoid division by zero from damos_quota_score()\".\n\nDAMON_SAMPLE_MTIER and DAMON_LRU_SORT allow the user to trigger division\nby zero in damos_quota_score().  Avoid it by adding parameters validation\nchecks.\n\n\nThis patch (of 2):\n\ndamos_quota_score() can trigger division by zero if the target_value is\nzero.  DAMON_SAMPLE_MTIER lets users set the target_value via\nnode0_mem_{used,free}_bp parameters.  It doesn\u0027t guard zero value case,\nthough.  As a result, users can trigger division by zero.  Fix the issue\nby returning an error when the user tries to start DAMON with zero\nnode0_mem_{used,free}_bp parameter values.\n\nDAMON_SAMPLE_MTIER is just a sample module, but the consequence is quite\nbad.  Also the zero node0_mem_free_bp parameter might look like a\nreasonable setup to some users.  Hence, the issue might really happen in\nthe real world.\n\nOne reliable way to reproduce the issue is like below:\n\n    # cd /sys/module/damon_sample_mtier/parameters\n    # echo 4096 \u003e node0_start_addr\n    # echo 8192 \u003e node0_end_addr\n    # echo 8192 \u003e node1_start_addr\n    # echo 81920 \u003e node1_end_addr\n    # echo 0 \u003e node0_mem_free_bp\n    # echo Y \u003e enabled\n    # dmesg -w\n    [...]\n    [18792.235916] Oops: divide error: 0000 [#1] SMP NOPTI\n    [...]\n    [18792.242787] RIP: 0010:damos_quota_score+0x6f/0x480\n    [...]\n\nThis issue was discovered [1] by Sashiko."
    }
  ],
  "id": "CVE-2026-74643",
  "lastModified": "2026-08-22T16:16:37.617",
  "metrics": {},
  "published": "2026-08-22T16:16:37.617",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/684f271210becd7b8c4088f06c442499e48a43a0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a16fd3ad9d89b05475864da97327870464611736"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e16b8d640ec99b28bc827560edcf9706e610c3aa"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-74643 (GCVE-0-2026-74643)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-22 15:32

Title

samples/damon/mtier: error out for zero quota goal target values

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/e16b8d640ec99b28b…
https://git.kernel.org/stable/c/684f271210becd7b8…
https://git.kernel.org/stable/c/a16fd3ad9d89b0547…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c5e67d40a10234541e220750297304df79aaedd0 , < e16b8d640ec99b28bc827560edcf9706e610c3aa (git) Affected: c5e67d40a10234541e220750297304df79aaedd0 , < 684f271210becd7b8c4088f06c442499e48a43a0 (git) Affected: c5e67d40a10234541e220750297304df79aaedd0 , < a16fd3ad9d89b05475864da97327870464611736 (git)
Linux	Linux	Affected: 6.17 Unaffected: 0 , < 6.17 (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "samples/damon/mtier.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e16b8d640ec99b28bc827560edcf9706e610c3aa",
              "status": "affected",
              "version": "c5e67d40a10234541e220750297304df79aaedd0",
              "versionType": "git"
            },
            {
              "lessThan": "684f271210becd7b8c4088f06c442499e48a43a0",
              "status": "affected",
              "version": "c5e67d40a10234541e220750297304df79aaedd0",
              "versionType": "git"
            },
            {
              "lessThan": "a16fd3ad9d89b05475864da97327870464611736",
              "status": "affected",
              "version": "c5e67d40a10234541e220750297304df79aaedd0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "samples/damon/mtier.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "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": "6.18.45",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsamples/damon/mtier: error out for zero quota goal target values\n\nPatch series \"mm/damon: avoid division by zero from damos_quota_score()\".\n\nDAMON_SAMPLE_MTIER and DAMON_LRU_SORT allow the user to trigger division\nby zero in damos_quota_score().  Avoid it by adding parameters validation\nchecks.\n\n\nThis patch (of 2):\n\ndamos_quota_score() can trigger division by zero if the target_value is\nzero.  DAMON_SAMPLE_MTIER lets users set the target_value via\nnode0_mem_{used,free}_bp parameters.  It doesn\u0027t guard zero value case,\nthough.  As a result, users can trigger division by zero.  Fix the issue\nby returning an error when the user tries to start DAMON with zero\nnode0_mem_{used,free}_bp parameter values.\n\nDAMON_SAMPLE_MTIER is just a sample module, but the consequence is quite\nbad.  Also the zero node0_mem_free_bp parameter might look like a\nreasonable setup to some users.  Hence, the issue might really happen in\nthe real world.\n\nOne reliable way to reproduce the issue is like below:\n\n    # cd /sys/module/damon_sample_mtier/parameters\n    # echo 4096 \u003e node0_start_addr\n    # echo 8192 \u003e node0_end_addr\n    # echo 8192 \u003e node1_start_addr\n    # echo 81920 \u003e node1_end_addr\n    # echo 0 \u003e node0_mem_free_bp\n    # echo Y \u003e enabled\n    # dmesg -w\n    [...]\n    [18792.235916] Oops: divide error: 0000 [#1] SMP NOPTI\n    [...]\n    [18792.242787] RIP: 0010:damos_quota_score+0x6f/0x480\n    [...]\n\nThis issue was discovered [1] by Sashiko."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:32:21.140Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e16b8d640ec99b28bc827560edcf9706e610c3aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/684f271210becd7b8c4088f06c442499e48a43a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/a16fd3ad9d89b05475864da97327870464611736"
        }
      ],
      "title": "samples/damon/mtier: error out for zero quota goal target values",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74643",
    "datePublished": "2026-08-22T15:32:21.140Z",
    "dateReserved": "2026-08-15T05:44:03.922Z",
    "dateUpdated": "2026-08-22T15:32:21.140Z",
    "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.

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FKIE_CVE-2026-74643

CVE-2026-74643 (GCVE-0-2026-74643)

Tags

Sightings

Nomenclature