CVE-2026-99240

mm/damon/core: error damos_commit_quota_goal() for zero target_value

Products / packages Linux

Published 02/11/2026, 16:06:43 UTC

Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 06/11/2026, 21:10:31 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

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

Source excerpt · Linux

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

4 ranges

Linux version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

c5e67d40a10234541e220750297304df79aaedd0 → before d5482be6243b816730689099c017109eb8730dd5

git versions

c5e67d40a10234541e220750297304df79aaedd0 → before cc190c4073f570fd78a9d00dd3d13a71eced5403

git versions

c5e67d40a10234541e220750297304df79aaedd0 → before 156aeda4d74e9007b56492ed1f3b5838822632be

git versions

c5e67d40a10234541e220750297304df79aaedd0 → before 610c4438fb66e06d9e693c0ad3b2c1be54c0d61f

git versions

Other versions: unaffected

Linux · Linux

Linux

6 ranges

Linux version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

6.17

unaffected

0 → before 6.17

semver versions

6.18.60 → through 6.18.*

semver versions

7.2.14 → through 7.2.*

semver versions

7.3.1 → through 7.3.*

semver versions

7.4-rc1 → through *

original_commit_for_fix versions

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

Update it to return an error in the case.

Linux guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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

mm/damon/core: error damos_commit_quota_goal() for zero target_value

Patch series "mm/damon: move zero damos quota target_value handling to the core layer".

Having zero DAMOS quota target value can cause division by zero. DAMON API callers are checking the target value parameters to avoid that. It is easy to make mistakes in some of the multiple API callers. Move that to the core layer.

Patch 1 adds the corner case handling into the core layer DAMON parameters validation logic. Patches 2 and 3 remove no more needed DAMON API callers side handling of the corner case in DAMON_LRU_SORT and DMON_SAMPLIE_MTIER, respectively.

This patch (of 3):

If a DAMOS scheme has a damos_quota_goal of zero target_value, damos_quota_goal() could trigger division-by-zero error. Hence each DAMON API callers should do the zero target_value validation. It is easy to make mistakes. Actually such bugs in DAMON_LRU_SORT and DAMON_SAMPLE_MTIER were found and fixed [1].

It is better to handle the corner case only once in the core layer, instead of multiple places in all DAMON API callers. One straightforward option is using an alternative denominator for the corner case in the damos_quota_goal(). However, the zero target_value is meaningless. In this case, the quota goal is always evaluated as achieved or over-achieved. The quota will only keep being reduced.

Simply avoid using zero target_value by adding a check in the core layer DAMOS quota goal parameters validation/commit path, damos_commit_quota_goal(). Update it to return an error in the case. Also update its caller to propagate the error.

References

4 sources

git.kernel.org/stable/c/d5482be6243b816730689099c017109eb8730dd5

Source referenceLinux

git.kernel.org/stable/c/cc190c4073f570fd78a9d00dd3d13a71eced5403

Source referenceLinux

git.kernel.org/stable/c/156aeda4d74e9007b56492ed1f3b5838822632be

Source referenceLinux

git.kernel.org/stable/c/610c4438fb66e06d9e693c0ad3b2c1be54c0d61f

Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied

Version evidence

Remediation guidance · not supplied

Weakness classification · not supplied

Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-99240

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.17

After:

Through (inclusive):

Before: 6.18.60

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.17

After:

Through (inclusive):

Before: 7.2.14

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.17

After:

Through (inclusive):

Before: 7.3.1

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.17

After:

Through (inclusive):

Before: 7.4-rc1

Original applicability statements

[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.17",
            "versionEndExcluding": "6.18.60"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.17",
            "versionEndExcluding": "7.2.14"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.17",
            "versionEndExcluding": "7.3.1"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.17",
            "versionEndExcluding": "7.4-rc1"
          }
        ]
      }
    ]
  }
]

Contributing organizations · 1

Linux

Assigning organization

2026-11-03

Timeline

All times UTC

2 Nov 2026, 16:06
Advisory published
Publication date supplied by the source.
3 Nov 2026, 19:13
Source updated
Latest modification date supplied by the source.
3 Nov 2026, 19:29
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

CVE · CVE-2026-992402026-11-03

Observed 2026-11-03T19:29:01.181Z · upstream updated 2026-11-03T19:13:07.661Z

Product or version evidence changed

before

[
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
        "status": "affected",
        "lessThan": "d5482be6243b816730689099c017109eb8730dd5",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
        "status": "affected",
        "lessThan": "cc190c4073f570fd78a9d00dd3d13a71eced5403",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
        "status": "affected",
        "lessThan": "156aeda4d74e9007b56492ed1f3b5838822632be",
        "versionType": "git"
      },
      {
        "version": "0",
        "status": "affected",
        "lessThan": "6.18.60",
        "versionType": "semver"
      },
      {
        "version": "0",
        "status": "affected",
        "lessThan": "7.2.14",
        "versionType": "semver"
      },
      {
        "version": "0",
        "status": "affected",
        "lessThan": "7.3.1",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99240"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "6.18.60",
        "status": "unaffected",
        "lessThanOrEqual": "6.18.*",
        "versionType": "semver"
      },
      {
        "version": "7.2.14",
        "status": "unaffected",
        "lessThanOrEqual": "7.2.*",
        "versionType": "semver"
      },
      {
        "version": "7.3.1",
        "status": "unaffected",
        "lessThanOrEqual": "7.3.*",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99240"
  }
]

after

[
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "c5e67d40a10234541e220750297304df79aaedd0",
        "status": "affected",
        "lessThan": "d5482be6243b816730689099c017109eb8730dd5",
        "versionType": "git"
      },
      {
        "version": "c5e67d40a10234541e220750297304df79aaedd0",
        "status": "affected",
        "lessThan": "cc190c4073f570fd78a9d00dd3d13a71eced5403",
        "versionType": "git"
      },
      {
        "version": "c5e67d40a10234541e220750297304df79aaedd0",
        "status": "affected",
        "lessThan": "156aeda4d74e9007b56492ed1f3b5838822632be",
        "versionType": "git"
      },
      {
        "version": "c5e67d40a10234541e220750297304df79aaedd0",
        "status": "affected",
        "lessThan": "610c4438fb66e06d9e693c0ad3b2c1be54c0d61f",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99240"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "6.17",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "6.17",
        "versionType": "semver"
      },
      {
        "version": "6.18.60",
        "status": "unaffected",
        "lessThanOrEqual": "6.18.*",
        "versionType": "semver"
      },
      {
        "version": "7.2.14",
        "status": "unaffected",
        "lessThanOrEqual": "7.2.*",
        "versionType": "semver"
      },
      {
        "version": "7.3.1",
        "status": "unaffected",
        "lessThanOrEqual": "7.3.*",
        "versionType": "semver"
      },
      {
        "version": "7.4-rc1",
        "status": "unaffected",
        "lessThanOrEqual": "*",
        "versionType": "original_commit_for_fix"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99240"
  }
]

References changed

before

[
  "https://git.kernel.org/stable/c/d5482be6243b816730689099c017109eb8730dd5",
  "https://git.kernel.org/stable/c/cc190c4073f570fd78a9d00dd3d13a71eced5403",
  "https://git.kernel.org/stable/c/156aeda4d74e9007b56492ed1f3b5838822632be"
]

after

[
  "https://git.kernel.org/stable/c/d5482be6243b816730689099c017109eb8730dd5",
  "https://git.kernel.org/stable/c/cc190c4073f570fd78a9d00dd3d13a71eced5403",
  "https://git.kernel.org/stable/c/156aeda4d74e9007b56492ed1f3b5838822632be",
  "https://git.kernel.org/stable/c/610c4438fb66e06d9e693c0ad3b2c1be54c0d61f"
]

Environment requirements changed

before

[
  {
    "source": "Linux",
    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
            "cpeMatch": [
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionEndExcluding": "6.18.60"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionEndExcluding": "7.2.14"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionEndExcluding": "7.3.1"
              }
            ]
          }
        ]
      }
    ]
  }
]

after

[
  {
    "source": "Linux",
    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
            "cpeMatch": [
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "6.17",
                "versionEndExcluding": "6.18.60"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "6.17",
                "versionEndExcluding": "7.2.14"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "6.17",
                "versionEndExcluding": "7.3.1"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "6.17",
                "versionEndExcluding": "7.4-rc1"
              }
            ]
          }
        ]
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. No numeric assessment supplied.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

Record identifiers

Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-99240

Enrichment coverage

NVDAvailable

Checked 02/11/2026, 16:20:38 UTC

GHSANo result

Checked 02/11/2026, 16:20:38 UTC

EUVDNo result

Checked 02/11/2026, 16:20:38 UTC

EPSSNo result

Checked 02/11/2026, 16:20:38 UTC

Additional source evidence

NVD · CVE-2026-99240Checked 02/11/2026, 16:20:38 UTC

Sponsored by MoxsoBuild security habits with adaptive training and phishing simulations.View as JSON

mm/damon/core: error damos_commit_quota_goal() for zero target_value

Severity and exploitation

What this means

Attack conditions

Affected versions

Linux

affected

unaffected

unknown

Linux

affected

unaffected

unknown

What to do

Public exploit evidence

Original source description

References

Inside the record

Evidence available

Original records

Environment requirements

Timeline

Advisory published

Source updated

Last imported by cve.new

What changed