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NVD / CVE Program· CNA Linux

CVE-2026-99240: mm/damon/core: error damos_commit_quota_goal() for zero target_value

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.15% (FIRST EPSS).
  • Fixed version: Linux Linux 156aeda4d74e9007b56492ed1f3b5838822632be, 610c4438fb66e06d9e693c0ad3b2c1be54c0d61f, cc190c4073f570fd78a9d00dd3d13a71eced5403.

Low priority for now. Upgrade to Linux Linux 156aeda4d74e9007b56492ed1f3b5838822632be, 610c4438fb66e06d9e693c0ad3b2c1be54c0d61f, cc190c4073f570fd78a9d00dd3d13a71eced5403 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Nov 2, 2026
Updated
Nov 3, 2026
EPSS
0.1% · 4th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

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—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.17affected
    • c5e67d40a10234541e220750297304df79aaedd0 and later · before d5482be6243b816730689099c017109eb8730dd5affected · git
    • c5e67d40a10234541e220750297304df79aaedd0 and later · before cc190c4073f570fd78a9d00dd3d13a71eced5403affected · git
    • c5e67d40a10234541e220750297304df79aaedd0 and later · before 156aeda4d74e9007b56492ed1f3b5838822632beaffected · git
    • c5e67d40a10234541e220750297304df79aaedd0 and later · before 610c4438fb66e06d9e693c0ad3b2c1be54c0d61faffected · git
    • before 6.17not affected · semver
    • 6.18.60 and later · up to and including 6.18.*not affected · semver
    • 7.2.14 and later · up to and including 7.2.*not affected · semver
    • 7.3.1 and later · up to and including 7.3.*not affected · semver
    • 7.4-rc1 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:14linuxfrom 0—

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-99238Nov 2, 2026 · tracing: Hold trace_types_lock when updating modules in persistent instances
    31Monitor
  • ← EarlierCVE-2026-99239Nov 2, 2026 · Bluetooth: L2CAP: refuse __l2cap_chan_add if chan already has conn
    31Monitor
  • Later →CVE-2026-99241Nov 2, 2026 · ntfs: take invalidate_lock in ntfs_filemap_page_mkwrite()
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux156aeda4d74e9007b56492ed1f3b5838822632beVendor (CNA)
Linux Linux610c4438fb66e06d9e693c0ad3b2c1be54c0d61fVendor (CNA)
Linux Linuxcc190c4073f570fd78a9d00dd3d13a71eced5403Vendor (CNA)
Linux Linuxd5482be6243b816730689099c017109eb8730dd5Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 5, 2026+3 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

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Change log

  1. Fix✗ → ✓
  2. Exploit maturity— → none

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References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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