VulnerabilityPublished 2 Nov 2026

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d5482be6243b816730689099c017109eb8730dd5 : update Linux kernel when convenient.

Data as of 2 Nov 2026, 16:31 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in d5482be6243b816730689099c017109eb8730dd5, cc190c4073f570fd78a9d00dd3d13a71eced5403, 156aeda4d74e9007b56492ed1f3b5838822632be +3

Exploitation evidence

Disclosed: evidence found.
CVE published 2 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected <6.18.60 <7.2.14 <7.3.1	Fixed in d5482be6243b816730689099c017109eb8730dd5 cc190c4073f570fd78a9d00dd3d13a71eced5403 156aeda4d74e9007b56492ed1f3b5838822632be 7.3.1 7.2.14 6.18.60
Red Hatredhat/kernel`pkg:rpm/redhat/kernel`Other threats	Affected <6.18.60 <7.2.14 <7.3.1	Fixed in 6.18.60 7.2.14 7.3.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available and has been applied in Linux kernel versions 6.18.60, 7.2.14, and 7.3.1, as well as corresponding commit hashes. Users and administrators should update to these fixed versions to mitigate the vulnerability. The patch moves zero target_value validation to the core layer, preventing division-by-zero errors. No additional mitigation steps are required beyond applying the official fix.

Description

A vulnerability in the Linux kernel's memory management subsystem (DAMON) could cause a division-by-zero error when the DAMON quota target value is zero. This issue arises because zero target values are not properly handled in the quota goal calculation, potentially leading to runtime errors. The problem has been addressed by moving the zero-value validation to the core layer, ensuring consistent handling and preventing division by zero.

Impact

The vulnerability can cause a division-by-zero error in the Linux kernel's DAMON subsystem if a zero target_value is used, which may lead to kernel errors or crashes. The zero target_value is considered meaningless in the quota goal context, and the flaw could cause the quota to be incorrectly evaluated as achieved or over-achieved, potentially affecting memory monitoring functionality. No known exploits in the wild have been reported.

Summary

CVE-2026-99240 describes a flaw in the Linux kernel's DAMON (Data Access MONitor) subsystem where a zero target_value in the damos_quota_goal() function can cause a division-by-zero error. Previously, each DAMON API caller was responsible for validating this parameter, which led to mistakes and bugs in some callers such as DAMON_LRU_SORT and DAMON_SAMPLE_MTIER. The fix consolidates the zero target_value check into the core layer's damos_commit_quota_goal() function, which now returns an error if the target_value is zero, preventing the division-by-zero condition and propagating the error to callers. This patch series improves robustness by centralizing validation and removing redundant checks from API callers.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 2 Nov 2026, 16:31 UTC

Technical details

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