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GHSA-RJC9-Q3Q5-8F95

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 12:30

Details

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

samples/damon/wsse: handle damon_start() failure

Patch series "samples/damon: handle damon_{start,stop}() failures".

All DAMON sample modules are not correctly handling failures from damon_start(). Among those, mtier also has an additional problem for handling of damon_stop() failures. wsse and prcl also have a problem in their damon_call() failure handling. As a result, memory leaks, next DAMON operation disruptions, and use-after-free can happen. Fix those.

Note that only the damon_start() failure caused issues can reliably be reproduced. Reproducing those issues require the admin permission, though.

This patch (of 6):

damon_sample_wsse_start() callers assume it will clean up resources when it fails. And the function does the cleanup for context buildup failures. However, it is not doing the cleanup for damon_start() failure. As a result, when damon_start() fails, it leaks the memory for DAMON context. Free the context in case of the failure to fix the issues.

Note that the issue can reliably be reproduced because the module calls damon_start() in the exclusive mode. For example,

$ sudo damo start
$ echo $$ | sudo tee /sys/module/damon_sample_wsse/parameters/target_pid
$ echo Y | sudo tee /sys/module/damon_sample_wsse/parameters/enabled
$ sudo cat /proc/allocinfo | grep damon_new_ctx

Because the first command is running another DAMON instance, the third command fails the damon_start() call because the new DAMON instance cannot exclusively run. And without this fix, by repeating the third and the fourth commands above, we can show the memory consumption is only increasing due to the leaks. It requires the sudo permission though.

The issue was discovered [1] by Sashiko.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-90005"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T11:17:13Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsamples/damon/wsse: handle damon_start() failure\n\nPatch series \"samples/damon: handle damon_{start,stop}() failures\".\n\nAll DAMON sample modules are not correctly handling failures from\ndamon_start().  Among those, mtier also has an additional problem for\nhandling of damon_stop() failures.  wsse and prcl also have a problem in\ntheir damon_call() failure handling.  As a result, memory leaks, next\nDAMON operation disruptions, and use-after-free can happen.  Fix those.\n\nNote that only the damon_start() failure caused issues can reliably be\nreproduced.  Reproducing those issues require the admin permission,\nthough.\n\n\nThis patch (of 6):\n\ndamon_sample_wsse_start() callers assume it will clean up resources when\nit fails.  And the function does the cleanup for context buildup failures.\nHowever, it is not doing the cleanup for damon_start() failure.  As a\nresult, when damon_start() fails, it leaks the memory for DAMON context. \nFree the context in case of the failure to fix the issues.\n\nNote that the issue can reliably be reproduced because the module calls\ndamon_start() in the exclusive mode.  For example,\n\n    $ sudo damo start\n    $ echo $$ | sudo tee /sys/module/damon_sample_wsse/parameters/target_pid\n    $ echo Y | sudo tee /sys/module/damon_sample_wsse/parameters/enabled\n    $ sudo cat /proc/allocinfo | grep damon_new_ctx\n\nBecause the first command is running another DAMON instance, the third\ncommand fails the damon_start() call because the new DAMON instance cannot\nexclusively run.  And without this fix, by repeating the third and the\nfourth commands above, we can show the memory consumption is only\nincreasing due to the leaks.  It requires the sudo permission though.\n\nThe issue was discovered [1] by Sashiko.",
  "id": "GHSA-rjc9-q3q5-8f95",
  "modified": "2026-09-16T12:30:45Z",
  "published": "2026-09-16T12:30:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90005"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6179c7f47876d576dfe30efa8fbf1b0b1fdd13c0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e4742be45ea45bf554399ce89a09f71e525d7981"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e60774d6335b89fac0be8b17a041fcffc508d281"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-90005 (GCVE-0-2026-90005)

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

Title

samples/damon/wsse: handle damon_start() failure

Summary

In the Linux kernel, the following vulnerability has been resolved: samples/damon/wsse: handle damon_start() failure Patch series "samples/damon: handle damon_{start,stop}() failures". All DAMON sample modules are not correctly handling failures from damon_start(). Among those, mtier also has an additional problem for handling of damon_stop() failures. wsse and prcl also have a problem in their damon_call() failure handling. As a result, memory leaks, next DAMON operation disruptions, and use-after-free can happen. Fix those. Note that only the damon_start() failure caused issues can reliably be reproduced. Reproducing those issues require the admin permission, though. This patch (of 6): damon_sample_wsse_start() callers assume it will clean up resources when it fails. And the function does the cleanup for context buildup failures. However, it is not doing the cleanup for damon_start() failure. As a result, when damon_start() fails, it leaks the memory for DAMON context. Free the context in case of the failure to fix the issues. Note that the issue can reliably be reproduced because the module calls damon_start() in the exclusive mode. For example, $ sudo damo start $ echo $$ | sudo tee /sys/module/damon_sample_wsse/parameters/target_pid $ echo Y | sudo tee /sys/module/damon_sample_wsse/parameters/enabled $ sudo cat /proc/allocinfo | grep damon_new_ctx Because the first command is running another DAMON instance, the third command fails the damon_start() call because the new DAMON instance cannot exclusively run. And without this fix, by repeating the third and the fourth commands above, we can show the memory consumption is only increasing due to the leaks. It requires the sudo permission though. The issue was discovered [1] by Sashiko.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/6179c7f47876d576d…
https://git.kernel.org/stable/c/e60774d6335b89fac…
https://git.kernel.org/stable/c/e4742be45ea45bf55…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b757c6cfc696d43501632861f731412b14a7be86 , < 6179c7f47876d576dfe30efa8fbf1b0b1fdd13c0 (git) Affected: b757c6cfc696d43501632861f731412b14a7be86 , < e60774d6335b89fac0be8b17a041fcffc508d281 (git) Affected: b757c6cfc696d43501632861f731412b14a7be86 , < e4742be45ea45bf554399ce89a09f71e525d7981 (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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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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