CVE-2026-90005 (GCVE-0-2026-90005)
Vulnerability from cvelistv5
Published
2026-09-16 10:33
Modified
2026-10-19 08:56
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: b757c6cfc696d43501632861f731412b14a7be86
Version: b757c6cfc696d43501632861f731412b14a7be86
Version: b757c6cfc696d43501632861f731412b14a7be86
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          "product": "Linux",
          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
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        "dateUpdated": "2026-10-19T08:56:19.196Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6179c7f47876d576dfe30efa8fbf1b0b1fdd13c0"
        },
        {
          "url": "https://git.kernel.org/stable/c/e60774d6335b89fac0be8b17a041fcffc508d281"
        },
        {
          "url": "https://git.kernel.org/stable/c/e4742be45ea45bf554399ce89a09f71e525d7981"
        }
      ],
      "title": "samples/damon/wsse: handle damon_start() failure",
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    }
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90005",
    "datePublished": "2026-09-16T10:33:14.753Z",
    "dateReserved": "2026-09-11T19:38:34.780Z",
    "dateUpdated": "2026-10-19T08:56:19.196Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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