The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - mm/damon/sysfs-schemes: delete tried region in regions_rmdirs() DAMON sysfs maintains the DAMOS tried     region directory objects via a linked list. When the user requests refresh of the directories, DAMON sysfs     removes all the region directories first, and then generate updated regions directory on the empty space.
    The removal function (damon_sysfs_scheme_regions_rm_dirs()) only puts the kobj objects. Deletion of the     container region object from the linked list is done inside the kobj release callback function. If somehow     the callback invocation is delayed, the list will contain regions list that gonna be freed. If the updated     region directories creation is started in this situation, the list can be corrupted and use-after-free can     happen. Because the kobj objects are managed by only DAMON sysfs, the issue cannot happen in normal     situation. But, such delays can be made on kernels that built with CONFIG_DEBUG_KOBJECT_RELEASE. On the     kernel, the issue can indeed be reproduced like below. # damo start --damos_action stat # cd     /sys/kernel/mm/damon/admin/kdamonds/0/ # for i in {1..10}; do echo update_schemes_tried_regions > state;
    done # dmesg | grep underflow [ 89.296152] refcount_t: underflow; use-after-free. Fix the issue by     removing the region object from the list when decrementing the reference count. Also update     damos_sysfs_populate_region_dir() to add the region object to the list only after the     kobject_init_and_add() is success, so that fail of kobject_init_and_add() is not leaving the deallocated     object on the list. The issue was discovered [1] by Sashiko. (CVE-2026-64239)

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Linux Distros Unpatched Vulnerability : CVE-2026-64239

high Nessus Plugin ID 330196

Version 1.3

Version 1.2

Version 1.1

Version 1.3 Jul 29, 2026, 6:41 AM CVSS metrics ("CVSSv2 score" set to 6.1) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:C") Detection (updated detection logic) Plugin metadata Plugin Feed: 202607290641
Version 1.2 Jul 29, 2026, 12:29 AM Detection (updated detection logic) Plugin metadata Plugin Feed: 202607290029
Version 1.1 Jul 28, 2026, 3:13 AM New Plugin Feed: 202607280313