{
  "schema_version": "1.4.0",
  "id": "GHSA-46f8-9r54-mw7h",
  "modified": "2025-09-23T06:30:27Z",
  "published": "2025-09-23T06:30:27Z",
  "aliases": [
    "CVE-2025-39877"
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/sysfs: fix use-after-free in state_show()\n\nstate_show() reads kdamond->damon_ctx without holding damon_sysfs_lock. \nThis allows a use-after-free race:\n\nCPU 0                         CPU 1\n-----                         -----\nstate_show()                  damon_sysfs_turn_damon_on()\nctx = kdamond->damon_ctx;     mutex_lock(&damon_sysfs_lock);\n                              damon_destroy_ctx(kdamond->damon_ctx);\n                              kdamond->damon_ctx = NULL;\n                              mutex_unlock(&damon_sysfs_lock);\ndamon_is_running(ctx);        /* ctx is freed */\nmutex_lock(&ctx->kdamond_lock); /* UAF */\n\n(The race can also occur with damon_sysfs_kdamonds_rm_dirs() and\ndamon_sysfs_kdamond_release(), which free or replace the context under\ndamon_sysfs_lock.)\n\nFix by taking damon_sysfs_lock before dereferencing the context, mirroring\nthe locking used in pid_show().\n\nThe bug has existed since state_show() first accessed kdamond->damon_ctx.",
  "severity": [],
  "affected": [],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39877"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26d29b2ac87a2989071755f9828ebf839b560d4c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3260a3f0828e06f5f13fac69fb1999a6d60d9cff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3858c44341ad49dc7544b19cc9f9ecffaa7cc50e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e87f461d61959647464a94d11ae15c011be58ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/60d7a3d2b985a395318faa1d88da6915fad11c19"
    }
  ],
  "database_specific": {
    "cwe_ids": [],
    "severity": null,
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-23T06:15:47Z"
  }
}