{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72459",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72459"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "apparmor: aa_label_alloc use aa_label_free on alloc failure",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: aa_label_alloc use aa_label_free on alloc failure\n\naa_label_alloc() allocates a secid before allocating or taking the label\nproxy. If the later proxy step fails, the error path only freed the label\nmemory, leaking any resources initialized by aa_label_init().\n\nUse aa_label_free() on the failure path so partially initialized labels\nrelease their secid and other label resources before the backing memory is\nfreed.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "upstream_fixed": "6.18.40"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72459"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b14fbacad77d64594228983ec20d61a224f3f491"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b5a9da5d36162d34db0f36abb15420e295176793"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7cb69e109610bba500e1ecb870f7988a4717208a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cc2192899d502e3321e60cf1e91421e7309d089c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf310b044e85d4de670c94295c5d8e4c5bc5e7bc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ae02e603c0b39b29f3ce6fe3efe01b286af1a2a4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6d91479174240f39e9edea250d95fa08c678a207"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/654fe7505dc6889724d4094fa64f89991afabfc3"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is in AppArmor LSM label allocation reached only through local kernel entry points (open/read/exec, unix socket mediation, change_hat/change_profile procattr) on AppArmor-enabled systems, not via remote network packet handling.\nAC:L - Triggering proxy allocation failure after secid allocation requires memory pressure, but an attacker can reliably induce kmalloc/GFP_ATOMIC exhaustion locally (memfd, large mappings, stress) while driving aa_label_merge through routine file or socket operations.\nPR:L - Any unprivileged local process running under AppArmor (default on Ubuntu, Debian, SUSE, Android) can reach aa_label_merge/aa_label_alloc through normal permitted file access, exec domain transitions, or unix-socket mediation without real-root or CAP_MAC_ADMIN.\nUI:N - Exploitation requires no victim or administrator interaction; the attacker uses only their own credentials and syscalls to create memory pressure and invoke AppArmor label-merge paths.\nS:U - Impact is kernel memory corruption, information disclosure, and denial of service within the host kernel security domain; it does not cross a VM, container, or IOMMU security boundary by itself.\nC:H - The error path called kfree() without aa_free_secid(), leaving the global secid xarray pointing at freed aa_label memory; aa_secid_to_label()/apparmor_secid_to_secctx() then dereference attacker-influenced freed slab for arbitrary kernel memory reads.\nI:H - Orphaned secid entries retain dangling aa_label pointers whose vec/profile fields can be reclaimed and sprayed; UAF traversal of those structures is a standard path to heap control and arbitrary kernel writes or code execution.\nA:H - Dereferencing stale label/profile pointers can cause kernel oops/panic, and each successful trigger permanently leaks a secid slot until reboot, eventually exhausting the global secid table and denying all future AppArmor label creation system-wide."
    }
  }
}