{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ea9bae12d02819556db63348db8bd8441eb316f2"
            },
            {
              "fixed": "202824a1f89a9786c20a3d646a7c88d223abb1b2"
            },
            {
              "fixed": "80c334acc6d0bee8605a358a33e69b4aea1ffb92"
            },
            {
              "fixed": "4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169"
            },
            {
              "fixed": "640cf2f09575c9dc344b3f7be2498d31e3923ead"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.75"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45884.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: avoid per-cpu hold underflow in aa_get_buffer\n\nWhen aa_get_buffer() pulls from the per-cpu list it unconditionally\ndecrements cache-\u003ehold. If hold reaches 0 while count is still non-zero,\nthe unsigned decrement wraps to UINT_MAX. This keeps hold non-zero for a\nvery long time, so aa_put_buffer() never returns buffers to the global\nlist, which can starve other CPUs and force repeated kmalloc(aa_g_path_max)\nallocations.\n\nGuard the decrement so hold never underflows.",
  "id": "CVE-2026-45884",
  "modified": "2026-07-08T05:36:49.403699223Z",
  "published": "2026-05-27T12:16:56.542Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/202824a1f89a9786c20a3d646a7c88d223abb1b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/640cf2f09575c9dc344b3f7be2498d31e3923ead"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80c334acc6d0bee8605a358a33e69b4aea1ffb92"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45884.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45884"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "apparmor: avoid per-cpu hold underflow in aa_get_buffer"
}