apparmor: fix uninitialised pointer passed to audit_log_untrustedstring()

{
  "id": "82978ecfa385b02e24cf5f4ffef4baa3a1e3898cd723dde37a40bc46ec86fb7f",
  "url": "https://osv.dev/vulnerability/CVE-2026-72455",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "apparmor: fix uninitialised pointer passed to audit_log_untrustedstring()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: apparmor: fix uninitialised pointer passed to audit_log_untrustedstring() Commit 4a134723f9f1 (\"apparmor: move check for aa_null file to cover all cases\") intrdouced a small bug, where path_name() may pass a potentially uninitialized *name to aa_audit_file() if the path->dentry had been replaced with aa_null.dentry earlier on. This can lead to page fault like one observed on 7.0.2 openSUSE Tumbleweed kernel: [51692.242756] [ T24690] BUG: unable to handle page fault for address: 0000000f00000003 [51692.242762] [ T24690] #PF: supervisor read access in kernel mode [51692.242763] [ T24690] #PF: error_code(0x0000) - not-present page [51692.242765] [ T24690] PGD 0 P4D 0 [51692.242768] [ T24690] Oops: Oops: 0000 [#1] SMP NOPTI [51692.242772] [ T24690] CPU: 3 UID: 1020 PID: 24690 Comm: snap-confine Tainted: G O 7.0.2-1-default #1 PREEMPT(full) openSUSE Tumbleweed ab90b4c9940707f9cafa19bdad80b2cec52dbe51 [51692.242775] [ T24690] Tainted: [O]=OOT_MODULE [51692.242777] [ T24690] Hardware name: Framework Laptop 13 (AMD Ryzen 7040Series)/FRANMDCP05, BIOS 03.18 01/08/2026 [51692.242778] [ T24690] RIP: 0010:strlen+0x4/0x30 [51692.242783] [ T24690] Code: f7 75 ec 31 c0 e9 17 9f 00 ff 48 89 f8 e9 0f 9f 00 ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <80> 3f 00 74 18 48 89 f8 0f 1f 40 00 48 83 c0 01 80 38 00 75 f7 48 [51692.242785] [ T24690] RSP: 0018:ffffd015eb1e3608 EFLAGS: 00010282 [51692.24278",
    "evidence": "osv:CVE-2026-72455",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-72455",
      "aliases": [
        "CVE-2026-72455"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b2a8011ae8749215f3939881239b454728a2d88b"
                },
                {
                  "fixed": "2791dd42d41e38805572b12116f721c97c4fcc0c"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4a134723f9f1ad2f3621566259db673350d19cb1"
                },
                {
                  "fixed": "a5c79d44ef19203bd7cf6f3de8ff088112ebff95"
                },
                {
                  "fixed": "bcd1b34c21748531a3febaf7440632b89d8deab7"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6.18.14"
                },
                {
                  "fixed": "6.18.40"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6.19.4"
                },
                {
                  "fixed": "6.20"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d276f52ecaf854e41549311e93802afea0abab5b"
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          ],
          "versions": [
            "v6.18.39",
            "v6.18.38",
            "v6.18.37",
            "v6.18.36",
            "v6.18.35",
            "v6.18.34",
            "v6.18.33",
            "v6.18.32",
            "v6.18.31",
            "v6.18.30",
            "v6.18.29",
            "v6.18.28",
            "v6.18.27",
            "v6.18.26",
            "v6.18.25",
            "v6.18.24",
            "v6.18.23",
            "v6.18.22",
            "v6.18.21",
            "v6.18.20",
            "v6.18.19",
            "v6.18.18",
            "v6.18.17",
            "v6.18.16",
            "v6.18.15",
            "v6.18.14",
            "v6.19.14",
            "v6.19.13",
            "v6.19.12",
            "v6.19.11",
            "v6.19.10",
            "v6.19.9",
            "v6.19.8",
            "v6.19.7",
            "v6.19.6",
            "v6.19.5",
            "v6.19.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72455.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6.18.40"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72455.json"
          }
        }
      ],
      "modified": "2026-10-08T02:51:49.725059662Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2791dd42d41e38805572b12116f721c97c4fcc0c",
        "https://git.kernel.org/stable/c/a5c79d44ef19203bd7cf6f3de8ff088112ebff95",
        "https://git.kernel.org/stable/c/bcd1b34c21748531a3febaf7440632b89d8deab7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72455.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72455",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72455.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72455",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 98351,
  "published_at": "2026-08-15T05:57:02.234+00:00"
}