{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d4ed4a530562881cc5225050e42d96034f405aae"
            },
            {
              "fixed": "1ed45c8d96498725eb54f740172f9068d8673906"
            },
            {
              "fixed": "6265103e78f0ee7e2518de9cf938b94bee9700a0"
            },
            {
              "fixed": "3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070"
            },
            {
              "fixed": "fa4aa86fff0c56799c2e3f51a88879053285f4a9"
            },
            {
              "fixed": "dbfd83f722a78446ec18a476ef7a38e52240b50a"
            },
            {
              "fixed": "d1bba38574d095f191557d397d9633f08cd966b1"
            },
            {
              "fixed": "51c8d238fe7236de627ab1a1433694552a904136"
            },
            {
              "fixed": "437b6551cfcc235eea1d735a874f9d421f555e17"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.9.0"
            },
            {
              "fixed": "5.10.266"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.217"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.184"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.153"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.105"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.46"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80561.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: fix multiple unsafe decodes in decode_locker()\n\ndecode_locker() in cls_lock_client.c contains three unsafe decode\noperations that allow a malicious or compromised OSD to trigger\nslab-out-of-bounds reads:\n\n1. ceph_decode_copy() at the locker_id_t name field has no preceding\n   bounds check. With p == end after ceph_start_decoding() accepts\n   struct_len=0, this reads sizeof(ceph_entity_name) = 9 bytes past\n   the validated buffer boundary.\n\n2. *p += sizeof(struct ceph_timespec) after the locker_info_t header\n   is an unchecked pointer advance. A malicious OSD can position p\n   past end, causing all subsequent _safe checks to pass against a\n   bogus boundary.\n\n3. len = ceph_decode_32(p) has no preceding bounds check, and the\n   immediately following *p += len is uncapped. A malicious OSD can\n   send len=0xffffffff, advancing p gigabytes past end and escaping\n   the decode window entirely.\n\nFix all three by replacing bare operations with their safe variants:\n  ceph_decode_copy   -\u003e ceph_decode_copy_safe\n  *p += sizeof(...)  -\u003e ceph_decode_skip_n\n  ceph_decode_32(p)  -\u003e ceph_decode_32_safe\n  *p += len          -\u003e ceph_decode_skip_n\n\nA new label is added to return -EINVAL on any bounds violation.\n-EINVAL is appropriate here: the data received from the OSD\nis structurally malformed, which is an invalid argument to the decode\ncontract regardless of whether the caller or the wire is at fault.\n\nAttacker model: a malicious or compromised OSD in a multi-tenant Ceph\ndeployment can trigger this against any kernel client that issues the\nlock.get_info class method (e.g. during RBD exclusive lock acquisition)\nwithout any further privileges beyond OSD session establishment.\n\n[ idryomov: use ceph_decode_skip_string() to skip description, trim\n  changelog ]",
  "id": "CVE-2026-80561",
  "modified": "2026-08-28T03:31:03.766097290Z",
  "published": "2026-08-26T14:37:26.572Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ed45c8d96498725eb54f740172f9068d8673906"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/437b6551cfcc235eea1d735a874f9d421f555e17"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51c8d238fe7236de627ab1a1433694552a904136"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6265103e78f0ee7e2518de9cf938b94bee9700a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1bba38574d095f191557d397d9633f08cd966b1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dbfd83f722a78446ec18a476ef7a38e52240b50a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa4aa86fff0c56799c2e3f51a88879053285f4a9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80561.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80561"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libceph: fix multiple unsafe decodes in decode_locker()"
}