{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a303bb0e58345fe9f7ab2f82b90266f2b5036058"
            },
            {
              "fixed": "66eec4af1e080b695229c9a20635648a6d12fedf"
            },
            {
              "fixed": "4daf06456677177f2a6044729abac59c1b49e87b"
            },
            {
              "fixed": "d5650ddbd4d42c1a916c8fe1a4c4cb573ef810a1"
            },
            {
              "fixed": "42bc06c67d94d5f2a6b33294b0c4b07d8a47c515"
            },
            {
              "fixed": "ebdf4b4f3b1474079980a2e5cd79ad65fb54db57"
            },
            {
              "fixed": "590b07ceea138d49c9b64f65d263aa902d3b4730"
            },
            {
              "fixed": "e36663145abd7024f0281dfb22fdef65f185845b"
            },
            {
              "fixed": "9f00f9cf2be293efe899db67dc5272e3a9c62717"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.13.0"
            },
            {
              "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": "7.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68159.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE\n\n__decode_pg_temp() decodes an user-controlled length but only rejects\nvalues large enough to overflow the allocation; it does not bound it to\nCEPH_PG_MAX_SIZE. The helper backs both pg_temp and pg_upmap decoding, and\napply_upmap()/get_temp_osds() later copy the decoded list into the fixed-size\non-stack array struct ceph_osds.osds[CEPH_PG_MAX_SIZE]. A monitor that sends\nan OSDMap with a pg_temp/pg_upmap entry longer than 32 thus causes a stack\nout-of-bounds write.\n\nAn OSD set for a single PG can never exceed CEPH_PG_MAX_SIZE, so reject longer\nentries at decode time. The bound is well below the old overflow threshold, so\nit also covers the allocation-size overflow the previous check guarded against.\n\n  BUG: KASAN: stack-out-of-bounds in ceph_pg_to_up_acting_osds\n  Write of size 4 ... by task exploit\n   kasan_report (mm/kasan/report.c:595)\n   ceph_pg_to_up_acting_osds (net/ceph/osdmap.c:2617 net/ceph/osdmap.c:2833)\n   calc_target (net/ceph/osd_client.c:1638)\n   __submit_request (net/ceph/osd_client.c:2394)\n   ceph_osdc_start_request (net/ceph/osd_client.c:2490)\n   ceph_osdc_call (net/ceph/osd_client.c:5164)\n   rbd_dev_image_probe (drivers/block/rbd.c:6899)\n   do_rbd_add (drivers/block/rbd.c:7138)\n   ...\n  kernel BUG at net/ceph/osdmap.c:2670!\n\n[ idryomov: do the same in __decode_pg_upmap_items() ]",
  "id": "CVE-2026-68159",
  "modified": "2026-08-25T03:51:36.254420001Z",
  "published": "2026-08-10T11:59:25.697Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42bc06c67d94d5f2a6b33294b0c4b07d8a47c515"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4daf06456677177f2a6044729abac59c1b49e87b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/590b07ceea138d49c9b64f65d263aa902d3b4730"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66eec4af1e080b695229c9a20635648a6d12fedf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f00f9cf2be293efe899db67dc5272e3a9c62717"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5650ddbd4d42c1a916c8fe1a4c4cb573ef810a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e36663145abd7024f0281dfb22fdef65f185845b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ebdf4b4f3b1474079980a2e5cd79ad65fb54db57"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68159.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68159"
    },
    {
      "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: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE"
}