{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a78f9f4668949a6588b8872f162e86685c63d023"
            },
            {
              "fixed": "743ac908282ac97ef6e73ac3a92df2cc8ecb7479"
            },
            {
              "fixed": "04ba24bce61c917b5b3009f0db470cbb72e26a0d"
            },
            {
              "fixed": "b4663405ae29d36011cd712d243456f3f9ab700d"
            },
            {
              "fixed": "6a009f1e61b11d9e23d3c5aa1dacfb010945da45"
            },
            {
              "fixed": "b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec"
            },
            {
              "fixed": "6176313622e34fa3e2b66b9d0682d1e1c6b365c5"
            },
            {
              "fixed": "a3ccb57086dd7652d5ecb826486144198a98a8e9"
            },
            {
              "fixed": "50f0cbec45b0f3fd7e1263d01916518dbf31eb3f"
            },
            {
              "fixed": "0cdc7dde00ec63ac714271fa8b2918d630b8da1a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "92f61d8a31e270f9391e7bcc0ac638bd4262a8e0"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "2.6.34.2"
            },
            {
              "fixed": "2.6.35"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.35"
            },
            {
              "fixed": "5.10.267"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.218"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.185"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.154"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.106"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.47"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.11"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80809.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix missing metadata reservation for large xattrs\n\n[BUG]\nlsetxattr() panics the kernel when setting a large xattr value on a\nfragmented filesystem where the file already has an external xattr\nblock.\n\n[CAUSE]\nocfs2_calc_xattr_set_need() never reserves metadata blocks for a new\nxattr value's extent tree when the file already has an external xattr\nblock. The not_found path leaves meta_add at zero, so meta_ac is NULL\nwhen ocfs2_xattr_extend_allocation() runs.\n\nA new value root has room for a single extent record. On a fragmented\nfilesystem, the allocator cannot satisfy the xattr value in one\ncontiguous run, so each non-contiguous run requires its own extent\nrecord. When the value root's extent list is full and meta_ac is NULL,\nocfs2_add_clusters_in_btree() returns RESTART_META, and\nocfs2_xattr_extend_allocation() hits BUG_ON(why == RESTART_META).\n\n[FIX]\nThe case where no xattr block exists yet already calls\nocfs2_extend_meta_needed(\u0026def_xv.xv.xr_list) to reserve value tree\nmetadata. Add the same reservation to the case where an xattr block\nalready exists, making the two cases consistent.\n\nReplace the BUG_ON with a -ENOSPC return so that if RESTART_META is\nreturned despite the reservation, the error propagates to userspace\ninstead of panicking the kernel.",
  "id": "CVE-2026-80809",
  "modified": "2026-09-06T03:30:52.359577883Z",
  "published": "2026-09-04T15:13:29.769Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/04ba24bce61c917b5b3009f0db470cbb72e26a0d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0cdc7dde00ec63ac714271fa8b2918d630b8da1a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50f0cbec45b0f3fd7e1263d01916518dbf31eb3f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6176313622e34fa3e2b66b9d0682d1e1c6b365c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a009f1e61b11d9e23d3c5aa1dacfb010945da45"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/743ac908282ac97ef6e73ac3a92df2cc8ecb7479"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3ccb57086dd7652d5ecb826486144198a98a8e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b4663405ae29d36011cd712d243456f3f9ab700d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80809.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80809"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ocfs2: fix missing metadata reservation for large xattrs"
}