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            {
              "lang": "en",
              "value": "AV:L - The OOB write is only reachable during XFS log recovery at mount time (mount\u2192xfs_mountfs\u2192xfs_log_mount\u2192xlog_recover\u2192xlog_do_recovery_pass pass2\u2192xlog_recover_buf_commit_pass2\u2192xlog_recover_do_reg_buffer); attacker data comes from a local block/loop device image, not from any network protocol handler.\nAC:L - All trigger fields (blf_len, blf_data_map bit/nbits, and logged source bytes in ri_buf) are attacker-authored on-disk log metadata; pairing a small blf_len with a bitmap region past the buffer end deterministically drives memcpy() past the xfs_buf allocation on every mount with no race or uncontrollable layout.\nPR:N - Mounting the crafted image requires no account or capability on the victim host in the malicious-filesystem threat model: an external attacker only supplies removable media or a disk image and desktop/kiosk udisks2 or systemd automount performs the privileged mount on device insertion without attacker credentials.\nUI:N - Once the crafted XFS volume is presented to the host, log recovery in xlog_recover_do_reg_buffer() runs automatically during mount (including read-only mounts) before any file access; the attacker needs no separate victim to open files, click links, or perform additional actions beyond presenting the image.\nS:U - Heap corruption occurs entirely within the mounting host kernel during log replay; impact is confined to the same kernel security authority and does not cross VM, IOMMU, or container sandbox boundaries.\nC:H - KASAN-confirmed slab-out-of-bounds write corrupts adjacent kernel heap objects; such controlled memory corruption is routinely weaponized for arbitrary kernel read primitives and pointer disclosure, not merely a crash.\nI:H - memcpy() writes attacker-controlled bytes from logged ri_buf regions to attacker-chosen offsets beyond the buffer end, giving a controllable out-of-bounds kernel heap write primitive suitable for control-flow hijacking and privilege escalation.\nA:H - The unchecked memcpy() causes slab-out-of-bounds writes during mount-time recovery (KASAN-verified on CONFIG_XFS_DEBUG=n), reliably corrupting kernel heap and capable of provoking kernel oops/panic or persistent denial of service on repeated mount attempts."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T12:40:04.524Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/acb4e26295e7f0e685815a3fd3d70bd8329cefa1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3859c35a4fbc1c1c58431f684f808e43696891d"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7b5fa83e2c192be922121b764415fa8c7549ea1"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7528b42813f02724a78fce1da24d69d1bfc4d38"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e32d4eebae6ca24f8a673c107fd7eca1f47afc2"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8288214459ead7e87d26e5822f62c14a4f2ed6b"
        },
        {
          "url": "https://git.kernel.org/stable/c/edaf5b6bd625356893da20d69a259b34a9de2694"
        },
        {
          "url": "https://git.kernel.org/stable/c/813f8136a2ce1fee266d02a7df73db6e8a541604"
        }
      ],
      "title": "xfs: bounds-check buffer log item\u0027s dirty bitmap",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80536",
    "datePublished": "2026-08-26T14:37:11.584Z",
    "dateReserved": "2026-08-26T14:34:25.765Z",
    "dateUpdated": "2026-10-16T19:26:25.114Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}