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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate embedded INIT chunk and address list lengths in cookie\n\nsctp_unpack_cookie() only checked that the embedded INIT chunk length\ndid not exceed the remaining cookie payload, but did not ensure that the\nINIT chunk is large enough to contain a complete INIT header.\n\nA malformed COOKIE_ECHO can therefore carry a truncated INIT chunk whose\nlength field is smaller than sizeof(struct sctp_init_chunk).  Later,\nsctp_process_init() accesses INIT parameters unconditionally, which may\nlead to out-of-bounds reads.\n\nIn addition, raw_addr_list_len is not fully validated against the\nremaining cookie payload. When cookie authentication is disabled, an\nattacker can supply an oversized raw_addr_list_len and cause\nsctp_raw_to_bind_addrs() to read beyond the end of the cookie. The\naddress parser also lacks sufficient bounds checks for parameter headers\nand lengths, allowing malformed address parameters to trigger\nout-of-bounds reads.\n\nFix this by:\n\n- requiring the embedded INIT chunk length to be at least sizeof(struct\n  sctp_init_chunk);\n- validating that the INIT chunk and raw address list together fit\n  within the cookie payload;\n- verifying sufficient data exists for each address parameter header and\n  payload before parsing it.\n\nNote that sctp_verify_init() must be called after sctp_unpack_cookie()\nand before sctp_process_init() when cookie authentication is disabled.\nThis will be addressed in a separate patch."
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                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: resample the data fork mapping after cycling ILOCK\n\nxfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode,\na data fork mapping, and a cow fork mapping.  Unfortunately, these two\nhelpers cycle the ILOCK to grab a transaction, which means that the\nmappings are stale as soon as we reacquire the ILOCK.  Currently we\nrefresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but\nwe don\u0027t refresh the data fork mapping beforehand, which means that the\nxfs_bmap_trim_cow in that function queries the refcount btree about the\nwrong physical blocks and returns an inaccurate value in *shared.\n\nIf *shared is now false, the directio write proceeds with a stale data\nfork mapping.  Fix this by querying the data fork mapping if the\nsequence counter changes across the ILOCK cycle."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation uses local FICLONE and concurrent O_DIRECT write syscalls against an XFS filesystem.\nAC:L - The attacker controls both racing writers, can amplify the transaction-allocation window, and demonstrated exploitation typically succeeds within seconds.\nPR:L - A basic unprivileged local user needs only read access to the protected source and write access to a scratch file; no capabilities are required.\nUI:N - The attacker creates the reflink and triggers both sides of the race without any victim action.\nS:U - This is a standard local kernel-mediated privilege escalation affecting resources within the host operating system\u0027s existing security authority.\nC:H - Overwriting /etc/passwd or a readable SUID-root binary yields full root access and consequently unrestricted access to system-confidential data.\nI:H - The stale physical mapping provides attacker-controlled persistent writes into protected readable files while preserving their ownership and SUID metadata, enabling full root compromise.\nA:H - The attacker can persistently corrupt boot-critical binaries or configuration files and, after obtaining root, cause complete system unavailability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:58:23.073Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dc11be133efca5fe3a2fb02b016dee825cc12f18"
        },
        {
          "url": "https://git.kernel.org/stable/c/b8c9aa832b52680ee40d6cab0efb081f9a69df05"
        },
        {
          "url": "https://git.kernel.org/stable/c/50f0012da1040f69a4e788cd9aed587c9a04983f"
        },
        {
          "url": "https://git.kernel.org/stable/c/e705d81a7193dd19e69b8e2bad4696d78a4ea075"
        },
        {
          "url": "https://git.kernel.org/stable/c/206c09b04dc5469c7ff14d8aceff2d47c88078d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/44f891bc088958399eec27f7604928694aa35581"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7"
        },
        {
          "url": "https://cdn2.qualys.com/advisory/2026/07/22/RefluXFS.txt"
        }
      ],
      "title": "xfs: resample the data fork mapping after cycling ILOCK",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64600",
    "datePublished": "2026-07-23T05:46:56.149Z",
    "dateReserved": "2026-07-19T15:36:31.799Z",
    "dateUpdated": "2026-08-17T04:58:23.073Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}