{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80536",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80536"
  ],
  "published": "2026-08-26T14:37:59Z",
  "summary": "xfs: bounds-check buffer log item's dirty bitmap",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: bounds-check buffer log item's dirty bitmap\n\nxlog_recover_do_reg_buffer() replays each dirty region described by a\nbuffer log item's bitmap into the buffer read for that item:\n\n\tmemcpy(xfs_buf_offset(bp, (uint)bit << XFS_BLF_SHIFT),\n\t\titem->ri_buf[i].iov_base,\n\t\tnbits << XFS_BLF_SHIFT);\n\nThe destination offset (bit/nbits, from the logged dirty bitmap) and the\nbuffer size (from the logged blf_len) are both attacker-controlled and\notherwise unrelated, yet the only thing bounding the copy is an ASSERT(),\nwhich compiles away on production kernels. A crafted image logging a\nsmall blf_len together with a bitmap bit past the end of that buffer\ndrives the memcpy() past the buffer's allocation, corrupting adjacent\nkernel heap during mount-time log recovery. This is reachable by anyone\nwho can get a crafted image mounted -- the malicious-filesystem threat\nmodel XFS already guards against elsewhere.\n\nTurn the ASSERT() into a real XFS_IS_CORRUPT() check that aborts recovery\nof the buffer with -EFSCORRUPTED, consistent with the validate-and-fail\nidiom already used in xlog_recover_do_inode_buffer() and\nxfs_dquot_item_recover.c. xlog_recover_do_reg_buffer() therefore becomes\nSTATIC int and its three callers propagate the error.\n\nFound and confirmed with KASAN on a CONFIG_XFS_DEBUG=n build: the crafted\nimage trips a slab-out-of-bounds write before this change and fails\nrecovery cleanly with -EFSCORRUPTED after it.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "upstream_fixed": "6.12.106"
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          "1:6.12.75-1+rpt1": {
            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.106"
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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.46"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.46"
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          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.46"
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          "1:6.18.39-1+rpt1": {
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.46"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80536"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/acb4e26295e7f0e685815a3fd3d70bd8329cefa1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f3859c35a4fbc1c1c58431f684f808e43696891d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f7b5fa83e2c192be922121b764415fa8c7549ea1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b7528b42813f02724a78fce1da24d69d1bfc4d38"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7e32d4eebae6ca24f8a673c107fd7eca1f47afc2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f8288214459ead7e87d26e5822f62c14a4f2ed6b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/edaf5b6bd625356893da20d69a259b34a9de2694"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/813f8136a2ce1fee266d02a7df73db6e8a541604"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-27T12:40:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.4,
      "cvss_v3_severity": "High",
      "scenario": "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."
    }
  }
}