CVE-2026-80536 (GCVE-0-2026-80536)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 12:40
VLAI
Title
xfs: bounds-check buffer log item's dirty bitmap
Summary
In the Linux kernel, the following vulnerability has been resolved: xfs: bounds-check buffer log item's dirty bitmap xlog_recover_do_reg_buffer() replays each dirty region described by a buffer log item's bitmap into the buffer read for that item: memcpy(xfs_buf_offset(bp, (uint)bit << XFS_BLF_SHIFT), item->ri_buf[i].iov_base, nbits << XFS_BLF_SHIFT); The destination offset (bit/nbits, from the logged dirty bitmap) and the buffer size (from the logged blf_len) are both attacker-controlled and otherwise unrelated, yet the only thing bounding the copy is an ASSERT(), which compiles away on production kernels. A crafted image logging a small blf_len together with a bitmap bit past the end of that buffer drives the memcpy() past the buffer's allocation, corrupting adjacent kernel heap during mount-time log recovery. This is reachable by anyone who can get a crafted image mounted -- the malicious-filesystem threat model XFS already guards against elsewhere. Turn the ASSERT() into a real XFS_IS_CORRUPT() check that aborts recovery of the buffer with -EFSCORRUPTED, consistent with the validate-and-fail idiom already used in xlog_recover_do_inode_buffer() and xfs_dquot_item_recover.c. xlog_recover_do_reg_buffer() therefore becomes STATIC int and its three callers propagate the error. Found and confirmed with KASAN on a CONFIG_XFS_DEBUG=n build: the crafted image trips a slab-out-of-bounds write before this change and fails recovery cleanly with -EFSCORRUPTED after it.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < acb4e26295e7f0e685815a3fd3d70bd8329cefa1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f3859c35a4fbc1c1c58431f684f808e43696891d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f7b5fa83e2c192be922121b764415fa8c7549ea1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b7528b42813f02724a78fce1da24d69d1bfc4d38 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7e32d4eebae6ca24f8a673c107fd7eca1f47afc2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f8288214459ead7e87d26e5822f62c14a4f2ed6b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < edaf5b6bd625356893da20d69a259b34a9de2694 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 813f8136a2ce1fee266d02a7df73db6e8a541604 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.267 , ≤ 5.10.* (semver)
Unaffected: 5.15.218 , ≤ 5.15.* (semver)
Unaffected: 6.1.185 , ≤ 6.1.* (semver)
Unaffected: 6.6.154 , ≤ 6.6.* (semver)
Unaffected: 6.12.106 , ≤ 6.12.* (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: bounds-check buffer log item\u0027s dirty bitmap\n\nxlog_recover_do_reg_buffer() replays each dirty region described by a\nbuffer log item\u0027s bitmap into the buffer read for that item:\n\n\tmemcpy(xfs_buf_offset(bp, (uint)bit \u003c\u003c XFS_BLF_SHIFT),\n\t\titem-\u003eri_buf[i].iov_base,\n\t\tnbits \u003c\u003c 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\u0027s 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "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."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-27T12:40:04.524Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "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"
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          "url": "https://git.kernel.org/stable/c/7e32d4eebae6ca24f8a673c107fd7eca1f47afc2"
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          "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",
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  "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": "2026-08-27T12:40:04.524Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80536",
      "date": "2026-09-01",
      "epss": "0.00144",
      "percentile": "0.03962"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80536\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-26T15:17:07.777\",\"lastModified\":\"2026-08-27T13:18:38.940\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxfs: bounds-check buffer log item\u0027s dirty bitmap\\n\\nxlog_recover_do_reg_buffer() replays each dirty region described by a\\nbuffer log item\u0027s bitmap into the buffer read for that item:\\n\\n\\tmemcpy(xfs_buf_offset(bp, (uint)bit \u003c\u003c XFS_BLF_SHIFT),\\n\\t\\titem-\u003eri_buf[i].iov_base,\\n\\t\\tnbits \u003c\u003c 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\u0027s 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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/xfs/xfs_buf_item_recover.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"acb4e26295e7f0e685815a3fd3d70bd8329cefa1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"f3859c35a4fbc1c1c58431f684f808e43696891d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"f7b5fa83e2c192be922121b764415fa8c7549ea1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"b7528b42813f02724a78fce1da24d69d1bfc4d38\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"7e32d4eebae6ca24f8a673c107fd7eca1f47afc2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"f8288214459ead7e87d26e5822f62c14a4f2ed6b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"edaf5b6bd625356893da20d69a259b34a9de2694\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"813f8136a2ce1fee266d02a7df73db6e8a541604\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/xfs/xfs_buf_item_recover.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.267\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.218\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.185\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.154\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.106\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.46\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.10\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/7e32d4eebae6ca24f8a673c107fd7eca1f47afc2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/813f8136a2ce1fee266d02a7df73db6e8a541604\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/acb4e26295e7f0e685815a3fd3d70bd8329cefa1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7528b42813f02724a78fce1da24d69d1bfc4d38\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/edaf5b6bd625356893da20d69a259b34a9de2694\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f3859c35a4fbc1c1c58431f684f808e43696891d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7b5fa83e2c192be922121b764415fa8c7549ea1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f8288214459ead7e87d26e5822f62c14a4f2ed6b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T06:33:55+00:00",
      "cve": "CVE-2026-80536",
      "id": "CVE-2026-80536",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfs: bounds-check buffer log item\u0027s dirty bitmap",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80536.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.