CVE-2026-43187 (GCVE-0-2026-43187)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-08-05 12:26
VLAI
Title
xfs: delete attr leaf freemap entries when empty
Summary
In the Linux kernel, the following vulnerability has been resolved: xfs: delete attr leaf freemap entries when empty Back in commit 2a2b5932db6758 ("xfs: fix attr leaf header freemap.size underflow"), Brian Foster observed that it's possible for a small freemap at the end of the end of the xattr entries array to experience a size underflow when subtracting the space consumed by an expansion of the entries array. There are only three freemap entries, which means that it is not a complete index of all free space in the leaf block. This code can leave behind a zero-length freemap entry with a nonzero base. Subsequent setxattr operations can increase the base up to the point that it overlaps with another freemap entry. This isn't in and of itself a problem because the code in _leaf_add that finds free space ignores any freemap entry with zero size. However, there's another bug in the freemap update code in _leaf_add, which is that it fails to update a freemap entry that begins midway through the xattr entry that was just appended to the array. That can result in the freemap containing two entries with the same base but different sizes (0 for the "pushed-up" entry, nonzero for the entry that's actually tracking free space). A subsequent _leaf_add can then allocate xattr namevalue entries on top of the entries array, leading to data loss. But fixing that is for later. For now, eliminate the possibility of confusion by zeroing out the base of any freemap entry that has zero size. Because the freemap is not intended to be a complete index of free space, a subsequent failure to find any free space for a new xattr will trigger block compaction, which regenerates the freemap. It looks like this bug has been in the codebase for quite a long time.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f3c0d1fc1eadbb4adbee5ab7757d41d35f48325b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aa9083d97e2157da3c6fb45ddb1a97af7f188f7f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a631899025d47ea1aa6464d76db5b4d3b6d196fd (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ffaf5c99d0f862db021fb1af8b813c1416b1beb2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e1b8c6452ee99a30e188a88f3f3f804fb1c6004a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f31a8334e1c54b126fcecf98645a49b6bc5ad399 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 479b05fc3ee272090f671b06a41f3da8aa78eece (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6f13c1d2a6271c2e73226864a0e83de2770b6f34 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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            "fs/xfs/libxfs/xfs_attr_leaf.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: delete attr leaf freemap entries when empty\n\nBack in commit 2a2b5932db6758 (\"xfs: fix attr leaf header freemap.size\nunderflow\"), Brian Foster observed that it\u0027s possible for a small\nfreemap at the end of the end of the xattr entries array to experience\na size underflow when subtracting the space consumed by an expansion of\nthe entries array.  There are only three freemap entries, which means\nthat it is not a complete index of all free space in the leaf block.\n\nThis code can leave behind a zero-length freemap entry with a nonzero\nbase.  Subsequent setxattr operations can increase the base up to the\npoint that it overlaps with another freemap entry.  This isn\u0027t in and of\nitself a problem because the code in _leaf_add that finds free space\nignores any freemap entry with zero size.\n\nHowever, there\u0027s another bug in the freemap update code in _leaf_add,\nwhich is that it fails to update a freemap entry that begins midway\nthrough the xattr entry that was just appended to the array.  That can\nresult in the freemap containing two entries with the same base but\ndifferent sizes (0 for the \"pushed-up\" entry, nonzero for the entry\nthat\u0027s actually tracking free space).  A subsequent _leaf_add can then\nallocate xattr namevalue entries on top of the entries array, leading to\ndata loss.  But fixing that is for later.\n\nFor now, eliminate the possibility of confusion by zeroing out the base\nof any freemap entry that has zero size.  Because the freemap is not\nintended to be a complete index of free space, a subsequent failure to\nfind any free space for a new xattr will trigger block compaction, which\nregenerates the freemap.\n\nIt looks like this bug has been in the codebase for quite a long time."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:N - XFS xattr set/remove operations can be reached over network file services such as NFSv4.2 SETXATTR/REMOVEXATTR and ksmbd EA handling when an XFS filesystem is exported. Those paths call the VFS xattr helpers and then `xfs_xattr_set`, reaching the vulnerable XFS attr leaf code.\nAC:L - There is no race or external timing dependency; the attacker controls the xattr names, values, sizes, and operation sequence needed to groom the leaf freemap. The required leaf-block state is produced deterministically by repeated xattr operations on a writable file.\nPR:L - The path is gated by file-service or VFS write permission checks, but an unprivileged user with write access to a regular file can set `user.*` xattrs without capabilities. Remote exploitation through NFS/SMB similarly requires only low-privilege write access to the exported object, not administrator privileges.\nUI:N - Once the attacker has access to a writable XFS-backed object, they can trigger the vulnerable xattr operations directly. No separate victim action is required.\nS:U - The corruption occurs within the kernel filesystem and affects resources governed by the same kernel/filesystem security authority. It does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The freemap confusion can cause xattr name/value storage to overlap the leaf entry array, corrupting namespace, index, and value metadata used for later xattr reads. Because this can misdirect disclosure of filesystem xattr metadata and values, the high-impact choice is warranted.\nI:H - The bug permits controlled corruption of XFS extended-attribute leaf metadata and can allocate new xattr data on top of existing entries. This can cause data loss and modification of security-relevant xattr metadata, so integrity impact is high.\nA:H - The corrupted attr leaf state can lead to filesystem metadata corruption, verifier/assertion failures, and XFS shutdown, as shown by the related freemap-collision fixes. Loss of access to the affected filesystem is a high availability impact."
            }
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        "dateUpdated": "2026-08-05T12:26:25.415Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/6f13c1d2a6271c2e73226864a0e83de2770b6f34"
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      ],
      "title": "xfs: delete attr leaf freemap entries when empty",
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    "cveId": "CVE-2026-43187",
    "datePublished": "2026-05-06T11:27:57.727Z",
    "dateReserved": "2026-05-01T14:12:55.991Z",
    "dateUpdated": "2026-08-05T12:26:25.415Z",
    "state": "PUBLISHED"
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      "date": "2026-08-05",
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Subsequent setxattr operations can increase the base up to the\\npoint that it overlaps with another freemap entry.  This isn\u0027t in and of\\nitself a problem because the code in _leaf_add that finds free space\\nignores any freemap entry with zero size.\\n\\nHowever, there\u0027s another bug in the freemap update code in _leaf_add,\\nwhich is that it fails to update a freemap entry that begins midway\\nthrough the xattr entry that was just appended to the array.  That can\\nresult in the freemap containing two entries with the same base but\\ndifferent sizes (0 for the \\\"pushed-up\\\" entry, nonzero for the entry\\nthat\u0027s actually tracking free space).  A subsequent _leaf_add can then\\nallocate xattr namevalue entries on top of the entries array, leading to\\ndata loss.  But fixing that is for later.\\n\\nFor now, eliminate the possibility of confusion by zeroing out the base\\nof any freemap entry that has zero size.  Because the freemap is not\\nintended to be a complete index of free space, a subsequent failure to\\nfind any free space for a new xattr will trigger block compaction, which\\nregenerates the freemap.\\n\\nIt looks like this bug has been in the codebase for quite a long time.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/xfs/libxfs/xfs_attr_leaf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"f3c0d1fc1eadbb4adbee5ab7757d41d35f48325b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"aa9083d97e2157da3c6fb45ddb1a97af7f188f7f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"a631899025d47ea1aa6464d76db5b4d3b6d196fd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"ffaf5c99d0f862db021fb1af8b813c1416b1beb2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e1b8c6452ee99a30e188a88f3f3f804fb1c6004a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"f31a8334e1c54b126fcecf98645a49b6bc5ad399\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"479b05fc3ee272090f671b06a41f3da8aa78eece\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"6f13c1d2a6271c2e73226864a0e83de2770b6f34\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/xfs/libxfs/xfs_attr_leaf.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\":\"5.10.252\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.202\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.165\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.128\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.75\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.16\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.6\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-191\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.12.1\",\"versionEndExcluding\":\"5.10.252\",\"matchCriteriaId\":\"68B6D2AD-7565-4394-B77B-A1EEBCDF590F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.202\",\"matchCriteriaId\":\"4002FC2B-1456-4666-B240-0EBF590C4671\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.165\",\"matchCriteriaId\":\"797C7F46-D0BE-4FB8-A502-C5EF8E6B6654\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.128\",\"matchCriteriaId\":\"851E9353-6C09-4CC9-877E-E09DB164A3C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.75\",\"matchCriteriaId\":\"BCE16369-98ED-41CF-8995-DFDC10B288D2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.16\",\"matchCriteriaId\":\"B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T12:50:34+00:00",
      "cve": "CVE-2026-43187",
      "id": "CVE-2026-43187",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfs: delete attr leaf freemap entries when empty",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43187.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T13:11:51Z",
      "cve": "CVE-2026-43187",
      "id": "CVE-2026-43187",
      "initial_release_date": "2026-05-09T02:41:24Z",
      "product_status:first_fixed": "68",
      "product_status:known_affected": "586",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "179",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43187",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43187.json",
      "version": "11"
    }
  }
}



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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.