CVE-2026-43187

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43187", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.991Z", "datePublished": "2026-05-06T11:27:57.727Z", "dateUpdated": "2026-10-19T19:16:23.230Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:25.415Z"}, "descriptions": [{"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's 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't 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's 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's 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": {"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"}, "scenarios": [{"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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/xfs/libxfs/xfs_attr_leaf.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "f3c0d1fc1eadbb4adbee5ab7757d41d35f48325b", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "aa9083d97e2157da3c6fb45ddb1a97af7f188f7f", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "a631899025d47ea1aa6464d76db5b4d3b6d196fd", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "ffaf5c99d0f862db021fb1af8b813c1416b1beb2", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e1b8c6452ee99a30e188a88f3f3f804fb1c6004a", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "f31a8334e1c54b126fcecf98645a49b6bc5ad399", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "479b05fc3ee272090f671b06a41f3da8aa78eece", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6f13c1d2a6271c2e73226864a0e83de2770b6f34", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/xfs/libxfs/xfs_attr_leaf.c"], "versions": [{"version": "2.6.12", "status": "affected"}, {"version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.252", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.202", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.165", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.252"}, {"vulnerable": true, "criteria": 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"versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f3c0d1fc1eadbb4adbee5ab7757d41d35f48325b"}, {"url": "https://git.kernel.org/stable/c/aa9083d97e2157da3c6fb45ddb1a97af7f188f7f"}, {"url": "https://git.kernel.org/stable/c/a631899025d47ea1aa6464d76db5b4d3b6d196fd"}, {"url": "https://git.kernel.org/stable/c/ffaf5c99d0f862db021fb1af8b813c1416b1beb2"}, {"url": "https://git.kernel.org/stable/c/e1b8c6452ee99a30e188a88f3f3f804fb1c6004a"}, {"url": "https://git.kernel.org/stable/c/f31a8334e1c54b126fcecf98645a49b6bc5ad399"}, {"url": "https://git.kernel.org/stable/c/479b05fc3ee272090f671b06a41f3da8aa78eece"}, {"url": "https://git.kernel.org/stable/c/6f13c1d2a6271c2e73226864a0e83de2770b6f34"}], "title": "xfs: delete attr leaf freemap entries when empty", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43187", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:15:27.998088Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:16:23.230Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43187", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:15:27.998088Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:15:28.541Z"}}], "cna": {"title": "xfs: delete attr leaf freemap entries when empty", "metrics": [{"cvssV3_1": {"version": "3.1", "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"}, "scenarios": [{"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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "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"}], "programFiles": ["fs/xfs/libxfs/xfs_attr_leaf.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.252", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.202", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.165", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.128", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.75", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.16", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.6", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/xfs/libxfs/xfs_attr_leaf.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/f3c0d1fc1eadbb4adbee5ab7757d41d35f48325b"}, {"url": "https://git.kernel.org/stable/c/aa9083d97e2157da3c6fb45ddb1a97af7f188f7f"}, {"url": "https://git.kernel.org/stable/c/a631899025d47ea1aa6464d76db5b4d3b6d196fd"}, {"url": "https://git.kernel.org/stable/c/ffaf5c99d0f862db021fb1af8b813c1416b1beb2"}, {"url": "https://git.kernel.org/stable/c/e1b8c6452ee99a30e188a88f3f3f804fb1c6004a"}, {"url": "https://git.kernel.org/stable/c/f31a8334e1c54b126fcecf98645a49b6bc5ad399"}, {"url": "https://git.kernel.org/stable/c/479b05fc3ee272090f671b06a41f3da8aa78eece"}, {"url": "https://git.kernel.org/stable/c/6f13c1d2a6271c2e73226864a0e83de2770b6f34"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"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's 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't 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's 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's 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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.252", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.202", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.165", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.128", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.75", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.16", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.6", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "2.6.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:25.415Z"}}}, "cveMetadata": {"cveId": "CVE-2026-43187", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:16:23.230Z", "dateReserved": "2026-05-01T14:12:55.991Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-06T11:27:57.727Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"versionEndExcluding": "6.18.16", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67", "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*", "matchCriteriaId": "6F62EECE-8FB1-4D57-85D8-CB9E23CF313C", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:*", "matchCriteriaId": "4F76C298-81DC-43E4-8FC9-DC005A2116EF", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:*", "matchCriteriaId": "0AB349B2-3F78-4197-882B-90ADB3BF645A", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:*", "matchCriteriaId": "6AC88830-A9BC-4607-B572-A4B502FC9FD0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:*", "matchCriteriaId": "476CB3A5-D022-4F13-AAEF-CB6A5785516A", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"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's 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't 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's 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's 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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxfs: eliminar entradas de freemap de hoja de atributo cuando est\u00e1n vac\u00edas\n\nEn el commit 2a2b5932db6758 (\u2019xfs: corregir desbordamiento negativo de freemap.size en cabecera de hoja de atributo\u2019), Brian Foster observ\u00f3 que es posible que un peque\u00f1o freemap al final del final del array de entradas xattr experimente un desbordamiento negativo de tama\u00f1o al restar el espacio consumido por una expansi\u00f3n del array de entradas. Solo hay tres entradas de freemap, lo que significa que no es un \u00edndice completo de todo el espacio libre en el bloque de hoja.\n\nEste c\u00f3digo puede dejar atr\u00e1s una entrada de freemap de longitud cero con una base distinta de cero. Operaciones setxattr posteriores pueden aumentar la base hasta el punto en que se superpone con otra entrada de freemap. Esto no es en s\u00ed mismo un problema porque el c\u00f3digo en _leaf_add que encuentra espacio libre ignora cualquier entrada de freemap con tama\u00f1o cero.\n\nSin embargo, hay otro error en el c\u00f3digo de actualizaci\u00f3n de freemap en _leaf_add, que es que no actualiza una entrada de freemap que comienza a mitad de la entrada xattr que acaba de ser a\u00f1adida al array. Eso puede resultar en que el freemap contenga dos entradas con la misma base pero diferentes tama\u00f1os (0 para la entrada \u2019pushed-up\u2019, distinto de cero para la entrada que realmente est\u00e1 rastreando el espacio libre). Un _leaf_add posterior puede entonces asignar entradas de nombre-valor xattr encima del array de entradas, lo que lleva a la p\u00e9rdida de datos. Pero arreglar eso es para m\u00e1s tarde.\n\nPor ahora, elimine la posibilidad de confusi\u00f3n poniendo a cero la base de cualquier entrada de freemap que tenga tama\u00f1o cero. Debido a que el freemap no est\u00e1 destinado a ser un \u00edndice completo de espacio libre, un fallo posterior al encontrar cualquier espacio libre para un nuevo xattr activar\u00e1 la compactaci\u00f3n de bloques, lo que regenera el freemap.\n\nParece que este error ha estado en la base de c\u00f3digo durante bastante tiempo."}], "id": "CVE-2026-43187", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43187", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:15:27.998088Z", "version": "2.0.3"}}]}, "published": "2026-05-06T12:16:37.440", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/479b05fc3ee272090f671b06a41f3da8aa78eece"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f13c1d2a6271c2e73226864a0e83de2770b6f34"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a631899025d47ea1aa6464d76db5b4d3b6d196fd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aa9083d97e2157da3c6fb45ddb1a97af7f188f7f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e1b8c6452ee99a30e188a88f3f3f804fb1c6004a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f31a8334e1c54b126fcecf98645a49b6bc5ad399"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f3c0d1fc1eadbb4adbee5ab7757d41d35f48325b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ffaf5c99d0f862db021fb1af8b813c1416b1beb2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-191"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-190"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: xfs: delete attr leaf freemap entries when empty", "id": "2467097", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467097"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["A flaw was found in the Linux kernel's XFS filesystem. Incorrect handling of freemap entries when deleting attribute leaf freemap entries can lead to a situation where zero-length freemap entries with a non-zero base are left behind. Subsequent `setxattr` operations can cause these entries to overlap with other freemap entries. This can result in the allocation of extended attribute (xattr) name-value entries on top of existing data, leading to data loss."], "name": "CVE-2026-43187", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43187\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43187\nhttps://lore.kernel.org/linux-cve-announce/2026050641-CVE-2026-43187-6b4a@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,f3c0d1fc1eadbb4adbee5ab7757d41d35f48325b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,aa9083d97e2157da3c6fb45ddb1a97af7f188f7f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,a631899025d47ea1aa6464d76db5b4d3b6d196fd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,ffaf5c99d0f862db021fb1af8b813c1416b1beb2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e1b8c6452ee99a30e188a88f3f3f804fb1c6004a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,f31a8334e1c54b126fcecf98645a49b6bc5ad399)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,479b05fc3ee272090f671b06a41f3da8aa78eece)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,6f13c1d2a6271c2e73226864a0e83de2770b6f34)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.252,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.202,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.165,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.128,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.75,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.16,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.19.6,6.19.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-06T15:00:07.179443+00:00", "updated": "2026-05-11T22:45:36.359705+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}