CVE-2021-47066 (GCVE-0-2021-47066)

Vulnerability from cvelistv5 – Published: 2024-02-29 22:37 – Updated: 2026-08-05 08:45
VLAI
Title
async_xor: increase src_offs when dropping destination page
Summary
In the Linux kernel, the following vulnerability has been resolved: async_xor: increase src_offs when dropping destination page Now we support sharing one page if PAGE_SIZE is not equal stripe size. To support this, it needs to support calculating xor value with different offsets for each r5dev. One offset array is used to record those offsets. In RMW mode, parity page is used as a source page. It sets ASYNC_TX_XOR_DROP_DST before calculating xor value in ops_run_prexor5. So it needs to add src_list and src_offs at the same time. Now it only needs src_list. So the xor value which is calculated is wrong. It can cause data corruption problem. I can reproduce this problem 100% on a POWER8 machine. The steps are: mdadm -CR /dev/md0 -l5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 --size=3G mkfs.xfs /dev/md0 mount /dev/md0 /mnt/test mount: /mnt/test: mount(2) system call failed: Structure needs cleaning.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-01 15:52 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 29bcff787a2593b2126cfaff612c0b4e560022e9 , < cab2e8e5997b592fdb7d02cf2387b4b8e3057174 (git)
Affected: 29bcff787a2593b2126cfaff612c0b4e560022e9 , < 29ffa50f33de824b5491f8239c88c4a0efdd03af (git)
Affected: 29bcff787a2593b2126cfaff612c0b4e560022e9 , < 53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 (git)
Affected: 29bcff787a2593b2126cfaff612c0b4e560022e9 , < ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.37 , ≤ 5.10.* (semver)
Unaffected: 5.11.21 , ≤ 5.11.* (semver)
Unaffected: 5.12.4 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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Por lo tanto, es necesario agregar src_list y src_offs al mismo tiempo. Ahora s\u00f3lo necesita src_list. Entonces el valor xor que se calcula es incorrecto. Puede causar problemas de corrupci\u00f3n de datos. Puedo reproducir este problema al 100% en una m\u00e1quina POWER8. Los pasos son: mdadm -CR /dev/md0 -l5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 --size=3G mkfs.xfs /dev/md0 mount /dev/md0 /mnt/test mount: /mnt/test: la llamada al sistema mount(2) fall\u00f3: la estructura necesita 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T20:09:55+00:00",
      "cve": "CVE-2021-47066",
      "id": "CVE-2021-47066",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "28",
      "product_status:known_not_affected": "170",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: async_xor: increase src_offs when dropping destination page cause data corruption",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47066.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T17:36:01Z",
      "cve": "CVE-2021-47066",
      "id": "CVE-2021-47066",
      "initial_release_date": "2024-03-02T05:48:50Z",
      "product_status:known_not_affected": "292",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47066",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47066.json",
      "version": "17"
    },
    "vulnrichment": {
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no attacker-uncontrollable race is required.\\nPR:L - Creating the array needs CAP_SYS_ADMIN, but once a RAID5 filesystem is mounted, an unprivileged user with write access triggers RMW/prexor through ordinary file writes.\\nUI:N - The attacker triggers the bug by writing their own data; no separate victim action such as mounting or opening a crafted file is required.\\nS:U - Impact stays within the local kernel/storage authority (corrupt RAID parity/data on that host); there is no VM escape, IOMMU bypass, or other cross-boundary effect.\\nC:N - Wrong `src_offs` only mis-selects in-page RAID stripe buffers for XOR; there is no OOB/UAF read or other disclosure of unrelated kernel or user memory.\\nI:H - Incorrect parity from the broken XOR causes persistent RAID5 data corruption (filesystem contents/metadata can be destroyed, as in the reported unmountable XFS case).\\nA:H - The resulting corruption can render the filesystem unusable (e.g. mount fails with \\\"Structure needs cleaning\\\"), fully denying access to the stored volume.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"29bcff787a2593b2126cfaff612c0b4e560022e9\", \"lessThan\": \"cab2e8e5997b592fdb7d02cf2387b4b8e3057174\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"29bcff787a2593b2126cfaff612c0b4e560022e9\", \"lessThan\": \"29ffa50f33de824b5491f8239c88c4a0efdd03af\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"29bcff787a2593b2126cfaff612c0b4e560022e9\", \"lessThan\": \"53f8208e11abd6dde9480dfcb97fecdb1bc2ac18\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"29bcff787a2593b2126cfaff612c0b4e560022e9\", \"lessThan\": \"ceaf2966ab082bbc4d26516f97b3ca8a676e2af8\", \"versionType\": \"git\"}], \"programFiles\": [\"crypto/async_tx/async_xor.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.37\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"crypto/async_tx/async_xor.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174\"}, {\"url\": \"https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af\"}, {\"url\": \"https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18\"}, {\"url\": \"https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nasync_xor: increase src_offs when dropping destination page\\n\\nNow we support sharing one page if PAGE_SIZE is not equal stripe size. To\\nsupport this, it needs to support calculating xor value with different\\noffsets for each r5dev. One offset array is used to record those offsets.\\n\\nIn RMW mode, parity page is used as a source page. It sets\\nASYNC_TX_XOR_DROP_DST before calculating xor value in ops_run_prexor5.\\nSo it needs to add src_list and src_offs at the same time. Now it only\\nneeds src_list. So the xor value which is calculated is wrong. It can\\ncause data corruption problem.\\n\\nI can reproduce this problem 100% on a POWER8 machine. The steps are:\\n\\n  mdadm -CR /dev/md0 -l5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 --size=3G\\n  mkfs.xfs /dev/md0\\n  mount /dev/md0 /mnt/test\\n  mount: /mnt/test: mount(2) system call failed: Structure needs cleaning.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.37\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.21\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.4\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:45:48.517Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47066\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:45:48.517Z\", \"dateReserved\": \"2024-02-29T22:33:44.296Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-29T22:37:39.917Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
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  }
}



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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

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  • 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.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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Detection rules are retrieved from Rulezet.