CVE-2021-47066 - Vulnerability Details - OpenCVE

ReportizFlow

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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

No data.

No data.

No data.

References

Link	Providers
https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af
https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18
https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174
https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8
https://lore.kernel.org/linux-cve-announce/2024022954-CVE-2021-47066-02e0@gregkh/T/#u
https://nvd.nist.gov/vuln/detail/CVE-2021-47066
https://www.cve.org/CVERecord?id=CVE-2021-47066

History

Mon, 04 Nov 2024 13:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-02-29T22:37:39.917Z

Updated: 2024-12-19T07:34:37.141Z

Reserved: 2024-02-29T22:33:44.296Z

Link: CVE-2021-47066

Vulnrichment

Updated: 2024-08-04T05:24:39.523Z

NVD

Status : Awaiting Analysis

Published: 2024-02-29T23:15:08.057

Modified: 2024-11-21T06:35:18.120

Link: CVE-2021-47066

Redhat

Severity : Moderate

Publid Date: 2024-02-29T00:00:00Z

Links: CVE-2021-47066 - Bugzilla

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{"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."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: async_xor: aumenta src_offs al eliminar la p\u00e1gina de destino. Ahora admitimos compartir una p\u00e1gina si PAGE_SIZE no tiene el mismo tama\u00f1o de banda. Para respaldar esto, debe admitir el c\u00e1lculo del valor xor con diferentes compensaciones para cada r5dev. Se utiliza una matriz de desplazamiento para registrar esos desplazamientos. En el modo RMW, la p\u00e1gina de paridad se utiliza como p\u00e1gina de origen. Establece ASYNC_TX_XOR_DROP_DST antes de calcular el valor xor en ops_run_prexor5. 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 limpieza."}], "id": "CVE-2021-47066", "lastModified": "2024-11-21T06:35:18.120", "metrics": {}, "published": "2024-02-29T23:15:08.057", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: async_xor: increase src_offs when dropping destination page cause data corruption", "id": "2267162", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267162"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:L", "status": "draft"}, "cwe": "CWE-222", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nasync_xor: increase src_offs when dropping destination page\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.\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.\nI can reproduce this problem 100% on a POWER8 machine. The steps are:\nmdadm -CR /dev/md0 -l5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 --size=3G\nmkfs.xfs /dev/md0\nmount /dev/md0 /mnt/test\nmount: /mnt/test: mount(2) system call failed: Structure needs cleaning.", "A data corruption flaw was found in the Linux kernel."], "name": "CVE-2021-47066", "package_state": [{"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-02-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47066\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47066\nhttps://lore.kernel.org/linux-cve-announce/2024022954-CVE-2021-47066-02e0@gregkh/T/#u"], "threat_severity": "Moderate", "upstream_fix": "kernel 5.10.37, kernel 5.11.21, kernel 5.12.4, kernel 5.13"}