async_xor: increase src_offs when dropping destination page

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2021-47066
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-02-29 23:15:08 UTC
Updated2026-08-04 10:16:43 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 29bcff787a2593b2126cfaff612c0b4e560022e9 cab2e8e5997b592fdb7d02cf2387b4b8e3057174 git Not specified
CNA Linux Linux affected 29bcff787a2593b2126cfaff612c0b4e560022e9 29ffa50f33de824b5491f8239c88c4a0efdd03af git Not specified
CNA Linux Linux affected 29bcff787a2593b2126cfaff612c0b4e560022e9 53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 git Not specified
CNA Linux Linux affected 29bcff787a2593b2126cfaff612c0b4e560022e9 ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 git Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 5.10.37 5.10.* semver Not specified
CNA Linux Linux unaffected 5.11.21 5.11.* semver Not specified
CNA Linux Linux unaffected 5.12.4 5.12.* semver Not specified
CNA Linux Linux unaffected 5.13 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
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