Answer in brief
CVE-2021-47066 records a High severity (CVSS 7.1) vulnerability in async_xor: increase src_offs when dropping destination page. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=29bcff787a2593b2126cfaff612c0b4e560022e9 <cab2e8e5997b592fdb7d02cf2387b4b8e3057174 || >=29bcff787a2593b2126cfaff612c0b4e560022e9 <29ffa50f33de824b5491f8239c88c4a0efdd03af || >=29bcff787a2593b2126cfaff612c0b4e560022e9 <53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 || >=29bcff787a2593b2126cfaff612c0b4e560022e9 <ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 | cab2e8e5997b592fdb7d02cf2387b4b8e3057174, 29ffa50f33de824b5491f8239c88c4a0efdd03af, 53f8208e11abd6dde9480dfcb97fecdb1bc2ac18, ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 |
| Linux/Linuxgeneric | 5.10 | Not reported |
Published upstream
Feb 29, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-47066 records a High severity (CVSS 7.1) vulnerability in async_xor: increase src_offs when dropping destination page. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=29bcff787a2593b2126cfaff612c0b4e560022e9 <cab2e8e5997b592fdb7d02cf2387b4b8e3057174 || >=29bcff787a2593b2126cfaff612c0b4e560022e9 <29ffa50f33de824b5491f8239c88c4a0efdd03af || >=29bcff787a2593b2126cfaff612c0b4e560022e9 <53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 || >=29bcff787a2593b2126cfaff612c0b4e560022e9 <ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 | cab2e8e5997b592fdb7d02cf2387b4b8e3057174, 29ffa50f33de824b5491f8239c88c4a0efdd03af, 53f8208e11abd6dde9480dfcb97fecdb1bc2ac18, ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 |
| Linux/Linuxgeneric | 5.10 | Not reported |
Published upstream
Feb 29, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.