Answer in brief
CVE-2021-47049 records a High severity (CVSS 8.4) vulnerability in Drivers: hv: vmbus: Use after free in __vmbus_open(). 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 8.4. 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 | >=6f3d791f300618caf82a2be0c27456edd76d5164 <d5c7b42c9f56ca46b286daa537d181bd7f69214f || >=6f3d791f300618caf82a2be0c27456edd76d5164 <f37dd5d1b5d38a79a4f7b8dd7bbb705505f05560 || >=6f3d791f300618caf82a2be0c27456edd76d5164 <2728f289b3270b0e273292b46c534421a33bbfd5 || >=6f3d791f300618caf82a2be0c27456edd76d5164 <3e9bf43f7f7a46f21ec071cb47be92d0874c48da || 6b32d45bd59982751beb8220e442b40b2706647f || >=4.13.9 <4.14 | d5c7b42c9f56ca46b286daa537d181bd7f69214f, f37dd5d1b5d38a79a4f7b8dd7bbb705505f05560, 2728f289b3270b0e273292b46c534421a33bbfd5, 3e9bf43f7f7a46f21ec071cb47be92d0874c48da, 4.14 |
| Linux/Linuxgeneric | 4.14 | Not reported |
Published upstream
Feb 28, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 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: Drivers: hv: vmbus: Use after free in __vmbus_open() The "open_info" variable is added to the &vmbus_connection.chn_msg_list, but the error handling frees "open_info" without removing it from the list. This will result in a use after free. First remove it from the list, and then free it.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-47049 records a High severity (CVSS 8.4) vulnerability in Drivers: hv: vmbus: Use after free in __vmbus_open(). 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 8.4. 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 | >=6f3d791f300618caf82a2be0c27456edd76d5164 <d5c7b42c9f56ca46b286daa537d181bd7f69214f || >=6f3d791f300618caf82a2be0c27456edd76d5164 <f37dd5d1b5d38a79a4f7b8dd7bbb705505f05560 || >=6f3d791f300618caf82a2be0c27456edd76d5164 <2728f289b3270b0e273292b46c534421a33bbfd5 || >=6f3d791f300618caf82a2be0c27456edd76d5164 <3e9bf43f7f7a46f21ec071cb47be92d0874c48da || 6b32d45bd59982751beb8220e442b40b2706647f || >=4.13.9 <4.14 | d5c7b42c9f56ca46b286daa537d181bd7f69214f, f37dd5d1b5d38a79a4f7b8dd7bbb705505f05560, 2728f289b3270b0e273292b46c534421a33bbfd5, 3e9bf43f7f7a46f21ec071cb47be92d0874c48da, 4.14 |
| Linux/Linuxgeneric | 4.14 | Not reported |
Published upstream
Feb 28, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 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: Drivers: hv: vmbus: Use after free in __vmbus_open() The "open_info" variable is added to the &vmbus_connection.chn_msg_list, but the error handling frees "open_info" without removing it from the list. This will result in a use after free. First remove it from the list, and then free it.
Quoted source text, attributed separately from HOL analysis.