Answer in brief
CVE-2021-46973 records a High severity (CVSS 7.8) vulnerability in net: qrtr: Avoid potential use after free in MHI send. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), linux/linux_kernel (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 7.8. 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), linux/linux_kernel (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 | >=6e728f321393b1fce9e1c2c3e55f9f7c15991321 <48ec949ac979b4b42d740f67b6177797af834f80 || >=6e728f321393b1fce9e1c2c3e55f9f7c15991321 <ea474054c2cc6e1284604b21361f475c7cc8c0a0 || >=6e728f321393b1fce9e1c2c3e55f9f7c15991321 <03c649dee8b1eb5600212a249542a70f47a5ab40 || >=6e728f321393b1fce9e1c2c3e55f9f7c15991321 <47a017f33943278570c072bc71681809b2567b3a | 48ec949ac979b4b42d740f67b6177797af834f80, ea474054c2cc6e1284604b21361f475c7cc8c0a0, 03c649dee8b1eb5600212a249542a70f47a5ab40, 47a017f33943278570c072bc71681809b2567b3a |
| Linux/Linuxgeneric | 5.8 | Not reported |
| linux/linux_kernelgeneric | >=6e728f321393 <48ec949ac979 || >=6e728f321393 <ea474054c2cc || 6e728f321393 || >=6e728f321393 <47a017f33943 || 5.8 | 48ec949ac979, ea474054c2cc, 47a017f33943 |
Published upstream
Feb 27, 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: net: qrtr: Avoid potential use after free in MHI send It is possible that the MHI ul_callback will be invoked immediately following the queueing of the skb for transmission, leading to the callback decrementing the refcount of the associated sk and freeing the skb. As such the dereference of skb and the increment of the sk refcount must happen before the skb is queued, to avoid the skb to be used after free and potentially the sk to drop its last refcount..
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-46973 records a High severity (CVSS 7.8) vulnerability in net: qrtr: Avoid potential use after free in MHI send. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), linux/linux_kernel (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 7.8. 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), linux/linux_kernel (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 | >=6e728f321393b1fce9e1c2c3e55f9f7c15991321 <48ec949ac979b4b42d740f67b6177797af834f80 || >=6e728f321393b1fce9e1c2c3e55f9f7c15991321 <ea474054c2cc6e1284604b21361f475c7cc8c0a0 || >=6e728f321393b1fce9e1c2c3e55f9f7c15991321 <03c649dee8b1eb5600212a249542a70f47a5ab40 || >=6e728f321393b1fce9e1c2c3e55f9f7c15991321 <47a017f33943278570c072bc71681809b2567b3a | 48ec949ac979b4b42d740f67b6177797af834f80, ea474054c2cc6e1284604b21361f475c7cc8c0a0, 03c649dee8b1eb5600212a249542a70f47a5ab40, 47a017f33943278570c072bc71681809b2567b3a |
| Linux/Linuxgeneric | 5.8 | Not reported |
| linux/linux_kernelgeneric | >=6e728f321393 <48ec949ac979 || >=6e728f321393 <ea474054c2cc || 6e728f321393 || >=6e728f321393 <47a017f33943 || 5.8 | 48ec949ac979, ea474054c2cc, 47a017f33943 |
Published upstream
Feb 27, 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: net: qrtr: Avoid potential use after free in MHI send It is possible that the MHI ul_callback will be invoked immediately following the queueing of the skb for transmission, leading to the callback decrementing the refcount of the associated sk and freeing the skb. As such the dereference of skb and the increment of the sk refcount must happen before the skb is queued, to avoid the skb to be used after free and potentially the sk to drop its last refcount..
Quoted source text, attributed separately from HOL analysis.