Answer in brief
CVE-2021-47232 records a Critical severity (CVSS 9.8) vulnerability in can: j1939: fix Use-after-Free, hold skb ref while in use. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), linux/linux_kernel (generic), linux/linux_kernel (generic) and additional mapped packages. 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 9.8. 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), linux/linux_kernel (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=9d71dd0c70099914fcd063135da3c580865e924c <22cba878abf646cd3a02ee7c8c2cef7afe66a256 || >=9d71dd0c70099914fcd063135da3c580865e924c <509ab6bfdd0c76daebbad0f0af07da712116de22 || >=9d71dd0c70099914fcd063135da3c580865e924c <1071065eeb33d32b7d98c2ce7591881ae7381705 || >=9d71dd0c70099914fcd063135da3c580865e924c <2030043e616cab40f510299f09b636285e0a3678 | 22cba878abf646cd3a02ee7c8c2cef7afe66a256, 509ab6bfdd0c76daebbad0f0af07da712116de22, 1071065eeb33d32b7d98c2ce7591881ae7381705, 2030043e616cab40f510299f09b636285e0a3678 |
| Linux/Linuxgeneric | 5.4 | Not reported |
| linux/linux_kernelgeneric | >=9d71dd0c7009 <22cba878abf6 | 22cba878abf6 |
| linux/linux_kernelgeneric | >=9d71dd0c7009 <509ab6bfdd0c | 509ab6bfdd0c |
| linux/linux_kernelgeneric | >=9d71dd0c7009 <1071065eeb33 | 1071065eeb33 |
| linux/linux_kernelgeneric | >=9d71dd0c7009 <2030043e616c | 2030043e616c |
| linux/linux_kernelgeneric | 5.4 | Not reported |
Published upstream
May 21, 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: can: j1939: fix Use-after-Free, hold skb ref while in use This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is taken from the per-session skb queue, without incrementing the ref count. This leads to a Use-after-Free if the skb is taken concurrently from the session queue due to a CTS.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-47232 records a Critical severity (CVSS 9.8) vulnerability in can: j1939: fix Use-after-Free, hold skb ref while in use. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), linux/linux_kernel (generic), linux/linux_kernel (generic) and additional mapped packages. 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 9.8. 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), linux/linux_kernel (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=9d71dd0c70099914fcd063135da3c580865e924c <22cba878abf646cd3a02ee7c8c2cef7afe66a256 || >=9d71dd0c70099914fcd063135da3c580865e924c <509ab6bfdd0c76daebbad0f0af07da712116de22 || >=9d71dd0c70099914fcd063135da3c580865e924c <1071065eeb33d32b7d98c2ce7591881ae7381705 || >=9d71dd0c70099914fcd063135da3c580865e924c <2030043e616cab40f510299f09b636285e0a3678 | 22cba878abf646cd3a02ee7c8c2cef7afe66a256, 509ab6bfdd0c76daebbad0f0af07da712116de22, 1071065eeb33d32b7d98c2ce7591881ae7381705, 2030043e616cab40f510299f09b636285e0a3678 |
| Linux/Linuxgeneric | 5.4 | Not reported |
| linux/linux_kernelgeneric | >=9d71dd0c7009 <22cba878abf6 | 22cba878abf6 |
| linux/linux_kernelgeneric | >=9d71dd0c7009 <509ab6bfdd0c | 509ab6bfdd0c |
| linux/linux_kernelgeneric | >=9d71dd0c7009 <1071065eeb33 | 1071065eeb33 |
| linux/linux_kernelgeneric | >=9d71dd0c7009 <2030043e616c | 2030043e616c |
| linux/linux_kernelgeneric | 5.4 | Not reported |
Published upstream
May 21, 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: can: j1939: fix Use-after-Free, hold skb ref while in use This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is taken from the per-session skb queue, without incrementing the ref count. This leads to a Use-after-Free if the skb is taken concurrently from the session queue due to a CTS.
Quoted source text, attributed separately from HOL analysis.