Answer in brief
CVE-2021-47240 records a High severity (CVSS 8.4) vulnerability in net: qrtr: fix OOB Read in qrtr_endpoint_post. 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 |
| 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 | >=194ccc88297ae78d0803adad83c6dcc369787c9e <f8111c0d7ed42ede41a3d0d393b104de0730a8a6 || >=194ccc88297ae78d0803adad83c6dcc369787c9e <26b8d10703a9be45d6097946b2b4011f7dd2c56f || >=194ccc88297ae78d0803adad83c6dcc369787c9e <960b08dd36de1e341e3eb43d1c547513e338f4f8 || >=194ccc88297ae78d0803adad83c6dcc369787c9e <19892ab9c9d838e2e5a7744d36e4bb8b7c3292fe || >=194ccc88297ae78d0803adad83c6dcc369787c9e <ad9d24c9429e2159d1e279dc3a83191ccb4daf1d | f8111c0d7ed42ede41a3d0d393b104de0730a8a6, 26b8d10703a9be45d6097946b2b4011f7dd2c56f, 960b08dd36de1e341e3eb43d1c547513e338f4f8, 19892ab9c9d838e2e5a7744d36e4bb8b7c3292fe, ad9d24c9429e2159d1e279dc3a83191ccb4daf1d |
| Linux/Linuxgeneric | 4.15 | Not reported |
Published upstream
May 21, 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: net: qrtr: fix OOB Read in qrtr_endpoint_post Syzbot reported slab-out-of-bounds Read in qrtr_endpoint_post. The problem was in wrong _size_ type: if (len != ALIGN(size, 4) + hdrlen) goto err; If size from qrtr_hdr is 4294967293 (0xfffffffd), the result of ALIGN(size, 4) will be 0. In case of len == hdrlen and size == 4294967293 in header this check won't fail and skb_put_data(skb, data + hdrlen, size); will read out of bound from data, which is hdrlen allocated block.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-47240 records a High severity (CVSS 8.4) vulnerability in net: qrtr: fix OOB Read in qrtr_endpoint_post. 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 |
| 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 | >=194ccc88297ae78d0803adad83c6dcc369787c9e <f8111c0d7ed42ede41a3d0d393b104de0730a8a6 || >=194ccc88297ae78d0803adad83c6dcc369787c9e <26b8d10703a9be45d6097946b2b4011f7dd2c56f || >=194ccc88297ae78d0803adad83c6dcc369787c9e <960b08dd36de1e341e3eb43d1c547513e338f4f8 || >=194ccc88297ae78d0803adad83c6dcc369787c9e <19892ab9c9d838e2e5a7744d36e4bb8b7c3292fe || >=194ccc88297ae78d0803adad83c6dcc369787c9e <ad9d24c9429e2159d1e279dc3a83191ccb4daf1d | f8111c0d7ed42ede41a3d0d393b104de0730a8a6, 26b8d10703a9be45d6097946b2b4011f7dd2c56f, 960b08dd36de1e341e3eb43d1c547513e338f4f8, 19892ab9c9d838e2e5a7744d36e4bb8b7c3292fe, ad9d24c9429e2159d1e279dc3a83191ccb4daf1d |
| Linux/Linuxgeneric | 4.15 | Not reported |
Published upstream
May 21, 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: net: qrtr: fix OOB Read in qrtr_endpoint_post Syzbot reported slab-out-of-bounds Read in qrtr_endpoint_post. The problem was in wrong _size_ type: if (len != ALIGN(size, 4) + hdrlen) goto err; If size from qrtr_hdr is 4294967293 (0xfffffffd), the result of ALIGN(size, 4) will be 0. In case of len == hdrlen and size == 4294967293 in header this check won't fail and skb_put_data(skb, data + hdrlen, size); will read out of bound from data, which is hdrlen allocated block.
Quoted source text, attributed separately from HOL analysis.