# CVE-2021-47240: linux: In the Linux kernel, the following vulnerability has been resolved:  net: qrtr: fix OOB Read in qrtr_endpoint_post  S...

CVE-2021-47240 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47240, released May 21, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47240
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.46-1 | [DEBIAN-CVE-2021-47240](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47240.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.46-1 | [DEBIAN-CVE-2021-47240](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47240.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.10.46-1 | [DEBIAN-CVE-2021-47240](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47240.md) | May 21, 2024 |

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