# CVE-2020-36791: linux: In the Linux kernel, the following vulnerability has been resolved:  net_sched: keep alloc_hash updated after hash al...

CVE-2020-36791 is fixed in linux on 1 platform, first by DEBIAN-CVE-2020-36791, released May 7, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2020-36791
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 7, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  net_sched: keep alloc_hash updated after hash allocation  In commit 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex") I moved cp->hash calculation before the first tcindex_alloc_perfect_hash(), but cp->alloc_hash is left untouched. This difference could lead to another out of bound access.  cp->alloc_hash should always be the size allocated, we should update it after this tcindex_alloc_perfect_hash().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.5.17-1 | [DEBIAN-CVE-2020-36791](https://patchblox.com/security/data/fix/linux/debian-cve-2020-36791.md) | May 7, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.5.17-1 | [DEBIAN-CVE-2020-36791](https://patchblox.com/security/data/fix/linux/debian-cve-2020-36791.md) | May 7, 2025 |
| Linux | linux Debian 14 | 5.5.17-1 | [DEBIAN-CVE-2020-36791](https://patchblox.com/security/data/fix/linux/debian-cve-2020-36791.md) | May 7, 2025 |

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