CVE-2020-36791 - CVE House
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Status published High CVE-2020-36791

net_sched: keep alloc_hash updated after hash allocation

Vulnerability 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().

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

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Affected Vendor

Affected Software

Linux
Vulnerable Versions:
73c29d2f6f8ae731b1e09051b69ed3ba2319482b, b974ac51f5834a729de252fc5c1c9de9efd79b45, 6cb448ee493c8a514c9afa0c346f3f5b3227de85, 478c4b2ffd44e5186c7e22ae7c38a86a5b9cfde5, dd8142a6fa5270783d415292ec8169f4ea2a5468, 2c66ff8d08f81bcf8e8cb22e31e39c051b15336a, 599be01ee567b61f4471ee8078870847d0a11e8e, 4.4.214, 4.9.214, 4.14.171, 4.19.103, 5.4.19, 5.5.3

Timeline

Official Publish: May 7th, 2025
Last Modified: May 11th, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.