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Vulnerability · Published May 7, 2025 · Assigned by Linux

CVE-2020-36791net_sched: keep alloc_hash updated after hash allocation

High 7.8

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 90.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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().

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.5.17-1DEBIAN-CVE-2020-36791
Debian:13linux5.5.17-1DEBIAN-CVE-2020-36791
Debian:14linux5.5.17-1DEBIAN-CVE-2020-36791
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2020-36791
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2020-36791
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2020-36791
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2020-36791

Affected products (as reported)

VendorProductVersions
Linux Linux 73c29d2f6f8ae731b1e09051b69ed3ba2319482b – before d6cdc5bb19b595486fb2e6661e5138d73a57f454b974ac51f5834a729de252fc5c1c9de9efd79b45 – before c4453d2833671e3a9f6bd52f0f581056c37363866cb448ee493c8a514c9afa0c346f3f5b3227de85 – before 9f8b6c44be178c2498a00b270872a6e30e7c8266478c4b2ffd44e5186c7e22ae7c38a86a5b9cfde5 – before 557d015ffb27b672e24e6ad141fd887783871dc2dd8142a6fa5270783d415292ec8169f4ea2a5468 – before d23faf32e577922b6da20bf3740625c1105381bf2c66ff8d08f81bcf8e8cb22e31e39c051b15336a – before bd3ee8fb6371b45c71c9345cc359b94da2ddefa9599be01ee567b61f4471ee8078870847d0a11e8e – before 0d1c3530e1bd38382edef72591b78e877e0edcd3
Linux Linux 4.4.214 – before 4.4.2184.9.214 – before 4.9.2184.14.171 – before 4.14.1754.19.103 – before 4.19.1145.4.19 – before 5.4.295.5.3 – before 5.5.14

References