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CVE-2020-36791

HIGH

7.1

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().

CVE Details

CVSS v3.1 Score7.1

SeverityHIGH

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

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published5/7/2025

Last Modified11/10/2025

Sourcenvd

Honeypot Sightings0

Affected Products

linux:linux_kernel

Weaknesses (CWE)

CWE-125

References

https://blog.cdthoughts.ch/2021/03/16/syzbot-bug.html(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/0d1c3530e1bd38382edef72591b78e877e0edcd3(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/557d015ffb27b672e24e6ad141fd887783871dc2(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/9f8b6c44be178c2498a00b270872a6e30e7c8266(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/bd3ee8fb6371b45c71c9345cc359b94da2ddefa9(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/c4453d2833671e3a9f6bd52f0f581056c3736386(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/d23faf32e577922b6da20bf3740625c1105381bf(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/d6cdc5bb19b595486fb2e6661e5138d73a57f454(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://syzkaller.appspot.com/bug?id=ea260693da894e7b078d18fca2c9c0a19b457534(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

IOC Correlations

No correlations recorded

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