Vulnerability Details CVE-2020-36791
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().
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 5.5%
CVSS Severity
CVSS v3 Score 7.1
References
- https://blog.cdthoughts.ch/2021/03/16/syzbot-bug.html
- https://git.kernel.org/stable/c/0d1c3530e1bd38382edef72591b78e877e0edcd3
- https://git.kernel.org/stable/c/557d015ffb27b672e24e6ad141fd887783871dc2
- https://git.kernel.org/stable/c/9f8b6c44be178c2498a00b270872a6e30e7c8266
- https://git.kernel.org/stable/c/bd3ee8fb6371b45c71c9345cc359b94da2ddefa9
- https://git.kernel.org/stable/c/c4453d2833671e3a9f6bd52f0f581056c3736386
- https://git.kernel.org/stable/c/d23faf32e577922b6da20bf3740625c1105381bf
- https://git.kernel.org/stable/c/d6cdc5bb19b595486fb2e6661e5138d73a57f454
- https://syzkaller.appspot.com/bug?id=ea260693da894e7b078d18fca2c9c0a19b457534
Products affected by CVE-2020-36791
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cpe:2.3:o:linux:linux_kernel:4.14.171
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cpe:2.3:o:linux:linux_kernel:4.14.172
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cpe:2.3:o:linux:linux_kernel:4.14.173
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cpe:2.3:o:linux:linux_kernel:4.14.174
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cpe:2.3:o:linux:linux_kernel:4.19.103
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cpe:2.3:o:linux:linux_kernel:4.19.104
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cpe:2.3:o:linux:linux_kernel:4.19.105
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cpe:2.3:o:linux:linux_kernel:4.19.106
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cpe:2.3:o:linux:linux_kernel:4.19.107
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cpe:2.3:o:linux:linux_kernel:4.19.108
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cpe:2.3:o:linux:linux_kernel:4.19.109
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cpe:2.3:o:linux:linux_kernel:4.19.110
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cpe:2.3:o:linux:linux_kernel:4.19.111
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cpe:2.3:o:linux:linux_kernel:4.19.112
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cpe:2.3:o:linux:linux_kernel:4.19.113
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cpe:2.3:o:linux:linux_kernel:4.4.214
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cpe:2.3:o:linux:linux_kernel:4.4.215
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cpe:2.3:o:linux:linux_kernel:4.4.216
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cpe:2.3:o:linux:linux_kernel:4.4.217
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cpe:2.3:o:linux:linux_kernel:4.9.214
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cpe:2.3:o:linux:linux_kernel:4.9.215
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cpe:2.3:o:linux:linux_kernel:4.9.216
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cpe:2.3:o:linux:linux_kernel:4.9.217
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cpe:2.3:o:linux:linux_kernel:5.4.19
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cpe:2.3:o:linux:linux_kernel:5.4.20
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cpe:2.3:o:linux:linux_kernel:5.4.21
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cpe:2.3:o:linux:linux_kernel:5.4.22
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cpe:2.3:o:linux:linux_kernel:5.4.23
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cpe:2.3:o:linux:linux_kernel:5.4.24
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cpe:2.3:o:linux:linux_kernel:5.4.25
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cpe:2.3:o:linux:linux_kernel:5.4.26
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cpe:2.3:o:linux:linux_kernel:5.4.27
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cpe:2.3:o:linux:linux_kernel:5.4.28
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cpe:2.3:o:linux:linux_kernel:5.5.10
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cpe:2.3:o:linux:linux_kernel:5.5.11
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cpe:2.3:o:linux:linux_kernel:5.5.12
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cpe:2.3:o:linux:linux_kernel:5.5.13
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cpe:2.3:o:linux:linux_kernel:5.5.3
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cpe:2.3:o:linux:linux_kernel:5.5.4
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cpe:2.3:o:linux:linux_kernel:5.5.5
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cpe:2.3:o:linux:linux_kernel:5.5.6
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cpe:2.3:o:linux:linux_kernel:5.5.7
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cpe:2.3:o:linux:linux_kernel:5.5.8
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cpe:2.3:o:linux:linux_kernel:5.5.9
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cpe:2.3:o:linux:linux_kernel:5.6