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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未正确更新alloc_hash，可能导致越界访问。

CVSS 7.8 · High EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux 73c29d2f6f8ae731b1e09051b69ed3ba2319482b< d6cdc5bb19b595486fb2e6661e5138d73a57f454 affected
b974ac51f5834a729de252fc5c1c9de9efd79b45< c4453d2833671e3a9f6bd52f0f581056c3736386 affected
6cb448ee493c8a514c9afa0c346f3f5b3227de85< 9f8b6c44be178c2498a00b270872a6e30e7c8266 affected
478c4b2ffd44e5186c7e22ae7c38a86a5b9cfde5< 557d015ffb27b672e24e6ad141fd887783871dc2 affected
dd8142a6fa5270783d415292ec8169f4ea2a5468< d23faf32e577922b6da20bf3740625c1105381bf affected
2c66ff8d08f81bcf8e8cb22e31e39c051b15336a< bd3ee8fb6371b45c71c9345cc359b94da2ddefa9 affected
599be01ee567b61f4471ee8078870847d0a11e8e< 0d1c3530e1bd38382edef72591b78e877e0edcd3 affected
4.4.214< 4.4.218 affected
… +5 more rows
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I. Basic Information for CVE-2020-36791

Vulnerability Information
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Vulnerability Title
net_sched: keep alloc_hash updated after hash allocation
Source: CVE Program / CVE List V5
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().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未正确更新alloc_hash，可能导致越界访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 73c29d2f6f8ae731b1e09051b69ed3ba2319482b ~ d6cdc5bb19b595486fb2e6661e5138d73a57f454 -
Linux Linux 4.4.214 ~ 4.4.218 -

II. Public POCs for CVE-2020-36791

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III. Intelligence Information for CVE-2020-36791

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Patches & Fixes for CVE-2020-36791 (1)

Proof of Concept for CVE-2020-36791 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2020-36791

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