Bug 2266748 (CVE-2020-36776)

Summary:	CVE-2020-36776 kernel: thermal/drivers/cpufreq_cooling: Fix slab OOB issue
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	acaringi, allarkin, aquini, bhu, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, drow, dvlasenk, esandeen, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mleitner, mmilgram, mstowell, nmurray, ptalbert, rparrazo, rrobaina, rvrbovsk, rysulliv, scweaver, sidakwo, sukulkar, tglozar, tyberry, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.10.36, kernel 5.11.20, kernel 5.12.3, kernel 5.13	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernel. The cpu_power_to_freq function in the drivers/thermal/cpufreq_cooling.c file can trigger an out-of-bounds read vulnerability when the power value cannot be found in the EM table. This issue can result in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2266749
Bug Blocks:	2267043

Description Mauro Matteo Cascella 2024-02-28 21:35:25 UTC

In the Linux kernel, the following vulnerability has been resolved:

thermal/drivers/cpufreq_cooling: Fix slab OOB issue

The Linux kernel CVE team has assigned CVE-2020-36776 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/20240227184057.2368370-1-gregkh@linuxfoundation.org/T/#u

Comment 1 Mauro Matteo Cascella 2024-02-28 21:35:59 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2266749]

Comment 5 Justin M. Forbes 2024-03-01 22:43:43 UTC

This was fixed for Fedora with the 5.11.20 stable kernel updates.

Comment 6 Alex 2024-06-09 17:04:11 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2020-36776 is: CHECK	Maybe valid. Check manually. with impact LOW (that is an approximation based on flags WRITE KASAN OOB  ; these flags parsed automatically based on patch data). Such automatic check happens only for Low/Moderates (and only when not from reporter, but parsing already existing CVE). Highs always checked manually (I check it myself and then we check it again in Remediation team). In rare cases some of the Moderates could be increased to High later.