Bug 1877920 (CVE-2020-25220) - CVE-2020-25220 kernel: use-after-free because skcd->no_refcnt was not considered during the backport of CVE-2020-14356
Summary: CVE-2020-25220 kernel: use-after-free because skcd->no_refcnt was not conside...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-25220
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1877922
Blocks: 1877923
TreeView+ depends on / blocked
 
Reported: 2020-09-10 18:52 UTC by Guilherme de Almeida Suckevicz
Modified: 2020-11-02 08:21 UTC (History)
45 users (show)

Fixed In Version:
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Doc Text:
A flaw was found in the Linux kernel. The cgroups feature is affected by a use-after-free memory flaw that was not considered during the backport for CVE-2020-14356. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Clone Of:
Environment:
Last Closed: 2020-11-02 08:21:17 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2020-09-10 18:52:04 UTC 
The Linux kernel 4.9.x before 4.9.233, 4.14.x before 4.14.194, and 4.19.x before 4.19.140 has a use-after-free because skcd->no_refcnt was not considered during a backport of a CVE-2020-14356 patch. This is related to the cgroups feature.

Reference:
https://bugzilla.redhat.com/show_bug.cgi?id=1868453

Upstream commit:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.14.y&id=82fd2138a5ffd7e0d4320cdb669e115ee976a26e
Comment 1 Guilherme de Almeida Suckevicz 2020-09-10 18:53:18 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1877922]
Comment 2 Justin M. Forbes 2020-09-14 12:55:41 UTC 
Fedora does not support the 4.x LTS releases.
Comment 4 Product Security DevOps Team 2020-11-02 08:21:17 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-25220
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