CVE-2020-11565

medium

Published 2020-11-03 · Modified 2020-11-04

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CVSS v3

—

CVSS v4 NEW

—

not yet in upstream

VIR risk

5.5

Description

An issue was discovered in the Linux kernel through 5.6.2. mpol_parse_str in mm/mempolicy.c has a stack-based out-of-bounds write because an empty nodelist is mishandled during mount option parsing, aka CID-aa9f7d5172fa. NOTE: Someone in the security community disagrees that this is a vulnerability because the issue “is a bug in parsing mount options which can only be specified by a privileged user, so triggering the bug does not grant any powers not already held.”

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Red Hat Errata — Red Hat Inc. · View original ↗ · Open-Errata-API

Description kernel: out-of-bounds write in mpol_parse_str function in mm/mempolicy.c Red Hat statement Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. CVSS v3: 6.0 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H)…

Workaround

for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Description

kernel: out-of-bounds write in mpol_parse_str function in mm/mempolicy.c

Red Hat statement

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

CVSS v3: 6.0 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H)

Errata / fixed releases

Product	Package	Advisory	Released
Red Hat Enterprise Linux 7	`kernel-rt-0:3.10.0-1160.rt56.1131.el7`	RHSA-2020:4062	2020-09-29T00:00:00Z
Red Hat Enterprise Linux 7	`kernel-alt-0:4.14.0-115.26.1.el7a`	RHSA-2020:2854	2020-07-07T00:00:00Z
Red Hat Enterprise Linux 7	`kernel-0:3.10.0-1160.el7`	RHSA-2020:4060	2020-09-29T00:00:00Z
Red Hat Enterprise Linux 8	`kernel-rt-0:4.18.0-240.rt7.54.el8`	RHSA-2020:4609	2020-11-04T00:00:00Z
Red Hat Enterprise Linux 8	`kernel-0:4.18.0-240.el8`	RHSA-2020:4431	2020-11-04T00:00:00Z

Package state

Product	Package	State
Red Hat Enterprise Linux 5	`kernel`	Not affected
Red Hat Enterprise Linux 6	`kernel`	Out of support scope
Red Hat Enterprise MRG 2	`kernel-rt`	Out of support scope

Apply commands

bash fix

Apply RHSA-2020:4062 for Red Hat Enterprise Linux 7

yum update -y kernel-rt
# or:
dnf upgrade -y kernel-rt

Affected

Vendor	Product	Version
redhat	Red Hat Enterprise Linux 5	`Not affected`

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

AlmaLinux Fixed 1 release

Version	Status	Fixed in
8	Fixed	`kernel-tools-libs-devel-4.18.0-240.el8.x86_64.rpm`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`5.5.17-1`
sid	Fixed	`5.5.17-1`
forky	Fixed	`5.5.17-1`
bullseye	Fixed	`5.5.17-1`
bookworm	Fixed	`5.5.17-1`

Red Hat Fixed 1 release

Version	Status	Fixed in
8	Fixed	—

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.