CVE-2021-47179

2024-03-2500:00:00

ubuntu.com

linux kernel vulnerability

nfsv4

null pointer dereference

pnfs_mark_matching_lsegs_return

oops

connectathon basic tests

nfs v4.1

nfs v4.2

ontap

CVSS3

5.5

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

6.5

Confidence

High

EPSS

Percentile

5.1%

JSON

In the Linux kernel, the following vulnerability has been resolved: NFSv4:
Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return() Commit
de144ff4234f changes _pnfs_return_layout() to call
pnfs_mark_matching_lsegs_return() passing NULL as the struct
pnfs_layout_range argument. Unfortunately,
pnfs_mark_matching_lsegs_return() doesn’t check if we have a value here
before dereferencing it, causing an oops. I’m able to hit this crash
consistently when running connectathon basic tests on NFS v4.1/v4.2 against
Ontap.

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchlinux< anyUNKNOWN
ubuntu20.04noarchlinux-aws< anyUNKNOWN
ubuntu18.04noarchlinux-aws-5.4< anyUNKNOWN
ubuntu20.04noarchlinux-azure< anyUNKNOWN
ubuntu18.04noarchlinux-azure-5.4< anyUNKNOWN
ubuntu20.04noarchlinux-bluefield< anyUNKNOWN
ubuntu20.04noarchlinux-gcp< anyUNKNOWN
ubuntu18.04noarchlinux-gcp-5.4< anyUNKNOWN
ubuntu20.04noarchlinux-gkeop< anyUNKNOWN
ubuntu18.04noarchlinux-hwe-5.4< anyUNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	20.04	noarch	linux	< any	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< any	UNKNOWN
ubuntu	18.04	noarch	linux-aws-5.4	< any	UNKNOWN
ubuntu	20.04	noarch	linux-azure	< any	UNKNOWN
ubuntu	18.04	noarch	linux-azure-5.4	< any	UNKNOWN
ubuntu	20.04	noarch	linux-bluefield	< any	UNKNOWN
ubuntu	20.04	noarch	linux-gcp	< any	UNKNOWN
ubuntu	18.04	noarch	linux-gcp-5.4	< any	UNKNOWN
ubuntu	20.04	noarch	linux-gkeop	< any	UNKNOWN
ubuntu	18.04	noarch	linux-hwe-5.4	< any	UNKNOWN