CVE-2021-47179

Medium

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.

Package Linux Kernel
Published 2024-03-25
Last modified 2024-11-21
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

5.5

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-476

CVE-2021-47179 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.11.20, 4.9.269, 4.14.233, 4.19.191, 5.4.118, 5.10.36, 5.12.3 and later are affected. Fixed in 5.12, 4.9.271, 4.14.235, 4.19.193, 5.4.124, 5.10.42, 5.12.9 and their respective stable series.

Affected from
≥ 5.11.20 ≥ 4.9.269 ≥ 4.14.233 ≥ 4.19.191 ≥ 5.4.118 ≥ 5.10.36 ≥ 5.12.3
Fixed in
✓ 5.12 5.12.x ✓ 4.9.271 4.9.x ✓ 4.14.235 4.14.x ✓ 4.19.193 4.19.x ✓ 5.4.124 5.4.x ✓ 5.10.42 5.10.x ✓ 5.12.9 5.12.x

References

7 total
Showing 5 of 7 references View all on NVD

Frequently asked questions

  • What is CVE-2021-47179?

    CVE-2021-47179 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 5.11.20 onward and has been patched in 5.12, 4.9.271, 4.14.235 and others. CVE-2021-47179 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-47179?

    CVE-2021-47179 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H .

  • Is there a patch available for CVE-2021-47179?

    Yes. CVE-2021-47179 has been patched. Fixed versions include 5.12, 4.9.271, 4.14.235 and others. If you are running Linux kernel 5.11.20 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2021-47179 actively exploited?

    No. CVE-2021-47179 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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