Linux kernel llcp_sock_bind/connect use-after-free

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Summary

CVECVE-2021-23134
StatePUBLISHED
Assignerpalo_alto
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-05-12 23:15:07 UTC
Updated2026-07-30 19:36:37 UTC
DescriptionUse After Free vulnerability in nfc sockets in the Linux Kernel before 5.12.4 allows local attackers to elevate their privileges. In typical configurations, the issue can only be triggered by a privileged local user with the CAP_NET_RAW capability.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-416 | CWE-416 CWE-416 Use After Free

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:L/AC:L/Au:N/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Application Netapp Cloud Backup - All All All
Hardware Netapp H300s - All All All
Operating System Netapp H300s Firmware - All All All
Hardware Netapp H410c - All All All
Operating System Netapp H410c Firmware - All All All
Hardware Netapp H410s - All All All
Operating System Netapp H410s Firmware - All All All
Hardware Netapp H500s - All All All
Operating System Netapp H500s Firmware - All All All
Hardware Netapp H700s - All All All
Operating System Netapp H700s Firmware - All All All
Hardware Netapp Solidfire Baseboard Management Controller - All All All
Operating System Netapp Solidfire Baseboard Management Controller Firmware - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Kernel Linux Kernel affected unspecified 5.12.4 custom Not specified

References

ReferenceSourceLinkTags
[SECURITY] Fedora 34 Update: kernel-tools-5.11.20-300.fc34 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org Third Party Advisory
[SECURITY] Fedora 33 Update: kernel-5.11.20-200.fc33 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org Third Party Advisory
CVE-2021-23134 Linux Kernel Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
[SECURITY] [DLA 2689-1] linux security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
kernel/git/netdev/net.git - Netdev Group's networking tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch, Vendor Advisory
oss-security - CVE-2021-23134: Linux kernel: UAF in nfc sockets af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Patch, Third Party Advisory
[SECURITY] [DLA 2690-1] linux-4.19 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
[SECURITY] Fedora 33 Update: kernel-5.11.20-200.fc33 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
FEDORA:FEDORA-2021-286375de1e MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Nadav Markus from Palo Alto Networks (en)

CNA: Or Cohen from Palo Alto Networks (en)

Additional Advisory Data

Solutions

CNA: Apply the following patch: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=c61760e6940d

Legacy QID Mappings

  • 159338 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2021-9404)
  • 159339 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel-container (ELSA-2021-9406)
  • 159399 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2021-9452)
  • 159400 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel-container (ELSA-2021-9453)
  • 178679 Debian Security Update for linux-4.19 (DLA 2690-1)
  • 178680 Debian Security Update for linux (DLA 2689-1)
  • 180133 Debian Security Update for linux (CVE-2021-23134)
  • 198416 Ubuntu Security Notification for Linux kernel vulnerabilities (USN-4997-1)
  • 198418 Ubuntu Security Notification for Linux kernel vulnerabilities (USN-5000-1)
  • 198419 Ubuntu Security Notification for Linux kernel (OEM) vulnerabilities (USN-5001-1)
  • 198425 Ubuntu Security Notification for Linux kernel (KVM) vulnerabilities (USN-5000-2)
  • 198426 Ubuntu Security Notification for Linux kernel (KVM) vulnerabilities (USN-4997-2)
  • 198437 Ubuntu Security Notification for Linux kernel vulnerabilities (USN-5016-1) (Sequoia)
  • 198459 Ubuntu Security Notification for Linux, Linux-aws, Linux-aws-hwe, Linux-azure, Linux-azure-4.15, Linux-gcp, (USN-5018-1)
  • 281159 Fedora Security Update for kernel (FEDORA-2021-05152dbcf5)
  • 281160 Fedora Security Update for kernel (FEDORA-2021-286375de1e)
  • 610384 Google Pixel Android December 2021 Security Patch Missing
  • 610392 Google Android January 2022 Security Patch Missing for Huawei EMUI
  • 670488 EulerOS Security Update for kernel (EulerOS-SA-2021-2246)
  • 670514 EulerOS Security Update for kernel (EulerOS-SA-2021-2272)
  • 670578 EulerOS Security Update for kernel (EulerOS-SA-2021-2336)
  • 670634 EulerOS Security Update for kernel (EulerOS-SA-2021-2392)
  • 750117 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1891-1)
  • 750118 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1890-1)
  • 750121 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1888-1)
  • 750125 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1887-1)
  • 750126 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1889-1)
  • 750139 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1913-1)
  • 750140 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1912-1)
  • 750171 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:0843-1)
  • 750650 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1975-1)
  • 750652 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1977-1)
  • 750673 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 17 for SLE 12 SP5) (SUSE-SU-2021:2067-1)
  • 750674 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 18 for SLE 12 SP5) (SUSE-SU-2021:2020-1)
  • 750676 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 13 for SLE 15 SP2) (SUSE-SU-2021:2027-1)
  • 750678 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 24 for SLE 15) (SUSE-SU-2021:2057-1)
  • 750741 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:0947-1)
  • 750762 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:1977-1)
  • 750766 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:1975-1)
  • 750864 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2421-1)
  • 750880 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2451-1)
  • 751688 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 37 for SLE 12 SP3) (SUSE-SU-2022:0325-1)
  • 751689 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 39 for SLE 12 SP3) (SUSE-SU-2022:0327-1)
  • 753087 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 22 for SLE 15) (SUSE-SU-2022:0255-1)
  • 753211 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 11 for SLE 15 SP2) (SUSE-SU-2022:0291-1)
  • 753257 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 23 for SLE 15) (SUSE-SU-2022:0243-1)
  • 753272 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 16 for SLE 12 SP5) (SUSE-SU-2022:0234-1)
  • 753292 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 0 for SLE 15 SP3) (SUSE-SU-2022:0293-1)
  • 753408 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 15 for SLE 12 SP5) (SUSE-SU-2022:0263-1)
  • 900096 CBL-Mariner Linux Security Update for kernel 5.10.52.1
  • 900304 CBL-Mariner Linux Security Update for kernel 5.10.57.1
  • 900319 CBL-Mariner Linux Security Update for kernel 5.10.60.1
  • 901278 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (6531-1)
  • 902883 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (4200)
  • 906035 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (4200-1)

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