CVE-2021-34693

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Summary

CVECVE-2021-34693
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-06-14 22:15:20 UTC
Updated2026-10-08 21:17:36 UTC
Descriptionnet/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.004720000 probability, percentile 0.389310000 (date 2026-10-10)

Problem Types: CWE-909 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.0[email protected]Primary2.1AV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS v3.1 Breakdown

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

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

CVSS v2.0 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 10.0 All All All
Operating System Debian Debian Linux 9.0 All All All
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
[SECURITY] [DLA 2713-1] linux security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
oss-security - CVE-2021-34693: Infoleak in CAN BCM protocol in Linux kernel af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Exploit, Mailing List, Patch, Third Party Advisory
[PATCH] can: bcm: fix infoleak in struct bcm_msg_head af854a3a-2127-422b-91ae-364da2661108 lore.kernel.org
[SECURITY] [DLA 2714-1] linux-4.19 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
Debian -- Security Information -- DSA-4941-1 linux af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit af854a3a-2127-422b-91ae-364da2661108 git.kernel.org
[SECURITY] [DLA 2713-2] linux security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
[PATCH] can: bcm: fix infoleak in struct bcm_msg_head MITRE lore.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159380 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2021-9442)
  • 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)
  • 178710 Debian Security Update for linux (DSA 4941-1)
  • 178712 Debian Security Update for linux (DLA 2713-1)
  • 178713 Debian Security Update for linux-4.19 (DLA 2714-1)
  • 178714 Debian Security Update for linux (DLA 2713-2)
  • 179953 Debian Security Update for linux (CVE-2021-34693)
  • 198464 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5045-1)
  • 198491 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5070-1)
  • 198497 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5073-1)
  • 198506 Ubuntu Security Notification for Linux kernel (GCP) Vulnerabilities (USN-5073-2)
  • 198507 Ubuntu Security Notification for Linux kernel (Raspberry Pi) Vulnerabilities (USN-5073-3)
  • 353097 Amazon Linux Security Advisory for kernel : ALAC2012-2021-033
  • 353098 Amazon Linux Security Advisory for kmod-sfc : ALAC2012-2021-034
  • 353099 Amazon Linux Security Advisory for kmod-mlx5 : ALAC2012-2021-035
  • 353147 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2022-004
  • 353158 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.10-2022-002
  • 390219 Oracle Managed Virtualization (VM) Server for x86 Security Update for kernel (OVMSA-2021-0030)
  • 670707 EulerOS Security Update for kernel (EulerOS-SA-2021-2465)
  • 670744 EulerOS Security Update for kernel (EulerOS-SA-2021-2502)
  • 670772 EulerOS Security Update for kernel (EulerOS-SA-2021-2530)
  • 670796 EulerOS Security Update for kernel (EulerOS-SA-2021-2554)
  • 671047 EulerOS Security Update for kernel (EulerOS-SA-2021-2588)
  • 750828 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:2305-1)
  • 750830 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2321-1)
  • 750832 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2324-1)
  • 750842 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:2352-1)
  • 750864 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2421-1)
  • 750868 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2427-1)
  • 750869 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2422-1)
  • 750877 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:2427-1)
  • 750880 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2451-1)
  • 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
  • 901049 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (6567-1)
  • 903698 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (4361)
  • 905973 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (4361-1)

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