CVE-2021-34693

MEDIUMNVD 5.55.5—

5.5

net/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.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 16.5%
KEV: Not listed

Published

June 14, 2021

Last Modified

November 21, 2024

References (14)

cve@mitrehttp://www.openwall.com/lists/oss-security/2021/06/15/1
cve@mitrehttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5e87ddbe3942e27e939bdc02deb8579b0cbd8ecc
cve@mitrehttps://lists.debian.org/debian-lts-announce/2021/07/msg00014.html
cve@mitrehttps://lists.debian.org/debian-lts-announce/2021/07/msg00015.html
cve@mitrehttps://lists.debian.org/debian-lts-announce/2021/07/msg00016.html
cve@mitrehttps://lore.kernel.org/netdev/trinity-87eaea25-2a7d-4aa9-92a5-269b822e5d95-1623609211076%403c-app-gmx-bs04/T/
cve@mitrehttps://www.debian.org/security/2021/dsa-4941
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/06/15/1
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5e87ddbe3942e27e939bdc02deb8579b0cbd8ecc
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2021/07/msg00014.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2021/07/msg00016.html
af854a3a-2127-422b-91ae-364da2661108https://lore.kernel.org/netdev/trinity-87eaea25-2a7d-4aa9-92a5-269b822e5d95-1623609211076%403c-app-gmx-bs04/T/
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2021/dsa-4941

Patch Availability(7)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-image-virtual-hwe-18.04-edge (5.4.0.81.91~18.04.73) @ bionic	2026-05-26	ubuntu
ubuntu	linux-virtual-hwe-16.04-edge (4.15.0.156.149) @ xenial	2026-05-26	ubuntu
ubuntu	linux-tools-gke (4.15.0.1108.109) @ xenial	2026-05-26	ubuntu
ubuntu	linux-image-lowlatency (4.4.0.219.226) @ xenial	2026-05-26	ubuntu
ubuntu	linux-image-lowlatency (5.11.0.34.36) @ hirsute	2026-05-26	ubuntu
ubuntu	linux-image-raspi2 (4.15.0.1095.93) @ bionic	2026-05-26	ubuntu
ubuntu	linux-image-lowlatency (4.4.0.222.229) @ xenial	2026-05-26	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-909

All Vendor Advisories

(8)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 14:55 UTCEG score recompute
2026-05-26 14:55 UTCVendor advisory
2026-05-26 14:55 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-34693?

CVE-2021-34693 is a medium vulnerability published on June 14, 2021. net/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.

When was CVE-2021-34693 disclosed?

CVE-2021-34693 was first published in the National Vulnerability Database on June 14, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-34693 actively exploited?

CVE-2021-34693 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-34693?

CVE-2021-34693 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-34693?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-34693, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-34693

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