CVE-2021-3759
memory overflow vulnerability was found in the Linux kernel’s ipc functionality of the memcg subsystem, in the way a user calls the semget function multiple times, creating semaphores
CVE-2021-3759: memory overflow vulnerability was found in the Linux kernel’s ipc functionality of the memcg subsystem, in the way a user calls the semget…
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
CVE-2021-3759 at a glance
- CISA KEV
- Not listed (catalog checked )
- Highest advisory severity
- Medium
- CVSS base score
- 5.5 (Red Hat)
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H(Red Hat)
- Weakness
- CWE-770
- Fixed releases
- Red Hat: kernel-rt-0:4.18.0-372.9.1.rt7.166.el8, kernel-0:4.18.0-372.9.1.el8, RHSA-2022:1975, RHSA-2022:1988
- Vendor advisories
- 1 from Red Hat
- VulniPulse record
- Published
Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2021-3759; bulletin-wide values are not repeated here.
Is CVE-2021-3759 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2021-3759 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2021-3759?
Upgrade to a fixed release named by the vendor:
- Red Hat: kernel-rt-0:4.18.0-372.9.1.rt7.166.el8, kernel-0:4.18.0-372.9.1.el8, RHSA-2022:1975, RHSA-2022:1988
- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (Red Hat)
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityMedium5.5
Medium [CVE-2021-3759] memory overflow vulnerability was found in the Linux kernel’s ipc functionality of the memcg subsystem, in the way a user calls the semget function multiple times, creating semaphores
CVE-2021-3759Source published Source updated
A memory overflow vulnerability was found in the Linux kernel’s ipc functionality of the memcg subsystem, in the way a user calls the semget function multiple times, creating semaphores. This flaw allows a local user to starve the resources, causing a denial of service. The highest threat from this vulnerability is to system availability. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770. Affected Red Hat products: Red Hat Enterprise Linux 8. Red Hat fixing advisory: RHSA-2022:1975, RHSA-2022:1988. Affected products named by the advisory: Red Hat package: kernel-rt.
- Affected products in this advisory
- Red Hat Enterprise Linux 8
- Red Hat package: kernel-rt
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- kernel-rt-0:4.18.0-372.9.1.rt7.166.el8
- kernel-0:4.18.0-372.9.1.el8
- RHSA-2022:1975
- RHSA-2022:1988
- Mitigation guidance
- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
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