Home/CVE/A flaw was found in the way memory resources were freed in the unix_stream_recvmsg function in the Linux kernel when a s
CVE

CVE-2021-20265

A flaw was found in the way memory resources were freed in the unix_stream_recvmsg function in the Linux kernel when a s

A flaw was found in the way memory resources were freed in the unix_stream_recvmsg function in the Linux kernel when a signal was pending. This flaw allows an unprivileged local user to crash the system by exhausting available memory. The highest threat from this vulnerability is to system availability.

MEDIUM · CVSS 5.5 EPSS 0.0004
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-400Uncontrolled Resource Consumption
CWE-401Missing Release of Memory after Effective Lifetime
▤

Affected Products & Versions

2
linux kernelall versions
oracle tekelec platform distribution>= 7.4.0 and <= 7.7.1
▣

Scoring & Timeline

5.5
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Mar 2021 · 04:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

7
suse-csafSUSE-SU-2021:3929-1
suse-csafSUSE-SU-2021:3935-1
suse-csafSUSE-SU-2021:14849-1
rhsaRHSA-2021:1288Important
rhsaRHSA-2021:0856Important
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=1908827Issue TrackingPatchThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fa0dc04df259ba2df3ce1920e9690c7842f8fa4bPatchVendor Advisory
https://www.oracle.com/security-alerts/cpuoct2021.htmlPatchThird Party Advisory
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