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Vulnerabilities

Vulnerability · CVE-2023-3773

A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem).

Published Jul 25, 2023 · catalog updated Oct 14, 2026 · Red Hat Red Hat Enterprise Linux 9

Check if you run it

No confirmed exploitation is on record for CVE-2023-3773. EPSS is 0.25%. Act only if a listed version of Red Hat Red Hat Enterprise Linux 9 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.25%
Remediation
Advisory link
Affected products
cpe debian/debian linux · cpe fedoraproject/fedora · cpe linux/linux kernel · cpe redhat/enterprise linux · vendor Red Hat Red Hat Enterprise Linux 6 · vendor Red Hat Red Hat Enterprise Linux 7

A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when parsing netlink attributes, leading to potential leakage of sensitive heap data to userspace.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe debian/debian linux10.0
  • cpe debian/debian linux12.0
  • cpe fedoraproject/fedoraversion unspecified
  • cpe linux/linux kernelversion unspecified
  • cpe redhat/enterprise linux8.0
  • cpe redhat/enterprise linux9.0
  • vendor Red Hat Red Hat Enterprise Linux 6version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 7version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 8version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 9version unspecified

How to fix CVE-2023-3773

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2023-3773. EPSS is 0.25%. Act only if a listed version of Red Hat Red Hat Enterprise Linux 9 is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 10.0; debian/debian linux 12.0; redhat/enterprise linux 8.0; redhat/enterprise linux 9.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read. EPSS 0.25%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 25, 2023 · NIST NVD

    Detected

    A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when parsing netlink attributes, leading to potential leakage of sensitive heap data to userspace.

  2. Oct 14, 2026 · NIST NVD

    Updated

    A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when parsing netlink attributes, leading to potential leakage of sensitive heap data to userspace.

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2023-3773

    A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when parsing netlink attributes, leading to potential lea

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2023-3773

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-3773

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2023-3773

    A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when parsing netlink attributes, leading to potential lea

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.