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Vulnerabilities

Vulnerability · CVE-2026-3038

The rtsock_msg_buffer() function serializes routing information into a buffer.

Published Mar 9, 2026 · catalog updated Jun 17, 2026 · The rtsock_msg_buffer() function serializes

Check if you run it

No confirmed exploitation is on record for CVE-2026-3038. EPSS is 0.45%. Act only if a listed version of The rtsock_msg_buffer() function serializes is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The rtsock_msg_buffer() function serializes).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.45%
Remediation
Advisory link
Affected products
cpe freebsd/freebsd

The rtsock_msg_buffer() function serializes routing information into a buffer. As a part of this, it copies sockaddr structures into a sockaddr_storage structure on the stack. It assumes that the source sockaddr length field had already been validated, but this is not necessarily the case, and it's possible for a malicious userspace program to craft a request which triggers a 127-byte overflow. In practice, this overflow immediately overwrites the canary for the rtsock_msg_buffer() stack frame, resulting in a panic once the function returns. The bug allows an unprivileged user to crash the kernel by triggering a stack buffer overflow in rtsock_msg_buffer(). In particular, the overflow will corrupt a stack canary value that is verified when the function returns; this mitigates the impact of the stack overflow by triggering a kernel panic. Other kernel bugs may exist which allow userspace to find the canary value and thus defeat the mitigation, at which point local privilege escalation may be possible.

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 freebsd/freebsd13.5

How to fix CVE-2026-3038

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-2026-3038. EPSS is 0.45%. Act only if a listed version of The rtsock_msg_buffer() function serializes is installed.

Which versions are affected?

Compare what you have installed with 13.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 0.45%. 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. Mar 9, 2026 · NIST NVD

    Detected

    The rtsock_msg_buffer() function serializes routing information into a buffer. As a part of this, it copies sockaddr structures into a sockaddr_storage structure on the stack. It assumes that the source sockaddr length field had already been validated, but this is not necessarily the case, and it's possible for a malicious userspace program to craft a request which triggers a 127-byte overflow. In

  2. Jun 17, 2026 · NIST NVD

    Updated

    The rtsock_msg_buffer() function serializes routing information into a buffer. As a part of this, it copies sockaddr structures into a sockaddr_storage structure on the stack. It assumes that the source sockaddr length field had already been validated, but this is not necessarily the case, and it's possible for a malicious userspace program to craft a request which triggers a 127-byte overflow. In

Sources

  • CVE.orgVulnerability recordCVE-2026-3038

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-3038

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-3038

    The rtsock_msg_buffer() function serializes routing information into a buffer. As a part of this, it copies sockaddr structures into a sockaddr_storage structure on the stack. It assumes that the source sockaddr length field had already been validated, but this is not necessari

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.