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Vulnerabilities

Vulnerability · CVE-2026-43088

In the Linux kernel, the following vulnerability has been resolved: net: af_key: zero aligned sockaddr tail in PF_KEY exports PF_KEY export paths use when reserving so…

Published May 6, 2026 · catalog updated Sep 14, 2026 · linux kernel

Check if you run it

No confirmed exploitation is on record for CVE-2026-43088. EPSS is 0.12%. Act only if a listed version of linux kernel 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
0.12%
Remediation
Advisory link
Affected products
cpe linux/linux kernel

In the Linux kernel, the following vulnerability has been resolved: net: af_key: zero aligned sockaddr tail in PF_KEY exports PF_KEY export paths use when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, initializes only the first 28 bytes of , leaving the final 4 aligned bytes uninitialized. Not every PF_KEY message is affected. The state and policy dump builders already zero the whole message buffer before filling the sockaddr payloads. Keep the fix to the export paths that still append aligned sockaddr payloads with plain : - - - Fix those paths by clearing only the aligned sockaddr tail after .

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 linux/linux kernel2.6.12

How to fix CVE-2026-43088

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-2026-43088. EPSS is 0.12%. Act only if a listed version of linux kernel is installed.

Which versions are affected?

Compare what you have installed with linux/linux kernel 2.6.12. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.12%. 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.

Timeline

Detection, updates, and resolution for this record.

  1. May 6, 2026 · NIST NVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: net: af_key: zero aligned sockaddr tail in PF_KEY exports PF_KEY export paths use when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, initializes only the first 28 bytes of , leaving the final 4 aligned bytes uninitialized. Not every PF_KEY message is affected. The state and policy dump b

  2. Sep 14, 2026 · NIST NVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: net: af_key: zero aligned sockaddr tail in PF_KEY exports PF_KEY export paths use when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, initializes only the first 28 bytes of , leaving the final 4 aligned bytes uninitialized. Not every PF_KEY message is affected. The state and policy dump b

Sources

  • CVE.orgVulnerability recordCVE-2026-43088

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-43088

    30-day exploitation probability 0.1%

    first.org
  • NIST NVDVulnerability recordCVE-2026-43088

    In the Linux kernel, the following vulnerability has been resolved: net: af_key: zero aligned sockaddr tail in PF_KEY exports PF_KEY export paths use when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, `pfkey_so

    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.