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NVD / CVE Program· CNA Linux

CVE-2026-43088: net: af_key: zero aligned sockaddr tail in PF_KEY exports

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 11cbf294bac623bd57296f231199193087f57b4a, 2e74f974359b5382ecbe8536abbb5b837eb6c724, 3c19cb8a84ef709d57943bd6664cf31cb91ba6ec.

Low priority for now. Upgrade to Linux Linux 11cbf294bac623bd57296f231199193087f57b4a, 2e74f974359b5382ecbe8536abbb5b837eb6c724, 3c19cb8a84ef709d57943bd6664cf31cb91ba6ec or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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 `pfkey_sockaddr_size()` when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, `pfkey_sockaddr_fill()` initializes only the first 28 bytes of `struct sockaddr_in6`, 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 `skb_put()`: - `SADB_ACQUIRE` - `SADB_X_NAT_T_NEW_MAPPING` - `SADB_X_MIGRATE` Fix those paths by clearing only the aligned sockaddr tail after `pfkey_sockaddr_fill()`.

Published
May 6, 2026
Updated
Nov 11, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-43088

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 6df5f90175fe4c584e9960b6c00131a7bf2b5399affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 746ee79d9e140f0e9e56f5123eaa88ad9332de7baffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before e357c3cf8a44d4ec1f49ad6981e4ab9704354347affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 3c19cb8a84ef709d57943bd6664cf31cb91ba6ecaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 11cbf294bac623bd57296f231199193087f57b4aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before edd446ee7cd3d02cac246168063d5b3e9ea68460affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 2e74f974359b5382ecbe8536abbb5b837eb6c724affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 426c355742f02cf743b347d9d7dbdc1bfbfa31efaffected · git
    • before 2.6.12not affected · semver
Affected versions · NVD (5)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.12.1 and later · before 6.12.88
  • linux linux kernel6.13 and later · before 6.18.30
  • linux linux kernel6.19 and later · before 6.19.14
  • linux linux kernel2.6.12
  • linux linux kernel7.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:13linuxbefore 6.12.88-16.12.88-1
Debian:14linuxbefore 6.19.14-16.19.14-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-43084May 6, 2026 · netfilter: nfnetlink_queue: make hash table per queue
    31Monitor
  • ← EarlierCVE-2026-43085May 6, 2026 · netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator
    22Monitor
  • Later →CVE-2026-43089May 6, 2026 · xfrm_user: fix info leak in build_mapping()
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux11cbf294bac623bd57296f231199193087f57b4aVendor (CNA)
Linux Linux2e74f974359b5382ecbe8536abbb5b837eb6c724Vendor (CNA)
Linux Linux3c19cb8a84ef709d57943bd6664cf31cb91ba6ecVendor (CNA)
Linux Linux426c355742f02cf743b347d9d7dbdc1bfbfa31efVendor (CNA)
Linux Linux6df5f90175fe4c584e9960b6c00131a7bf2b5399Vendor (CNA)
Linux Linux746ee79d9e140f0e9e56f5123eaa88ad9332de7bVendor (CNA)
Linux Linuxe357c3cf8a44d4ec1f49ad6981e4ab9704354347Vendor (CNA)
Linux Linuxedd446ee7cd3d02cac246168063d5b3e9ea68460Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.88-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records