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NVD / CVE Program· CNA Linux

CVE-2026-90327: phonet: pep: do not write beyond optlen in getsockopt

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 056eea1a2068ad2fb7c3093c5f1095268f87d0c7, 1bf499e438da80455e258049bce60ffb3a53f3fa, 6054fed6bad08b6d03973e8ffca7f0c9394d1c30; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 056eea1a2068ad2fb7c3093c5f1095268f87d0c7, 1bf499e438da80455e258049bce60ffb3a53f3fa, 6054fed6bad08b6d03973e8ffca7f0c9394d1c30; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: phonet: pep: do not write beyond optlen in getsockopt pep_getsockopt() clamps the reported length to the caller's buffer with min_t(), but then stores the value with put_user(val, (int __user *) optval), which always writes sizeof(int) bytes. A getsockopt() call with an optlen smaller than sizeof(int) thus reports the clamped length yet writes a full int, one to three bytes past the user buffer. Write the value with copy_to_user() bounded by len, so at most optlen bytes are copied, matching the length reported back to userspace.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • No public exploit code on record
  • A fix has been released

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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.

—

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

    • 2.6.28affected
    • 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and later · before 6054fed6bad08b6d03973e8ffca7f0c9394d1c30affected · git
    • 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and later · before eac733a0b6fe0a52d91f9f623425735ed50ac6c2affected · git
    • 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and later · before 95e0ed2439dd1792eb454c68ae8d10f30ffe3bffaffected · git
    • 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and later · before 056eea1a2068ad2fb7c3093c5f1095268f87d0c7affected · git
    • 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and later · before 1bf499e438da80455e258049bce60ffb3a53f3faaffected · git
    • 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and later · before c4487e4d5309de587479ecc2f5173b49586f46f4affected · git
    • 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and later · before f97022fefe6eb06ee18549d603420440f2959802affected · git
    • 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and later · before 77e5eb0e192aec6710c03ca8144582fd2af36ca4affected · git
    • before 2.6.28not affected · semver

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:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90325Sep 17, 2026 · blk-cgroup: skip dying blkg in blkcg_activate_policy()
    31Monitor
  • ← EarlierCVE-2026-90326Sep 17, 2026 · blk-cgroup: fix race between policy activation and blkg destruction
    31Monitor
  • Later →CVE-2026-90328Sep 17, 2026 · HID: steam: Reject short reads
    0Monitor

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 Linux056eea1a2068ad2fb7c3093c5f1095268f87d0c7Vendor (CNA)
Linux Linux1bf499e438da80455e258049bce60ffb3a53f3faVendor (CNA)
Linux Linux6054fed6bad08b6d03973e8ffca7f0c9394d1c30Vendor (CNA)
Linux Linux77e5eb0e192aec6710c03ca8144582fd2af36ca4Vendor (CNA)
Linux Linux95e0ed2439dd1792eb454c68ae8d10f30ffe3bffVendor (CNA)
Linux Linuxc4487e4d5309de587479ecc2f5173b49586f46f4Vendor (CNA)
Linux Linuxeac733a0b6fe0a52d91f9f623425735ed50ac6c2Vendor (CNA)
Linux Linuxf97022fefe6eb06ee18549d603420440f2959802Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

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

All records