CVE Intelligence
Unknown

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

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.

Published Sep 17, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.21%
ahead of 11% of scored CVEs · Oct 18, 2026
Affects
Linux
Linux
CVSS base
—
Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
  2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  3. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Linux Linux ≥ 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and < 6054fed6bad08b6d03973e8ffca7f0c9394d1c30≥ 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and < eac733a0b6fe0a52d91f9f623425735ed50ac6c2≥ 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and < 95e0ed2439dd1792eb454c68ae8d10f30ffe3bff≥ 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and < 056eea1a2068ad2fb7c3093c5f1095268f87d0c7≥ 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and < 1bf499e438da80455e258049bce60ffb3a53f3fa≥ 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and < c4487e4d5309de587479ecc2f5173b49586f46f4≥ 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and < f97022fefe6eb06ee18549d603420440f2959802≥ 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a and < 77e5eb0e192aec6710c03ca8144582fd2af36ca4
and 1 more version 2.6.28
Vulnerable CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 18, 2026 · 3 reading(s) · max 0.21%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Not enough vector or weakness data: use the affected application’s logs as a starting point.
application logs

Timeline

What happened to this CVE, newest first.

  • 2026
  • Record published
    Oct 15, 2026
  • Affected products added · linux/linux
    Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
  • Source status changed · → Received
    Oct 15, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 15, 2026 · NIST National Vulnerability Database
  • CVE published
    Sep 17, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

  • CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 15h
  • CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 15h
  • CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 15h
  • CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 15h
  • CVE-2026-98857 ipvs: bound LBLCR and LBLC cache growth 15h
  • CVE-2026-98858 io_uring: fix task_work add use-after-free with SQPOLL 15h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No CVSS score published by NVD, the CNA, CISA or GitHub so far.
  • No fixed version, patch or mitigation documented.
  • No CISA SSVC assessment.
  • No CWE classification.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-90327 is "phonet: pep: do not write beyond optlen in getsockopt", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.21% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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