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NVD / CVE Program· CNA Linux

CVE-2026-89539: SUNRPC: reject duplicate CREDS_VALUE options

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 2e4ce62385c1b8a887c5370af058ac7b52a8eaf9, 4904d61eb2e2bd484000725fd302b8f37b4fcf3a, 4b5ebb4f91a6152a0f7b1253f701197e5710d4da; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2e4ce62385c1b8a887c5370af058ac7b52a8eaf9, 4904d61eb2e2bd484000725fd302b8f37b4fcf3a, 4b5ebb4f91a6152a0f7b1253f701197e5710d4da; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1 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: SUNRPC: reject duplicate CREDS_VALUE options gssx_dec_option_array() walks the wire-supplied option array and, for every entry whose name matches CREDS_VALUE, calls gssx_dec_linux_creds() on the same struct svc_cred. That helper unconditionally installs a fresh groups_alloc() result into creds->cr_group_info without releasing whatever pointer was already there: for (i = 0; i < count; i++) { ... decode name ... if (length == sizeof(CREDS_VALUE) && memcmp(p, CREDS_VALUE, sizeof(CREDS_VALUE)) == 0) { err = gssx_dec_linux_creds(xdr, creds); ... } } A reply that carries two CREDS_VALUE entries therefore overwrites cr_group_info on the second iteration and orphans the group_info allocated by the first call. The earlier free_creds path only releases the last cr_group_info via free_svc_cred(), so the first allocation's refcount stays at one and its kvmalloc-backed storage is leaked. No in-tree caller of gssp_accept_sec_context_upcall() expects more than one CREDS_VALUE per reply. Fix by tracking whether a CREDS_VALUE option has already been decoded and returning -EINVAL on any subsequent match, so the free_creds path releases the single group_info that was installed.

—No exploit Fix available
Published
Sep 11, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 11th 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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Noroxi analysis

What does it mean in your environment?

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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

    • 3.10affected
    • 1d658336b05f8697d6445834f8867f8ad5e4f735 and later · before 6207d7df96b3a7f507f0bfc8842b3760ee2fb1f8affected · git
    • 1d658336b05f8697d6445834f8867f8ad5e4f735 and later · before 4904d61eb2e2bd484000725fd302b8f37b4fcf3aaffected · git
    • 1d658336b05f8697d6445834f8867f8ad5e4f735 and later · before 64b9ef369a6f723294613cb129e5f62c35429df5affected · git
    • 1d658336b05f8697d6445834f8867f8ad5e4f735 and later · before 4b5ebb4f91a6152a0f7b1253f701197e5710d4daaffected · git
    • 1d658336b05f8697d6445834f8867f8ad5e4f735 and later · before f615b884310bf82d0014e3b5a92eb9aa88146685affected · git
    • 1d658336b05f8697d6445834f8867f8ad5e4f735 and later · before 7a1d0501cbb962beba23377035d667bf3c1726eeaffected · git
    • 1d658336b05f8697d6445834f8867f8ad5e4f735 and later · before 9d94f046b23de0f77849ea69133063c949297e30affected · git
    • 1d658336b05f8697d6445834f8867f8ad5e4f735 and later · before 2e4ce62385c1b8a887c5370af058ac7b52a8eaf9affected · git
    • before 3.10not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
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-2026-89537Sep 11, 2026 · SUNRPC: Reject short RFC 4121 MIC tokens in gss_krb5_verify_mic_v2
    36Monitor
  • ← EarlierCVE-2026-89538Sep 11, 2026 · SUNRPC: Reject krb5 v2 wrap tokens with oversized ec field
    39Monitor
  • Later →CVE-2026-89540Sep 11, 2026 · sunrpc: init gssp_lock before publishing proc entry
    31Monitor

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 Linux2e4ce62385c1b8a887c5370af058ac7b52a8eaf9Vendor (CNA)
Linux Linux4904d61eb2e2bd484000725fd302b8f37b4fcf3aVendor (CNA)
Linux Linux4b5ebb4f91a6152a0f7b1253f701197e5710d4daVendor (CNA)
Linux Linux6207d7df96b3a7f507f0bfc8842b3760ee2fb1f8Vendor (CNA)
Linux Linux64b9ef369a6f723294613cb129e5f62c35429df5Vendor (CNA)
Linux Linux7a1d0501cbb962beba23377035d667bf3c1726eeVendor (CNA)
Linux Linux9d94f046b23de0f77849ea69133063c949297e30Vendor (CNA)
Linux Linuxf615b884310bf82d0014e3b5a92eb9aa88146685Vendor (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 3.0—Microsoft (MSRC)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.06.6.161.1-1 · Release NotesMicrosoft (MSRC)
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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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.

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