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NVD / CVE Program· CNA Linux

CVE-2026-45964: SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path

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: 0.16% (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 3b2b6c42070ce4204936288253baf101e995c2d3, 655c9ba9915f05266998dbbf4b76b3c79b8a70aa, a1bc9561b617ec7e2d09e6c134d1db8fcf9ca4a6.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3b2b6c42070ce4204936288253baf101e995c2d3, 655c9ba9915f05266998dbbf4b76b3c79b8a70aa, a1bc9561b617ec7e2d09e6c134d1db8fcf9ca4a6 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: fix gss_auth kref leak in gss_alloc_msg error path Commit 5940d1cf9f42 ("SUNRPC: Rebalance a kref in auth_gss.c") added a kref_get(&gss_auth->kref) call to balance the gss_put_auth() done in gss_release_msg(), but forgot to add a corresponding kref_put() on the error path when kstrdup_const() fails. If service_name is non-NULL and kstrdup_const() fails, the function jumps to err_put_pipe_version which calls put_pipe_version() and kfree(gss_msg), but never releases the gss_auth reference. This leads to a kref leak where the gss_auth structure is never freed. Add a forward declaration for gss_free_callback() and call kref_put() in the err_put_pipe_version error path to properly release the reference taken earlier.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 27, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 5th percentile

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%

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

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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

Affected versions

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

  • linux linux kernel5.2 and later · before 5.10.252
  • linux linux kernel5.11 and later · before 5.15.202
  • linux linux kernel5.16 and later · before 6.1.165
  • linux linux kernel6.2 and later · before 6.6.128
  • linux linux kernel6.7 and later · before 6.12.75
  • linux linux kernel6.13 and later · before 6.18.14
  • linux linux kernel6.19 and later · before 6.19.4

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

    • 5.2affected
    • 5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e and later · before 3b2b6c42070ce4204936288253baf101e995c2d3affected · git
    • 5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e and later · before b559be2ec6cdb2e9c2c36c23fbbd4690d8a5c3f7affected · git
    • 5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e and later · before a1bc9561b617ec7e2d09e6c134d1db8fcf9ca4a6affected · git
    • 5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e and later · before 655c9ba9915f05266998dbbf4b76b3c79b8a70aaaffected · git
    • 5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e and later · before e464e26b2457005c87e158570498274b9f3b90c7affected · git
    • 5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e and later · before c20f925214249bb4fc04f7e197bea142a6438af6affected · git
    • 5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e and later · before a2d4e9a76de0b2178001214ba5de5bf94a7354aaaffected · git
    • 5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e and later · before dd2fdc3504592d85e549c523b054898a036a6afeaffected · git
    • before 5.2not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.18.14-16.18.14-1

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-2026-45962May 27, 2026 · ublk: Validate SQE128 flag before accessing the cmd
    22Monitor
  • ← EarlierCVE-2026-45963May 27, 2026 · ASoC: nau8821: Cancel delayed work on component remove
    22Monitor
  • Later →CVE-2026-45965May 27, 2026 · apparmor: fix invalid deref of rawdata when export_binary is unset
    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 Linux3b2b6c42070ce4204936288253baf101e995c2d3Vendor (CNA)
Linux Linux655c9ba9915f05266998dbbf4b76b3c79b8a70aaVendor (CNA)
Linux Linuxa1bc9561b617ec7e2d09e6c134d1db8fcf9ca4a6Vendor (CNA)
Linux Linuxa2d4e9a76de0b2178001214ba5de5bf94a7354aaVendor (CNA)
Linux Linuxb559be2ec6cdb2e9c2c36c23fbbd4690d8a5c3f7Vendor (CNA)
Linux Linuxc20f925214249bb4fc04f7e197bea142a6438af6Vendor (CNA)
Linux Linuxdd2fdc3504592d85e549c523b054898a036a6afeVendor (CNA)
Linux Linuxe464e26b2457005c87e158570498274b9f3b90c7Vendor (CNA)
debian:linux6.1.170-1 · 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.

No history yet (it accumulates with the daily EPSS job).

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

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)

CWE-401 · Missing Release of Memory after Effective Lifetime

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.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records