VulnerabilityPublished 8 May 2026Updated 6 Nov 2026

CVE-2026-43394: Linux kernel · nfsd: Fix cred ref leak in nfsd_nl_listener_set_doit().

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in cba413765376bb466035c9160fa3130402971e2c : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in cba413765376bb466035c9160fa3130402971e2c, 92978c83bb4eef55d02a6c990c01c423131eefa7, 019debe5851d7355bea9ff0248cc317878924d8f +1

Exploitation evidence

Disclosed: evidence found.
CVE published 8 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to cba413765376bb466035c9160fa3130402971e2c, 92978c83bb4eef55d02a6c990c01c423131eefa7, 019debe5851d7355bea9ff0248cc317878924d8f or 02e87ec0bc706cb93fa47b43d18c4d10102c7d54.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 16a471177496c8e04a9793812c187a2c1a2192fa, < cba413765376bb466035c9160fa3130402971e2c	Fixed in cba413765376bb466035c9160fa3130402971e2c
LinuxLinux	Affected ≥ 16a471177496c8e04a9793812c187a2c1a2192fa, < 92978c83bb4eef55d02a6c990c01c423131eefa7	Fixed in 92978c83bb4eef55d02a6c990c01c423131eefa7
LinuxLinux	Affected ≥ 16a471177496c8e04a9793812c187a2c1a2192fa, < 019debe5851d7355bea9ff0248cc317878924d8f	Fixed in 019debe5851d7355bea9ff0248cc317878924d8f
LinuxLinux	Affected ≥ 16a471177496c8e04a9793812c187a2c1a2192fa, < 02e87ec0bc706cb93fa47b43d18c4d10102c7d54	Fixed in 02e87ec0bc706cb93fa47b43d18c4d10102c7d54
LinuxLinux	Affected =6.10	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: Fix cred ref leak in nfsd_nl_listener_set_doit(). nfsd_nl_listener_set_doit() uses get_current_cred() without put_cred(). As we can see from other callers, svc_xprt_create_from_sa() does not require the extra refcount. nfsd_nl_listener_set_doit() is always in the process context, sendmsg(), and current->cred does not go away. Let's use current_cred() in nfsd_nl_listener_set_doit().

References

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