VulnerabilityPublished 27 Jul 2026Updated 7 Sep 2026

CVE-2026-64519: Linux kernel · NFSD: Fix infinite loop in layout state revocation

Affects Linux kernelSource GCVE Database

Not known to be exploited · fixed in 7.0.0-1010.10 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 7.0.0-1010.10, 7.0.0-1009.9, 7.0.0-1008.8 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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.

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What to do

Upgrade Linux kernel to 7.0.0-1010.10, 7.0.0-1009.9, 7.0.0-1008.8 or 7.0.0-28.28.

Affected software

Product	Affected	Fixed in
linux-hwe-edge	Affected <7.0.0-28.28 <7.0.0-1009.9 <7.0.0-1010.10 <7.0.0-1008.8	Fixed in 7.0.0-28.28 7.0.0-1009.9 7.0.0-1010.10 7.0.0-1008.8

AI-suggested

A patch is available and included in Linux kernel versions 7.0.0 and later. Users should update their Linux kernel packages to the fixed versions as provided by their distribution vendor, such as Ubuntu's linux-image packages version 7.0.0-28.28 and later. After updating, a system reboot is required to apply the fix. Due to ABI changes, third-party kernel modules must be recompiled and reinstalled. No additional mitigation steps are necessary beyond applying the official update.

Description

A vulnerability in the Linux kernel's NFS server daemon (NFSD) caused an infinite loop during layout state revocation due to improper handling of state IDs (stids). This flaw was fixed in Linux kernel versions 7.0.0 and later. The issue could cause the revoker to hang indefinitely, impacting system stability. The vulnerability is rated medium severity. Multiple Linux kernel subsystems had security issues fixed in the same update. Users should update to the fixed kernel versions to resolve this and other vulnerabilities.

Impact

The vulnerability causes the NFS server daemon's layout state revocation process to enter an infinite loop, hanging the revoker indefinitely. This can lead to denial of service conditions affecting system stability and availability. No known exploits are reported in the wild. The issue does not directly lead to privilege escalation or data corruption but impacts kernel reliability during NFS operations.

Summary

CVE-2026-64519 addresses an infinite loop vulnerability in the Linux kernel's NFSD component. The function find_one_sb_stid() skips stids with non-zero sc_status, but the SC_TYPE_LAYOUT case in nfsd4_revoke_states() does not set sc_status before calling nfsd4_close_layout(). This causes the retry loop to repeatedly find the same layout stid, resulting in an indefinite hang of the revoker. The issue was resolved by correcting this logic. The fix is included in Linux kernel versions 7.0.0 and later, as distributed by Ubuntu in various kernel packages. This vulnerability is part of a broader set of Linux kernel security fixes released in July and August 2026.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 7 Sep 2026, 17:35 UTC

Technical details

References

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