VulnerabilityPublished 15 Aug 2026Updated 21 Oct 2026

CVE-2026-74386: Linux kernel · nvmet-tcp: fix page fragment cache leak in error path

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in fc11e3f0daaadb6e600a86e54b089d4662d0a464 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

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 fc11e3f0daaadb6e600a86e54b089d4662d0a464, ba3209704b3cd46961e4e081af5c52a780785648, a43a9abc1ebf663f0aa56a729106f68dd9c77da6 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Aug 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 872d26a391da92ed8f0c0f5cb5fef428067b7f30, < fc11e3f0daaadb6e600a86e54b089d4662d0a464	Fixed in fc11e3f0daaadb6e600a86e54b089d4662d0a464
LinuxLinux	Affected ≥ 872d26a391da92ed8f0c0f5cb5fef428067b7f30, < ba3209704b3cd46961e4e081af5c52a780785648	Fixed in ba3209704b3cd46961e4e081af5c52a780785648
LinuxLinux	Affected ≥ 872d26a391da92ed8f0c0f5cb5fef428067b7f30, < a43a9abc1ebf663f0aa56a729106f68dd9c77da6	Fixed in a43a9abc1ebf663f0aa56a729106f68dd9c77da6
LinuxLinux	Affected ≥ 872d26a391da92ed8f0c0f5cb5fef428067b7f30, < 5fbe83a374f09561a0f0c1f4aa021501ffd681eb	Fixed in 5fbe83a374f09561a0f0c1f4aa021501ffd681eb
LinuxLinux	Affected ≥ 872d26a391da92ed8f0c0f5cb5fef428067b7f30, < 4dae393956093c807212918fd91a8fc70df15338	Fixed in 4dae393956093c807212918fd91a8fc70df15338
LinuxLinux	Affected =5.0	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: fix page fragment cache leak in error path In nvmet_tcp_alloc_queue(), when a connection is closed during the allocation process (e.g., nvmet_tcp_set_queue_sock() returns -ENOTCONN), the error handling jumps to out_destroy_sq and then to out_ida_remove without draining the page fragment cache. Although nvmet_tcp_free_cmd() is called in some error paths to release individual page fragments, the underlying page cache reference held by queue->pf_cache is never released. The first allocation using pf_cache is the call to nvmet_tcp_alloc_cmd() for queue->connect, which happens after ida_alloc() returns successfully. This results in a page leak each time a connection fails during allocation, which could lead to memory exhaustion over time if connections are repeatedly opened and closed. Fix this by calling page_frag_cache_drain() before freeing the queue structure in the out_ida_remove label.

References

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