VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98450: Linux kernel · smb: client: close completed creates on compound wait errors

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 253612499ce9b4cd7bb922fe507ec204bddd9313 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 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 253612499ce9b4cd7bb922fe507ec204bddd9313, 224b56b7c02b2bfb1f5bee18d5f56ae6b052be44, 8afc80156b1d9e2cfd02d42c255305fad95b59fc +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 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 ≥ e0bba0b8548179b696e86c158ea8f45f2ef6ad14, < 253612499ce9b4cd7bb922fe507ec204bddd9313	Fixed in 253612499ce9b4cd7bb922fe507ec204bddd9313
LinuxLinux	Affected ≥ e0bba0b8548179b696e86c158ea8f45f2ef6ad14, < 224b56b7c02b2bfb1f5bee18d5f56ae6b052be44	Fixed in 224b56b7c02b2bfb1f5bee18d5f56ae6b052be44
LinuxLinux	Affected ≥ e0bba0b8548179b696e86c158ea8f45f2ef6ad14, < 8afc80156b1d9e2cfd02d42c255305fad95b59fc	Fixed in 8afc80156b1d9e2cfd02d42c255305fad95b59fc
LinuxLinux	Affected ≥ e0bba0b8548179b696e86c158ea8f45f2ef6ad14, < 6c5c547f037bc18f0b8d0b5db5a648f8f630ce85	Fixed in 6c5c547f037bc18f0b8d0b5db5a648f8f630ce85
LinuxLinux	Affected ≥ e0bba0b8548179b696e86c158ea8f45f2ef6ad14, < 2cb07d1a6a30283dbfc809c8036bc1fd103d59fa	Fixed in 2cb07d1a6a30283dbfc809c8036bc1fd103d59fa
LinuxLinux	Affected =4.19	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: close completed creates on compound wait errors compound_send_recv() waits for responses in order. If a later wait is interrupted, or if a later MID fails during response synchronization, an earlier CREATE may already have opened a remote handle. The earlier mid is then released without invoking handle_cancelled_mid(), leaving the remote handle open because no FID was copied to the caller. Mark completed earlier mids as cancelled when a compound wait or MID synchronization aborts. Keep their response buffers attached while the MIDs are synchronized, and transfer them only after synchronization of the processed responses, so the release path can inspect successful CREATE responses and queue SMB2_close() after a later failure. Account for a remote open only after the close work is allocated and before it is queued, since the caller has not yet updated num_remote_opens. Mark the create+close compound used by smb2_unlink() so it is not closed again. Non-CREATE responses and compounds that already include a close keep their existing behavior.

References

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