VulnerabilityPublished 7 Nov 2026

CVE-2026-99273: Linux kernel · ksmbd: reserve space for the UTF-16 terminator in stream info

Source GCVE Database

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Authoritative record:CVE-2026-99273· Medium

Not known to be exploited · fixed in a025c4991a7d83edc4dd339e3ea86d8ff6226eca : update Linux kernel when convenient.

Data as of 7 Nov 2026, 16:17 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in a025c4991a7d83edc4dd339e3ea86d8ff6226eca, 7.3.2, 06a751809ebd33e95b05bf733697318a17a4872b +2

Exploitation evidence

Disclosed: evidence found.
CVE published 7 Nov 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 7 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.

ghsa-3jvj-587v-w544

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected <6.18.61 <7.3.2	Fixed in a025c4991a7d83edc4dd339e3ea86d8ff6226eca 7.3.2 06a751809ebd33e95b05bf733697318a17a4872b 6.18.61 0e64f89563164719ceb1aa33f2a8bfd6391fa340

AI-suggested

A fix has been implemented by reserving an extra UTF-16 unit in the allocation size calculations within the Linux kernel ksmbd component. Users should apply the official kernel update that includes this patch to remediate the vulnerability. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's ksmbd component involves insufficient allocation of space for a UTF-16 terminator in stream information. The function smb_strtoUTF16() writes a terminating UTF-16 zero unit after converted characters, but the allocation in get_file_stream_info() does not reserve space for this terminator, causing a buffer overflow by two bytes when the stream entry exactly fills the 448-byte response buffer. The fix involves reserving one extra UTF-16 unit in the allocation checks. The terminator is not part of the wire format, so reported lengths remain unchanged.

References

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