VulnerabilityPublished 17 Sep 2026Updated 19 Oct 2026

CVE-2026-93078: Linux kernel · cxl/features: Reject Set Features output buffer smaller than the header

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in cde18d6c1d913a67ab0afd3d9475ece4be79da50 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in cde18d6c1d913a67ab0afd3d9475ece4be79da50, 1281dc84c81577b51e2b61c24617c9f44b2cdb99, 16b7c99eff030c6ea11ca24efa4b9f989cc74093

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 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 Linux kernel to cde18d6c1d913a67ab0afd3d9475ece4be79da50, 1281dc84c81577b51e2b61c24617c9f44b2cdb99 or 16b7c99eff030c6ea11ca24efa4b9f989cc74093.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ eb5dfcb9e36d0e46089fec777d911313c1876fa3, < cde18d6c1d913a67ab0afd3d9475ece4be79da50	Fixed in cde18d6c1d913a67ab0afd3d9475ece4be79da50
LinuxLinux	Affected ≥ eb5dfcb9e36d0e46089fec777d911313c1876fa3, < 1281dc84c81577b51e2b61c24617c9f44b2cdb99	Fixed in 1281dc84c81577b51e2b61c24617c9f44b2cdb99
LinuxLinux	Affected ≥ eb5dfcb9e36d0e46089fec777d911313c1876fa3, < 16b7c99eff030c6ea11ca24efa4b9f989cc74093	Fixed in 16b7c99eff030c6ea11ca24efa4b9f989cc74093
LinuxLinux	Affected =6.15	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: cxl/features: Reject Set Features output buffer smaller than the header cxlctl_set_feature() sizes its output buffer from the user's fwctl_rpc.out_len but never checks it is large enough to hold even the fwctl_rpc_cxl_out header. With out_len == 0 , kvzalloc() returns ZERO_SIZE_PTR, which passes the !rpc_out check, the subsequent rpc_out->size = 0 then writes through the poison pointer. Reject requests whose output buffer can't hold the response header, before allocating. The Set Feature reply carries no payload, so the header is all that is required.

References

Community reviews

Loading reviews…