VulnerabilityPublished 17 Sep 2026Updated 19 Oct 2026

CVE-2026-93096: Linux kernel · cxl/features: Serialize multi-part Get/Set Feature transfers

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in c6492e17412048387435f256ffafc4dd6518db28 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 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 c6492e17412048387435f256ffafc4dd6518db28, 7682b617db1f19bc606b5f1badadcf1e63a87b14, 77b814c1832fde018c30357b4ec3fcdaa91a1c10

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 c6492e17412048387435f256ffafc4dd6518db28, 7682b617db1f19bc606b5f1badadcf1e63a87b14 or 77b814c1832fde018c30357b4ec3fcdaa91a1c10.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5e5ac21f629de796ab5d598b59c5e468c6fe4f95, < c6492e17412048387435f256ffafc4dd6518db28	Fixed in c6492e17412048387435f256ffafc4dd6518db28
LinuxLinux	Affected ≥ 5e5ac21f629de796ab5d598b59c5e468c6fe4f95, < 7682b617db1f19bc606b5f1badadcf1e63a87b14	Fixed in 7682b617db1f19bc606b5f1badadcf1e63a87b14
LinuxLinux	Affected ≥ 5e5ac21f629de796ab5d598b59c5e468c6fe4f95, < 77b814c1832fde018c30357b4ec3fcdaa91a1c10	Fixed in 77b814c1832fde018c30357b4ec3fcdaa91a1c10
LinuxLinux	Affected =6.15	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: cxl/features: Serialize multi-part Get/Set Feature transfers A Get or Set Feature payload larger than the mailbox payload size is split into several mailbox commands. mbox_mutex only serializes individual mailbox commands and is dropped between iterations of these loops. Nothing serializes the multi-part transfer as a whole. cxl_get_feature() and cxl_set_feature() are reachable concurrently from fwctl (per-fd RPCs run under a read-held registration lock) and from the EDAC scrub/ECS/repair paths, so two transfers to the same mailbox can interleave their parts and corrupt the device's transfer context. Add a per-mailbox feat_mutex and hold it across the whole transfer in both functions. It nests outside mbox_mutex (which is taken inside cxl_internal_send_cmd()), and is taken nowhere else, so no lock-ordering inversion is introduced.

References

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