VulnerabilityPublished 23 Oct 2026

CVE-2026-99045: Linux kernel · ibmveth: h_free logical LAN on open-fail after register

Source GCVE Database

Authoritative record:CVE-2026-99045· Medium

Not known to be exploited · fixed in decb4d4ead2c71ef698727734ab5024a872eb372 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in decb4d4ead2c71ef698727734ab5024a872eb372, d24fdec1413c656d29298097926e77542785ca0c, c54bbdf6f0731102a4bf7f5e4ee535b3ea415996 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 23 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.

ghsa-5hch-2jpc-2mcv

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d43732ce021f4244a4c53a45d57ad0c13c30ed94, < decb4d4ead2c71ef698727734ab5024a872eb372	Fixed in decb4d4ead2c71ef698727734ab5024a872eb372
LinuxLinux	Affected ≥ d43732ce021f4244a4c53a45d57ad0c13c30ed94, < d24fdec1413c656d29298097926e77542785ca0c	Fixed in d24fdec1413c656d29298097926e77542785ca0c
LinuxLinux	Affected ≥ d43732ce021f4244a4c53a45d57ad0c13c30ed94, < c54bbdf6f0731102a4bf7f5e4ee535b3ea415996	Fixed in c54bbdf6f0731102a4bf7f5e4ee535b3ea415996
LinuxLinux	Affected ≥ d43732ce021f4244a4c53a45d57ad0c13c30ed94, < af0524bf4ce1a4cbd2946aa81751582951cfcab5	Fixed in af0524bf4ce1a4cbd2946aa81751582951cfcab5
LinuxLinux	Affected ≥ d43732ce021f4244a4c53a45d57ad0c13c30ed94, < a065bd31ec462f6f9c267026b708dd020f122723	Fixed in a065bd31ec462f6f9c267026b708dd020f122723
LinuxLinux	Affected =4.13	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: ibmveth: h_free logical LAN on open-fail after register ibmveth_open() registers the logical LAN, then allocates the RX buffer pools. A pool failure jumps to out_free_buffer_pools without h_free_logical_lan(), so PHYP still owns the buffer-list page when it is unmapped. request_irq() failure already issued the hypercall before taking the same label. Move that h_free to the shared post-register unwind so both paths deregister before the buffer list is unmapped.

References

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