VulnerabilityPublished 18 Oct 2026

CVE-2026-98715: Linux kernel · KVM: SVM: Preserve TLB control (i.e. pending TLB flush) on failed VMRUN

Source GCVE Database

Authoritative record:CVE-2026-98715· Medium

Not known to be exploited : upgrade to fd873c3d1b5240e80365f09e758e8c96b88a7cdb or 60d93c27859fb3ec5b5a689e24de303f166477d0 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 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in fd873c3d1b5240e80365f09e758e8c96b88a7cdb, 60d93c27859fb3ec5b5a689e24de303f166477d0

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.

ghsa-j396-gv6v-75wx

What to do

Upgrade Linux kernel to fd873c3d1b5240e80365f09e758e8c96b88a7cdb or 60d93c27859fb3ec5b5a689e24de303f166477d0.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 38e5e92fe8c02a8766459d505423b855caf9af1f, < fd873c3d1b5240e80365f09e758e8c96b88a7cdb	Fixed in fd873c3d1b5240e80365f09e758e8c96b88a7cdb
LinuxLinux	Affected ≥ 38e5e92fe8c02a8766459d505423b855caf9af1f, < 60d93c27859fb3ec5b5a689e24de303f166477d0	Fixed in 60d93c27859fb3ec5b5a689e24de303f166477d0
LinuxLinux	Affected =2.6.38	Fixed in–
Debiandebian/linux`pkg:deb/debian/linux`Other threats	Affected =2.6.38	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

The vulnerability has been resolved in the Linux kernel. Users should apply the official kernel updates that include this fix. Since this is a kernel-level fix, upgrading to the patched kernel version is the recommended remediation. No additional mitigation steps are indicated or required beyond applying the official fix.

Description

A vulnerability in the Linux kernel's KVM SVM implementation related to TLB control on failed VMRUN operations has been resolved. The issue involved improperly resetting the VMCB's TLB control state on a failed VMRUN, which could cause a requested TLB flush to be dropped. The fix involves preserving TLB control state and explicitly tracking the need to flush all ASIDs on a per-CPU basis. This correction prevents potential noisy neighbor issues caused by unnecessary flushing of all ASIDs after a failed VMRUN. The vulnerability is addressed by changes in the kernel code behavior and does not have known exploits in the wild.

Impact

The vulnerability could lead to dropped TLB flushes on failed VMRUN operations, potentially causing stale TLB entries to persist. This might result in noisy neighbor effects due to unnecessary flushing of all ASIDs on subsequent successful runs, which could degrade performance. However, the impact is limited to the internal handling of TLB flushes within the KVM SVM virtualization context and does not indicate direct security compromise or known exploitation. No known exploits in the wild have been reported.

References

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