CVE-2026-98715

KVM: SVM: Preserve TLB control (i.e. pending TLB flush) on failed VMRUN

Products / packages Linux

Published 18/10/2026, 15:46:47 UTC

Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:25:33 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

4 ranges

Linux version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

38e5e92fe8c02a8766459d505423b855caf9af1f → before bfe48e689ba011d3d6cf8adcca03072aa0430133

git versions

38e5e92fe8c02a8766459d505423b855caf9af1f → before f2bd7cf6a83e49c710e2b93d3064fa0ebb7e0006

git versions

38e5e92fe8c02a8766459d505423b855caf9af1f → before fd873c3d1b5240e80365f09e758e8c96b88a7cdb

git versions

38e5e92fe8c02a8766459d505423b855caf9af1f → before 60d93c27859fb3ec5b5a689e24de303f166477d0

git versions

Other versions: unaffected

Linux · Linux

Linux

6 ranges

Linux version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

2.6.38

unaffected

0 → before 2.6.38

semver versions

6.12.117 → through 6.12.*

semver versions

6.18.61 → through 6.18.*

semver versions

7.2.10 → through 7.2.*

semver versions

7.3 → through *

original_commit_for_fix versions

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

In the Linux kernel, the following vulnerability has been resolved:

KVM: SVM: Preserve TLB control (i.e. pending TLB flush) on failed VMRUN

Don't reset the VMCB's TLB control back to "do nothing" on a failed VMRUN, as empirical testing shows that the CPU performs the requested TLB flush if and only if VMRUN is successful, i.e. clearing TLB control on a failed VMRUN effectively drops a TLB flush.

Explicitly track the need to flush all ASIDs on a per-CPU basis, as the ASID reuse condition is tied to the pCPU, not to the vCPU. As a bonus, this also obviates the need to avoid clobbering FLUSH_ALL_ASID with TLB_CONTROL_FLUSH_ASID, e.g. in svm_flush_tlb_asid().

Deliberately don't bother saving/restoring the "old" tlb_ctl on failure, in quotes because it's not exactly the old tlb_ctl, it's the tlb_ctl from after pre_svm_run(), but before updating tlb_ctl for flush_all_asids. If VMRUN fails and TLB_CONTROL_FLUSH_ALL_ASID is forced, then the next successful run of the VMCB may unnecessarily flush all ASIDs, which strictly speaking could result in noisy neighbor issues. However, the fact that new_asid() is already guest-triggerable, because of KVM's flawed behavior of clearing the ASID on emulated INIT, means that a guest can already trigger a flush of all ASIDs at roughly the same rate. And once KVM stops clobbering the ASID on emulated INIT, or assigns a static ASID to each vCPU, this flaw goes away.

References

4 sources

git.kernel.org/stable/c/bfe48e689ba011d3d6cf8adcca03072aa0430133

Source referenceLinux

git.kernel.org/stable/c/f2bd7cf6a83e49c710e2b93d3064fa0ebb7e0006

Source referenceLinux

git.kernel.org/stable/c/fd873c3d1b5240e80365f09e758e8c96b88a7cdb

Source referenceLinux

git.kernel.org/stable/c/60d93c27859fb3ec5b5a689e24de303f166477d0

Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied

Version evidence

Remediation guidance · not supplied

Weakness classification · not supplied

Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-98715

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.38

After:

Through (inclusive):

Before: 6.12.117

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.38

After:

Through (inclusive):

Before: 6.18.61

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.38

After:

Through (inclusive):

Before: 7.2.10

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.38

After:

Through (inclusive):

Before: 7.3

Applicability preview

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Contributing organizations · 1

Linux

Assigning organization

2026-11-10

Timeline

All times UTC

18 Oct 2026, 15:46
Advisory published
Publication date supplied by the source.
10 Nov 2026, 18:15
Source updated
Latest modification date supplied by the source.
10 Nov 2026, 18:25
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

CVE · CVE-2026-987152026-11-10

Observed 2026-11-10T18:25:19.095Z · upstream updated 2026-11-10T18:15:18.805Z

Product or version evidence changed

before

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after

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References changed

before

[
  "https://git.kernel.org/stable/c/f2bd7cf6a83e49c710e2b93d3064fa0ebb7e0006",
  "https://git.kernel.org/stable/c/fd873c3d1b5240e80365f09e758e8c96b88a7cdb",
  "https://git.kernel.org/stable/c/60d93c27859fb3ec5b5a689e24de303f166477d0"
]

after

[
  "https://git.kernel.org/stable/c/bfe48e689ba011d3d6cf8adcca03072aa0430133",
  "https://git.kernel.org/stable/c/f2bd7cf6a83e49c710e2b93d3064fa0ebb7e0006",
  "https://git.kernel.org/stable/c/fd873c3d1b5240e80365f09e758e8c96b88a7cdb",
  "https://git.kernel.org/stable/c/60d93c27859fb3ec5b5a689e24de303f166477d0"
]

Environment requirements changed

before

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after

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]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. No numeric assessment supplied.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: 0.19% estimated probability in the next 30 days. 2026-11-06 · FIRST EPSS.

Record identifiers

Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-98715

Enrichment coverage

NVDAvailable

Checked 07/11/2026, 02:30:43 UTC

GHSAAvailable

Checked 07/11/2026, 02:30:43 UTC

EUVDAvailable

Checked 07/11/2026, 02:30:42 UTC

EPSSAvailable

Checked 07/11/2026, 02:30:42 UTC

Additional source evidence

ENISA EUVD · EUVD-2026-103969Checked 07/11/2026, 02:30:42 UTC

FIRST EPSS · CVE-2026-98715

EPSS 0.19% probability of exploitation in the next 30 days. Percentile: 8.62% · 2026-11-06

Checked 07/11/2026, 02:30:42 UTC

NVD · CVE-2026-98715Checked 07/11/2026, 02:30:43 UTC

GitHub Advisory Database · GHSA-j396-gv6v-75wxChecked 07/11/2026, 02:30:43 UTC

Sponsored by MoxsoBuild security habits with adaptive training and phishing simulations.View as JSON

KVM: SVM: Preserve TLB control (i.e. pending TLB flush) on failed VMRUN

Severity and exploitation

What this means

Attack conditions

Affected versions

Linux

affected

unaffected

unknown

Linux

affected

unaffected

unknown

What to do

Public exploit evidence

Original source description

References

Inside the record

Evidence available

Original records

Environment requirements

Timeline

Advisory published

Source updated

Last imported by cve.new

What changed