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CVE-2026-98464: In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Synchronize hrtimer callback

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CRITICAL 9.3WATCHLIST

CVE-2026-98464 is a critical-severity flaw (CVSS 9.3) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Synchronize hrtimer callback during teardown The non-Sstc hrtimer callback clears next_set before its final uses of the enclosing vCPU. If teardown observes next_set as false while the callback is still running, kvm_riscv_vcpu_timer_cancel() skips hrtimer_cancel() and kvm_destroy_vcpus() can free the vCPU before the callback enters kvm_riscv_vcpu_set_interrupt().

Why this priority

  • Critical severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score9.3 (Critical)
Attack vectorLocal
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.2% (top 94%)
CISA exploited listNo
Published2026-10-18
Last modified2026-10-24
Publisher (CNA): kernel.org

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

Exact fixes by distribution

Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source
sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310
Fedora 46 · moby-engine · FIXED · 29.9.2-2.fc46 · FEDORA-2026-4856be87b3 · source
sudo dnf upgrade --advisory=FEDORA-2026-4856be87b3
Ubuntu 20.04 · linux · NOT AFFECTED
Ubuntu 22.04 · linux · NOT AFFECTED
Ubuntu 24.04 · linux · NO FIX YET
Ubuntu 20.04 · linux-hwe-5.15 · NOT AFFECTED
Ubuntu 22.04 · linux-hwe-6.8 · NO FIX YET
Debian 12 · linux · FIXED · 6.1.190-1
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.1.190-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · linux · FIXED · 6.12.113-1
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.12.113-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · linux-6.12 · FIXED · 6.12.113-1~deb12u1
sudo apt update && sudo apt install --only-upgrade linux-6.12 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux-6.12)" ge "6.12.113-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · kernel · NOT AFFECTED
RHEL 6 · kernel · NOT AFFECTED
RHEL 7 · kernel · NOT AFFECTED
RHEL 7 · kernel-rt · NOT AFFECTED
RHEL 8 · kernel · NOT AFFECTED
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-98464?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-98464 being exploited?

CVE-2026-98464 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-98464 affect?

CVE-2026-98464 affects affected software. Severity is critical (CVSS 9.3). In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Synchronize hrtimer callback during teardown The non-Sstc hrtimer callback clears next_set before its final uses of the enclosing vCPU. If teardown observes

How urgent is CVE-2026-98464?

Priority 39/100. Critical severity; On your watchlist

Software pages

Linux kernel vulnerabilities

References

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