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CVE-2026-64438: In the Linux kernel, the following vulnerability has been resolved: crypto: qat - fix VF2PF work teardown rac

36
Routine
HIGH 8.8WATCHLISTUPGRADE

CVE-2026-64438 is a high-severity flaw (CVSS 8.8) affecting linux kernel. 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: crypto: qat - fix VF2PF work teardown race in adf_disable_sriov() The VF2PF interrupt handler queues PF-side response work that stores a raw pointer to per-VF state (struct adf_accel_vf_info). Currently, adf_disable_sriov() destroys per-VF mutexes and frees vf_info without stopping new VF2PF work or waiting for in-flight workers to complete. A concurrently scheduled or already

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score8.8 (High)
Attack vectorLocal
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.1% (top 97%)
CISA exploited listNo
WeaknessCWE-416
Published2026-07-25
Last modified2026-10-24
Publisher (CNA): kernel.org · Vendor: linux

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

Am I affected?

Timeline

linux linux kernel UPGRADE
Affected: >= 4.3 and < 5.10.261 · >= 5.11 and < 5.15.212 · >= 5.16 and < 6.1.178 · >= 6.2 and < 6.6.145 · >= 6.7 and < 6.12.97 · >= 6.13 and < 6.18.40 · >= 6.19 and < 7.1.4
Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.4
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source
sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0
Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source
sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310
Ubuntu 22.04 · linux · FIXED · 5.15.0-198.208
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "5.15.0-198.208" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 20.04 · linux · NO FIX YET
Ubuntu 24.04 · linux · FIXED · 6.8.0-147.147
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.8.0-147.147" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 20.04 · linux-hwe-5.15 · FIXED · 5.15.0-198.208~20.04.1
sudo apt update && sudo apt install --only-upgrade linux-hwe-5.15 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux-hwe-5.15)" ge "5.15.0-198.208~20.04.1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 22.04 · linux-hwe-6.8 · NO FIX YET
Debian 12 · linux · FIXED · 6.1.180-1
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.1.180-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · linux · FIXED · 6.12.100-1
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.12.100-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · linux-6.12 · FIXED · 6.12.100-1~deb12u1
sudo apt update && sudo apt install --only-upgrade linux-6.12 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux-6.12)" ge "6.12.100-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · kernel · FIXED · kernel-6.12.0-211.50.1.el10_2
sudo dnf upgrade --advisory=RHSA-2026:61887 rpm -q kernel
RHEL 10.0 Extended Update Support · kernel · FIXED · kernel-6.12.0-55.108.1.el10_0
sudo dnf upgrade --advisory=RHSA-2026:75560 rpm -q kernel
RHEL 9 · kernel · FIXED · kernel-5.14.0-687.44.1.el9_8
sudo dnf upgrade --advisory=RHSA-2026:63129 rpm -q kernel
RHEL 9.4 Update Services for SAP Solutions · kernel · FIXED · kernel-5.14.0-427.150.1.el9_4
sudo dnf upgrade --advisory=RHSA-2026:68100 rpm -q kernel
RHEL 9.6 Extended Update Support · kernel · FIXED · kernel-5.14.0-570.141.1.el9_6
sudo dnf upgrade --advisory=RHSA-2026:67720 rpm -q kernel
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-2026-64438?

linux kernel: upgrade to 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.4. Exact commands for each OS are on this page.

Is CVE-2026-64438 being exploited?

CVE-2026-64438 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-2026-64438 affect?

CVE-2026-64438 affects linux kernel. Severity is high (CVSS 8.8). In the Linux kernel, the following vulnerability has been resolved: crypto: qat - fix VF2PF work teardown race in adf_disable_sriov() The VF2PF interrupt handler queues PF-side response work that stores a raw pointer to per-VF state (stru

How urgent is CVE-2026-64438?

Priority 36/100. High severity; On your watchlist

Software pages

Linux kernel vulnerabilities

Related CVEs

References

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