Kernel-level vulnerability in widely deployed Linux vhost-net (virtualization networking); can disrupt virtual hosts and cloud infrastructure.
CVE-2026-74310
Linux kernel vhost-net use-after-free in zerocopy skb handling.
Is CVE-2026-74310 being exploited?
Not confirmed. CVE-2026-74310 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.14% probability of exploitation in the next 30 days.
How severe is CVE-2026-74310?
CVE-2026-74310 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-74310?
Yes. A fix has been recorded for CVE-2026-74310. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74310 affect?
CVE-2026-74310 affects Linux kernel (vhost-net/virtio zerocopy), KVM/QEMU hosts with vhost-net enabled, Virtualization hosts, cloud VM hosts, network appliances using vhost-net. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74310?
Install vendor kernel patches for vhost-net and reboot affected hosts; disable vhost-net if patching is delayed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Use-after-free in vhost-net zerocopy can cause kernel memory corruption, crashes, and enable privilege escalation or remote code execution.
Immediate action required
- affected>= bab632d69ee48a106e779b60cc01adfe80a72807 and < ea71f873423fb73e66ad88936d6759ac0ad4aa53
- affected>= bab632d69ee48a106e779b60cc01adfe80a72807 and < 6445b945024f4c7675ae5352b2d5885cb1deea71
- affected>= bab632d69ee48a106e779b60cc01adfe80a72807 and < a9f8a1d2e3ff511eafd4c5462481950c2f4d2b5d
- affected>= bab632d69ee48a106e779b60cc01adfe80a72807 and < 321c73baf54d971ce3771fea275c98a247f7ee35
- affected>= bab632d69ee48a106e779b60cc01adfe80a72807 and < c069437924663539a93a1e5afe90838d9ccee284
- affected>= bab632d69ee48a106e779b60cc01adfe80a72807 and < 8f6898fe80794f2d7c3d38c1158c806e4074a1c4
- affected3.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.