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Vulnerability · Published Jun 24, 2026 · Assigned by Linux

CVE-2026-52994vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.1%top 97.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting virtio_transport_init_zcopy_skb() uses iter->count as the size argument for msg_zerocopy_realloc(), which in turn passes it to mm_account_pinned_pages() for RLIMIT_MEMLOCK accounting. However, this function is called after virtio_transport_fill_skb() has already consumed the iterator via __zerocopy_sg_from_iter(), so on the last skb, iter->count will be 0, skipping the RLIMIT_MEMLOCK enforcement. Pass pkt_len (the total bytes being sent) as an explicit parameter to virtio_transport_init_zcopy_skb() instead of reading the already-consumed iter->count. This matches TCP and UDP, which both call msg_zerocopy_realloc() with the original message size.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13linuxno fix listedDEBIAN-CVE-2026-52994
Debian:14linux7.0.10-1DEBIAN-CVE-2026-52994
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-52994
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux7.0.0-28.28UBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-52994
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-aws7.0.0-1009.9UBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-52994
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-azure7.0.0-1010.10UBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-52994
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1009.9UBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-52994
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-gcp7.0.0-1008.8UBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-gke7.0.0-1003.4UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-28.28~24.04.1UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-ibm7.0.0-1010.10UBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-nvidia7.0.0-1016.16UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-nvidia-7.07.0.0-1016.16~24.04.1UBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-nvidia-bos7.0.0-2016.16UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1036.39UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1036.39USN-8886-1
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1009.9UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-52994
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-oracle7.0.0-1008.8UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-oracle-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-52994
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-raspi7.0.0-1015.15UBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-52994
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-realtime7.0.0-28.28.1UBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-52994
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-52994
Ubuntu:26.04:LTSlinux-riscv7.0.0-28.28.1UBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-28.28.1~24.04.3UBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-52994
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-52994
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-52994

Affected products (as reported)

VendorProductVersions
Linux Linux 581512a6dc939ef122e49336626ae159f3b8a345 – before 6af1736b5810bc8a4a43a8518530113f5a757dc1581512a6dc939ef122e49336626ae159f3b8a345 – before d0117950075f0a9d5944980784c719d8ebcd4bff581512a6dc939ef122e49336626ae159f3b8a345 – before 1cb36e252211506f51095fe7ced8286cc77b4c80
Linux Linux 6.7

References