Vulnerability · Published Jun 9, 2026 · Assigned by Linux

CVE-2026-46323net: gro: don't merge zcopy skbs

High 7.8

In plain English

A high-severity use-after-free 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 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.1%top 96.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag. When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF. When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10kernel6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-debug5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-debug-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-devel6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-modules6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-modules-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-abi-stablelists6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-abi-stablelists5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-cross-headers6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-cross-headers5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-debug5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-debug-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-devel6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-debug-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-modules6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-debug-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-modules-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-debug-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-devel6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-devel-matched6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-devel-matched5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-doc6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-doc5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-headers6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-headers5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-modules6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-modules-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-modules-extra6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-modules-extra-matched6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:10kernel-rt6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-debug5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-debug-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-devel6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-modules6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-modules-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-tools6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-tools5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-tools-libs6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-tools-libs5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-uki-virt6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-uki-virt5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-zfcpdump5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10libperf6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9libperf5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10perf6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9perf5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10python3-perf6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9python3-perf5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10rtla6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9rtla5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10rv6.12.0-211.38.1.el10_2ALSA-2026:44270
AlmaLinux:9rv5.14.0-687.22.1.el9_8ALSA-2026:36018
Debian:12linux6.1.176-1DEBIAN-CVE-2026-46323
Debian:13linux6.12.94-1DEBIAN-CVE-2026-46323
Debian:14linux7.0.12-1DEBIAN-CVE-2026-46323
Rocky Linux:9kernel0:5.14.0-687.22.1.el9_8RLSA-2026:36018
Ubuntu:24.04:LTSlinux6.8.0-124.124UBUNTU-CVE-2026-46323
Ubuntu:25.10linux6.17.0-35.35UBUNTU-CVE-2026-46323
Ubuntu:26.04:LTSlinux7.0.0-22.22UBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-aws6.8.0-1057.60UBUNTU-CVE-2026-46323
Ubuntu:25.10linux-aws6.17.0-1017.17UBUNTU-CVE-2026-46323
Ubuntu:26.04:LTSlinux-aws7.0.0-1006.6UBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-aws-6.176.17.0-1017.17~24.04.1UBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1057.60~22.04.1UBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-azure6.8.0-1058.64UBUNTU-CVE-2026-46323
Ubuntu:25.10linux-azure6.17.0-1017.17UBUNTU-CVE-2026-46323
Ubuntu:26.04:LTSlinux-azure7.0.0-1007.7USN-8461-1
Ubuntu:26.04:LTSlinux-azure7.0.0-1007.7UBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-azure-6.176.17.0-1017.17~24.04.1UBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1059.65~22.04.1UBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1058.65UBUNTU-CVE-2026-46323
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-46323
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1006.6UBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1058.65~22.04.1UBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-gcp6.8.0-1060.63UBUNTU-CVE-2026-46323
Ubuntu:25.10linux-gcp6.17.0-1018.19UBUNTU-CVE-2026-46323
Ubuntu:26.04:LTSlinux-gcp7.0.0-1005.5UBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-gcp-6.176.17.0-1018.19~24.04.1UBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1060.63~22.04.1UBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-gke6.8.0-1055.61UBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1042.45UBUNTU-CVE-2026-46323
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-46323
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-46323

Affected products (as reported)

VendorProductVersions
Linux Linux 753f1ca4e1e50248a1b760c9774d6d6b354562cc – before 3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d753f1ca4e1e50248a1b760c9774d6d6b354562cc – before 1f9c828556416fbe3f49386708ce999fc4d4da06753f1ca4e1e50248a1b760c9774d6d6b354562cc – before 479084ae0e1d9cb7929cb4298d35623de189f80a753f1ca4e1e50248a1b760c9774d6d6b354562cc – before e334cbf3388fd9334503a778a82d9e9f14dd2f71753f1ca4e1e50248a1b760c9774d6d6b354562cc – before 44bea2032af0425e4ce6d26a8af0ede79db49ec1753f1ca4e1e50248a1b760c9774d6d6b354562cc – before 4db79a322db8c97f7b73b8a347395ef4d685eb40
Linux Linux 6.0

Weakness: CWE-123, CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References