High 7.8Published Jun 9, 2026

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

Updated under an hour ago (Oct 27, 2026, 7:50 AM ET)

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It affects Linux and 11 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-123, CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	753f1ca4e1e50248a1b760c9774d6d6b354562cc builds before 3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d; 753f1ca4e1e50248a1b760c9774d6d6b354562cc builds before 1f9c828556416fbe3f49386708ce999fc4d4da06; from 753f1ca4e1e50248a1b760c9774d6d6b354562cc before 479084ae0e1d9cb7929cb4298d35623de189f80a; from 753f1ca4e1e50248a1b760c9774d6d6b354562cc before e334cbf3388fd9334503a778a82d9e9f14dd2f71; 753f1ca4e1e50248a1b760c9774d6d6b354562cc builds before 44bea2032af0425e4ce6d26a8af0ede79db49ec1; 753f1ca4e1e50248a1b760c9774d6d6b354562cc builds before 4db79a322db8c97f7b73b8a347395ef4d685eb40	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:6.12.0-211.38.1.el10_2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus	from 0:6.12.0-55.82.1.el10_0 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions redhat:rhel_e4s	from 0:5.14.0-427.132.1.el9_4 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus	from 0:5.14.0-570.123.1.el9_6 not affected	CISA ADP
Red Hat Red Hat OpenShift Container Platform 4.17 redhat:openshift	from 417.94.202607240132-0 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux for NVIDIA 26 redhat:enterprise_linux_nvidia	All versions	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
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References

References

https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d	patch
https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06	patch
https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a	patch
https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71	patch
https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1	patch
https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40	patch
https://access.redhat.com/errata/RHSA-2026:27708	third-party-advisory
https://access.redhat.com/errata/RHSA-2026:27731	third-party-advisory
https://access.redhat.com/errata/RHSA-2026:27735	third-party-advisory
https://access.redhat.com/errata/RHSA-2026:36018	third-party-advisory
1–10 of 25

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.