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.
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < 3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d; >= 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < 1f9c828556416fbe3f49386708ce999fc4d4da06; >= 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < 479084ae0e1d9cb7929cb4298d35623de189f80a; >= 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < e334cbf3388fd9334503a778a82d9e9f14dd2f71; >= 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < 44bea2032af0425e4ce6d26a8af0ede79db49ec1; >= 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < 4db79a322db8c97f7b73b8a347395ef4d685eb40 |
| Linux | Linux | 6.0 |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — |
| Red Hat | Red Hat OpenShift Container Platform 4.17 | — |
| Red Hat | Red Hat OpenShift Container Platform 4.18 | — |
| Red Hat | Red Hat OpenShift Container Platform 4.19 | — |
| Red Hat | Red Hat OpenShift Container Platform 4.20 | — |
| Red Hat | Red Hat OpenShift Container Platform 4.21 | — |
| Red Hat | Red Hat Enterprise Linux 6 | — |
| Red Hat | Red Hat Enterprise Linux 7 | — |
| Red Hat | Red Hat Enterprise Linux 7 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux for NVIDIA 26 | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.7, < * |
References
- https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06Patch
- https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8dPatch
- https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1Patch
- https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80aPatch
- https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40Patch
- https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71Patch
- https://access.redhat.com/errata/RHSA-2026:27708Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27731Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27735Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:36018Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:44230
- https://access.redhat.com/errata/RHSA-2026:44231
- https://access.redhat.com/errata/RHSA-2026:44259
- https://access.redhat.com/errata/RHSA-2026:44262
- https://access.redhat.com/errata/RHSA-2026:44270
- https://access.redhat.com/errata/RHSA-2026:47727
- https://access.redhat.com/errata/RHSA-2026:62639
- https://access.redhat.com/errata/RHSA-2026:62640
- https://access.redhat.com/errata/RHSA-2026:62641
- https://access.redhat.com/errata/RHSA-2026:62642
- https://access.redhat.com/security/cve/CVE-2026-46323Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2479832Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.jsonThird Party Advisory
Timeline
- Published
- Jun 9, 2026
- Last modified
- Nov 10, 2026
- NVD status
- Modified