CVE-2026-46323

net: gro: don't merge zcopy skbs

publishedCWE-123CWE-416

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.

Technical severity7.8 highCVSS 3.1 · CNA: Linux

Published2026-06-09Source updated 2026-11-10

Collected2026-11-102 attributed sources

Fixes and workarounds

Fix

RHSA-2026:47727: Red Hat OpenShift Container Platform 4.17 RHSA-2026:44230: Red Hat OpenShift Container Platform 4.18 RHSA-2026:44231: Red Hat OpenShift Container Platform 4.19 RHSA-2026:44259: Red Hat OpenShift Container Platform 4.20 RHSA-2026:44262: Red Hat OpenShift Container Platform 4.21 RHSA-2026:27731: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) RHSA-2026:44270: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10) RHSA-2026:27735: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4), Red Hat Enterprise Linux Real Time E4S (v.9.4), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) RHSA-2026:27708: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) RHSA-2026:36018: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9) RHSA-2026:62642: Red Hat Enterprise Linux BaseOS (v. 10) RHSA-2026:62639: Red Hat Enterprise Linux BaseOS E4S (v.9.4) RHSA-2026:62641: Red Hat Enterprise Linux BaseOS EUS (v.9.6) RHSA-2026:62640: Red Hat Enterprise Linux BaseOS (v. 9)

Source: ADP: redhat-SADP

Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Source: ADP: redhat-SADP

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Linux Linux	≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc; < 3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d (affected, git) ≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc; < 1f9c828556416fbe3f49386708ce999fc4d4da06 (affected, git) ≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc; < 479084ae0e1d9cb7929cb4298d35623de189f80a (affected, git) ≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc; < e334cbf3388fd9334503a778a82d9e9f14dd2f71 (affected, git) ≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc; < 44bea2032af0425e4ce6d26a8af0ede79db49ec1 (affected, git) ≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc; < 4db79a322db8c97f7b73b8a347395ef4d685eb40 (affected, git) Other versions: unaffected	CNA: Linux
Linux Linux	6.0 (affected) ≥ 0; < 6.0 (unaffected, semver) ≥ 6.1.176; ≤ 6.1.* (unaffected, semver) ≥ 6.6.142; ≤ 6.6.* (unaffected, semver) ≥ 6.12.92; ≤ 6.12.* (unaffected, semver) ≥ 6.18.34; ≤ 6.18.* (unaffected, semver) ≥ 7.0.11; ≤ 7.0.* (unaffected, semver) ≥ 7.1; ≤ * (unaffected, original_commit_for_fix) Other versions: affected	CNA: Linux
Red Hat Enterprise Linux 10 Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	≥ 0:6.12.0-211.38.1.el10_2; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Support Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	≥ 0:6.12.0-55.82.1.el10_0; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9 Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	≥ 0:5.14.0-687.22.1.el9_8; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	≥ 0:5.14.0-427.132.1.el9_4; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	≥ 0:5.14.0-570.123.1.el9_6; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat OpenShift Container Platform 4.17 Red Hat `rhcos` https://access.redhat.com/downloads/content/package-browser/	≥ 417.94.202607240132-0; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat OpenShift Container Platform 4.18 Red Hat `rhcos` https://access.redhat.com/downloads/content/package-browser/	≥ 418.94.202607211754-0; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat OpenShift Container Platform 4.19 Red Hat `rhcos` https://access.redhat.com/downloads/content/package-browser/	≥ 4.19.9.6.202607220857-0; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat OpenShift Container Platform 4.20 Red Hat `rhcos` https://access.redhat.com/downloads/content/package-browser/	≥ 4.20.9.6.202607221038-0; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat OpenShift Container Platform 4.21 Red Hat `rhcos` https://access.redhat.com/downloads/content/package-browser/	≥ 4.21.9.6.202607221317-0; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 6 Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux 7 Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux 7 Red Hat `kernel-rt` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux 8 Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux 8 Red Hat `kernel-rt` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux 9 Red Hat `kernel-rt` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux for NVIDIA 26 Red Hat `kernel` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	ADP: redhat-SADP
Red Hat OpenShift Container Platform 4 Red Hat `openshift/ose-rhel-coreos-8` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	ADP: redhat-SADP
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Siemens	≥ V3.1.6; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Siemens	≥ V3.1.7; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Siemens	≥ V3.1.6; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Siemens	≥ V3.1.7; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Siemens	≥ V3.1.6; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Siemens	≥ V3.1.7; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Siemens	≥ V3.1.6; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Siemens	≥ V3.1.7; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Siemens	≥ V3.1.6; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Siemens	≥ V3.1.7; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 7.8 high	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`	CNA: Linux
3.1 / 7.8 high	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`	ADP: redhat-SADP

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8dCNA: Linux
https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06CNA: Linux
https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80aCNA: Linux
https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71CNA: Linux
https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1CNA: Linux
https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40CNA: Linux
https://access.redhat.com/security/cve/CVE-2026-46323ADP: redhat-SADP · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2479832ADP: redhat-SADP · issue-tracking, x_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.jsonADP: redhat-SADP · x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:47727ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:44230ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:44231ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:44259ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:44262ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27731ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:44270ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27735ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27708ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36018ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:62642ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:62639ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:62641ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:62640ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlADP: siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-457936.htmlADP: siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-784472.htmlADP: siemens-SADP

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