CVE-2026-46323

HIGH

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 v3.1 Score

7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Published: 6/9/2026Modified: 10/19/2026

Related Intelligence (1)

CRITICALVulnerability

Siemens SIMATIC S7-1500 TM MFP

<p><a href="https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-295-16.json"><strong>View CSAF</strong></a></p> <h2>Summary</h2> <p><strong>Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP V1.1.1. Siemens is preparing fixes and recommends specific mitigations for products where fixes are not or not yet avail

CVE-2023-52927CVE-2023-53292
CISA Advisories

References (26)

https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06Patchhttps://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8dPatchhttps://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1Patchhttps://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80aPatchhttps://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40Patchhttps://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71Patchhttps://access.redhat.com/errata/RHSA-2026:27708Third Party Advisoryhttps://access.redhat.com/errata/RHSA-2026:27731Third Party Advisoryhttps://access.redhat.com/errata/RHSA-2026:27735Third Party Advisoryhttps://access.redhat.com/errata/RHSA-2026:36018Third Party Advisoryhttps://access.redhat.com/errata/RHSA-2026:44230https://access.redhat.com/errata/RHSA-2026:44231https://access.redhat.com/errata/RHSA-2026:44259https://access.redhat.com/errata/RHSA-2026:44262https://access.redhat.com/errata/RHSA-2026:44270https://access.redhat.com/errata/RHSA-2026:47727https://access.redhat.com/errata/RHSA-2026:62639https://access.redhat.com/errata/RHSA-2026:62640https://access.redhat.com/errata/RHSA-2026:62641https://access.redhat.com/errata/RHSA-2026:62642https://access.redhat.com/security/cve/CVE-2026-46323Third Party Advisoryhttps://bugzilla.redhat.com/show_bug.cgi?id=2479832Third Party Advisoryhttps://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-457936.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-784472.htmlhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.jsonThird Party Advisory