CVE-2026-46323

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.

• CWE-416
• CWE-123

• 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/security/cve/CVE-2026-46323Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2479832Third Party Advisory
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.jsonThird Party Advisory

Published

Jun 9, 2026

Last Modified

Aug 7, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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