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Vulnerability record · CVE-2026-46323 · published 9 June 2026

CVE-2026-46323: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.20% · top 90.9% CWE-416 · Use after freeCWE-123 · CWE-123
7.8CVSS 3.1 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
24References
8 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06 Patch
https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d Patch
https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1 Patch
https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a Patch
https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40 Patch
https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71 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
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-2026-46323 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2479832 Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.json Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-46323), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.